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postgres/src/backend/utils/misc/guc.c
Tom Lane 4605d1c98b Allow loadable modules to create PGC_POSTMASTER GUC variables, but only 
when loaded via shared_preload_libraries.  Needed for support of
pg_stat_statements, or pretty much anything else that wants a GUC to
control size of a shared memory allocation.
2009-01-03 20:03:08 +00:00

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/*--------------------------------------------------------------------
* guc.c
*
* Support for grand unified configuration scheme, including SET
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
*
* Copyright (c) 2000-2009, PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.488 2009/01/03 20:03:08 tgl Exp $
*
*--------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include <float.h>
#include <limits.h>
#include <unistd.h>
#include <sys/stat.h>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif
#include "access/gin.h"
#include "access/transam.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "catalog/namespace.h"
#include "commands/async.h"
#include "commands/prepare.h"
#include "commands/vacuum.h"
#include "commands/variable.h"
#include "commands/trigger.h"
#include "funcapi.h"
#include "libpq/auth.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/paths.h"
#include "optimizer/planmain.h"
#include "parser/gramparse.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/parse_type.h"
#include "parser/scansup.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
#include "postmaster/bgwriter.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
#include "postmaster/walwriter.h"
#include "regex/regex.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "tcop/tcopprot.h"
#include "tsearch/ts_cache.h"
#include "utils/builtins.h"
#include "utils/guc_tables.h"
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#include "utils/plancache.h"
#include "utils/portal.h"
#include "utils/ps_status.h"
#include "utils/tzparser.h"
#include "utils/xml.h"
#ifndef PG_KRB_SRVTAB
#define PG_KRB_SRVTAB ""
#endif
#ifndef PG_KRB_SRVNAM
#define PG_KRB_SRVNAM ""
#endif
#define CONFIG_FILENAME "postgresql.conf"
#define HBA_FILENAME "pg_hba.conf"
#define IDENT_FILENAME "pg_ident.conf"
#ifdef EXEC_BACKEND
#define CONFIG_EXEC_PARAMS "global/config_exec_params"
#define CONFIG_EXEC_PARAMS_NEW "global/config_exec_params.new"
#endif
/* upper limit for GUC variables measured in kilobytes of memory */
#if SIZEOF_SIZE_T > 4
#define MAX_KILOBYTES INT_MAX
#else
#define MAX_KILOBYTES (INT_MAX / 1024)
#endif
#define KB_PER_MB (1024)
#define KB_PER_GB (1024*1024)
#define MS_PER_S 1000
#define S_PER_MIN 60
#define MS_PER_MIN (1000 * 60)
#define MIN_PER_H 60
#define S_PER_H (60 * 60)
#define MS_PER_H (1000 * 60 * 60)
#define MIN_PER_D (60 * 24)
#define S_PER_D (60 * 60 * 24)
#define MS_PER_D (1000 * 60 * 60 * 24)
/* XXX these should appear in other modules' header files */
extern bool Log_disconnections;
extern int CommitDelay;
extern int CommitSiblings;
extern char *default_tablespace;
extern char *temp_tablespaces;
extern bool synchronize_seqscans;
extern bool fullPageWrites;
#ifdef TRACE_SORT
extern bool trace_sort;
#endif
#ifdef TRACE_SYNCSCAN
extern bool trace_syncscan;
#endif
#ifdef DEBUG_BOUNDED_SORT
extern bool optimize_bounded_sort;
#endif
#ifdef USE_SSL
extern char *SSLCipherSuites;
#endif
static void set_config_sourcefile(const char *name, char *sourcefile,
int sourceline);
static const char *assign_log_destination(const char *value,
bool doit, GucSource source);
#ifdef HAVE_SYSLOG
static int syslog_facility = LOG_LOCAL0;
static bool assign_syslog_facility(int newval,
bool doit, GucSource source);
static const char *assign_syslog_ident(const char *ident,
bool doit, GucSource source);
#endif
static bool assign_session_replication_role(int newval, bool doit,
GucSource source);
static const char *show_num_temp_buffers(void);
static bool assign_phony_autocommit(bool newval, bool doit, GucSource source);
static const char *assign_custom_variable_classes(const char *newval, bool doit,
GucSource source);
static bool assign_debug_assertions(bool newval, bool doit, GucSource source);
static bool assign_ssl(bool newval, bool doit, GucSource source);
static bool assign_stage_log_stats(bool newval, bool doit, GucSource source);
static bool assign_log_stats(bool newval, bool doit, GucSource source);
static bool assign_transaction_read_only(bool newval, bool doit, GucSource source);
static const char *assign_canonical_path(const char *newval, bool doit, GucSource source);
static const char *assign_timezone_abbreviations(const char *newval, bool doit, GucSource source);
static const char *show_archive_command(void);
static bool assign_tcp_keepalives_idle(int newval, bool doit, GucSource source);
static bool assign_tcp_keepalives_interval(int newval, bool doit, GucSource source);
static bool assign_tcp_keepalives_count(int newval, bool doit, GucSource source);
static const char *show_tcp_keepalives_idle(void);
static const char *show_tcp_keepalives_interval(void);
static const char *show_tcp_keepalives_count(void);
static bool assign_autovacuum_max_workers(int newval, bool doit, GucSource source);
static bool assign_maxconnections(int newval, bool doit, GucSource source);
static const char *assign_pgstat_temp_directory(const char *newval, bool doit, GucSource source);
static char *config_enum_get_options(struct config_enum *record,
const char *prefix, const char *suffix,
const char *separator);
/*
* Options for enum values defined in this module.
*
* NOTE! Option values may not contain double quotes!
*/
/*
* We have different sets for client and server message level options because
* they sort slightly different (see "log" level)
*/
static const struct config_enum_entry client_message_level_options[] = {
{"debug", DEBUG2, true},
{"debug5", DEBUG5, false},
{"debug4", DEBUG4, false},
{"debug3", DEBUG3, false},
{"debug2", DEBUG2, false},
{"debug1", DEBUG1, false},
{"log", LOG, false},
{"info", INFO, true},
{"notice", NOTICE, false},
{"warning", WARNING, false},
{"error", ERROR, false},
{"fatal", FATAL, true},
{"panic", PANIC, true},
{NULL, 0, false}
};
static const struct config_enum_entry server_message_level_options[] = {
{"debug", DEBUG2, true},
{"debug5", DEBUG5, false},
{"debug4", DEBUG4, false},
{"debug3", DEBUG3, false},
{"debug2", DEBUG2, false},
{"debug1", DEBUG1, false},
{"info", INFO, false},
{"notice", NOTICE, false},
{"warning", WARNING, false},
{"error", ERROR, false},
{"log", LOG, false},
{"fatal", FATAL, false},
{"panic", PANIC, false},
{NULL, 0, false}
};
static const struct config_enum_entry intervalstyle_options[] = {
{"postgres", INTSTYLE_POSTGRES, false},
{"postgres_verbose", INTSTYLE_POSTGRES_VERBOSE, false},
{"sql_standard", INTSTYLE_SQL_STANDARD, false},
{"iso_8601", INTSTYLE_ISO_8601, false},
{NULL, 0, false}
};
static const struct config_enum_entry log_error_verbosity_options[] = {
{"terse", PGERROR_TERSE, false},
{"default", PGERROR_DEFAULT, false},
{"verbose", PGERROR_VERBOSE, false},
{NULL, 0, false}
};
static const struct config_enum_entry log_statement_options[] = {
{"none", LOGSTMT_NONE, false},
{"ddl", LOGSTMT_DDL, false},
{"mod", LOGSTMT_MOD, false},
{"all", LOGSTMT_ALL, false},
{NULL, 0, false}
};
static const struct config_enum_entry regex_flavor_options[] = {
{"advanced", REG_ADVANCED, false},
{"extended", REG_EXTENDED, false},
{"basic", REG_BASIC, false},
{NULL, 0, false}
};
static const struct config_enum_entry isolation_level_options[] = {
{"serializable", XACT_SERIALIZABLE, false},
{"repeatable read", XACT_REPEATABLE_READ, false},
{"read committed", XACT_READ_COMMITTED, false},
{"read uncommitted", XACT_READ_UNCOMMITTED, false},
{NULL, 0}
};
static const struct config_enum_entry session_replication_role_options[] = {
{"origin", SESSION_REPLICATION_ROLE_ORIGIN, false},
{"replica", SESSION_REPLICATION_ROLE_REPLICA, false},
{"local", SESSION_REPLICATION_ROLE_LOCAL, false},
{NULL, 0, false}
};
#ifdef HAVE_SYSLOG
static const struct config_enum_entry syslog_facility_options[] = {
{"local0", LOG_LOCAL0, false},
{"local1", LOG_LOCAL1, false},
{"local2", LOG_LOCAL2, false},
{"local3", LOG_LOCAL3, false},
{"local4", LOG_LOCAL4, false},
{"local5", LOG_LOCAL5, false},
{"local6", LOG_LOCAL6, false},
{"local7", LOG_LOCAL7, false},
{NULL, 0}
};
#endif
static const struct config_enum_entry track_function_options[] = {
{"none", TRACK_FUNC_OFF, false},
{"pl", TRACK_FUNC_PL, false},
{"all", TRACK_FUNC_ALL, false},
{NULL, 0, false}
};
static const struct config_enum_entry xmlbinary_options[] = {
{"base64", XMLBINARY_BASE64, false},
{"hex", XMLBINARY_HEX, false},
{NULL, 0, false}
};
static const struct config_enum_entry xmloption_options[] = {
{"content", XMLOPTION_CONTENT, false},
{"document", XMLOPTION_DOCUMENT, false},
{NULL, 0, false}
};
/*
* Although only "on", "off", and "safe_encoding" are documented, we
* accept all the likely variants of "on" and "off".
*/
static const struct config_enum_entry backslash_quote_options[] = {
{"safe_encoding", BACKSLASH_QUOTE_SAFE_ENCODING, false},
{"on", BACKSLASH_QUOTE_ON, false},
{"off", BACKSLASH_QUOTE_OFF, false},
{"true", BACKSLASH_QUOTE_ON, true},
{"false", BACKSLASH_QUOTE_OFF, true},
{"yes", BACKSLASH_QUOTE_ON, true},
{"no", BACKSLASH_QUOTE_OFF, true},
{"1", BACKSLASH_QUOTE_ON, true},
{"0", BACKSLASH_QUOTE_OFF, true},
{NULL, 0, false}
};
/*
* Options for enum values stored in other modules
*/
extern const struct config_enum_entry sync_method_options[];
/*
* GUC option variables that are exported from this module
*/
#ifdef USE_ASSERT_CHECKING
bool assert_enabled = true;
#else
bool assert_enabled = false;
#endif
bool log_duration = false;
bool Debug_print_plan = false;
bool Debug_print_parse = false;
bool Debug_print_rewritten = false;
bool Debug_pretty_print = true;
bool log_parser_stats = false;
bool log_planner_stats = false;
bool log_executor_stats = false;
bool log_statement_stats = false; /* this is sort of all three
* above together */
bool log_btree_build_stats = false;
bool check_function_bodies = true;
bool default_with_oids = false;
bool SQL_inheritance = true;
bool Password_encryption = true;
int log_min_error_statement = ERROR;
int log_min_messages = WARNING;
int client_min_messages = NOTICE;
int log_min_duration_statement = -1;
int log_temp_files = -1;
int num_temp_buffers = 1000;
char *ConfigFileName;
char *HbaFileName;
char *IdentFileName;
char *external_pid_file;
char *pgstat_temp_directory;
int tcp_keepalives_idle;
int tcp_keepalives_interval;
int tcp_keepalives_count;
/*
* These variables are all dummies that don't do anything, except in some
* cases provide the value for SHOW to display. The real state is elsewhere
* and is kept in sync by assign_hooks.
*/
static char *log_destination_string;
#ifdef HAVE_SYSLOG
static char *syslog_ident_str;
#endif
static bool phony_autocommit;
static bool session_auth_is_superuser;
static double phony_random_seed;
static char *client_encoding_string;
static char *datestyle_string;
static char *locale_collate;
static char *locale_ctype;
static char *server_encoding_string;
static char *server_version_string;
static int server_version_num;
static char *timezone_string;
static char *log_timezone_string;
static char *timezone_abbreviations_string;
static char *XactIsoLevel_string;
static char *data_directory;
static char *custom_variable_classes;
static int max_function_args;
static int max_index_keys;
static int max_identifier_length;
static int block_size;
static int segment_size;
static int wal_block_size;
static int wal_segment_size;
static bool integer_datetimes;
/* should be static, but commands/variable.c needs to get at these */
char *role_string;
char *session_authorization_string;
/*
* Displayable names for context types (enum GucContext)
*
* Note: these strings are deliberately not localized.
*/
const char *const GucContext_Names[] =
{
/* PGC_INTERNAL */ "internal",
/* PGC_POSTMASTER */ "postmaster",
/* PGC_SIGHUP */ "sighup",
/* PGC_BACKEND */ "backend",
/* PGC_SUSET */ "superuser",
/* PGC_USERSET */ "user"
};
/*
* Displayable names for source types (enum GucSource)
*
* Note: these strings are deliberately not localized.
*/
const char *const GucSource_Names[] =
{
/* PGC_S_DEFAULT */ "default",
/* PGC_S_ENV_VAR */ "environment variable",
/* PGC_S_FILE */ "configuration file",
/* PGC_S_ARGV */ "command line",
/* PGC_S_DATABASE */ "database",
/* PGC_S_USER */ "user",
/* PGC_S_CLIENT */ "client",
/* PGC_S_OVERRIDE */ "override",
/* PGC_S_INTERACTIVE */ "interactive",
/* PGC_S_TEST */ "test",
/* PGC_S_SESSION */ "session"
};
/*
* Displayable names for the groupings defined in enum config_group
*/
const char *const config_group_names[] =
{
/* UNGROUPED */
gettext_noop("Ungrouped"),
/* FILE_LOCATIONS */
gettext_noop("File Locations"),
/* CONN_AUTH */
gettext_noop("Connections and Authentication"),
/* CONN_AUTH_SETTINGS */
gettext_noop("Connections and Authentication / Connection Settings"),
/* CONN_AUTH_SECURITY */
gettext_noop("Connections and Authentication / Security and Authentication"),
/* RESOURCES */
gettext_noop("Resource Usage"),
/* RESOURCES_MEM */
gettext_noop("Resource Usage / Memory"),
/* RESOURCES_KERNEL */
gettext_noop("Resource Usage / Kernel Resources"),
/* WAL */
gettext_noop("Write-Ahead Log"),
/* WAL_SETTINGS */
gettext_noop("Write-Ahead Log / Settings"),
/* WAL_CHECKPOINTS */
gettext_noop("Write-Ahead Log / Checkpoints"),
/* QUERY_TUNING */
gettext_noop("Query Tuning"),
/* QUERY_TUNING_METHOD */
gettext_noop("Query Tuning / Planner Method Configuration"),
/* QUERY_TUNING_COST */
gettext_noop("Query Tuning / Planner Cost Constants"),
/* QUERY_TUNING_GEQO */
gettext_noop("Query Tuning / Genetic Query Optimizer"),
/* QUERY_TUNING_OTHER */
gettext_noop("Query Tuning / Other Planner Options"),
/* LOGGING */
gettext_noop("Reporting and Logging"),
/* LOGGING_WHERE */
gettext_noop("Reporting and Logging / Where to Log"),
/* LOGGING_WHEN */
gettext_noop("Reporting and Logging / When to Log"),
/* LOGGING_WHAT */
gettext_noop("Reporting and Logging / What to Log"),
/* STATS */
gettext_noop("Statistics"),
/* STATS_MONITORING */
gettext_noop("Statistics / Monitoring"),
/* STATS_COLLECTOR */
gettext_noop("Statistics / Query and Index Statistics Collector"),
/* AUTOVACUUM */
gettext_noop("Autovacuum"),
/* CLIENT_CONN */
gettext_noop("Client Connection Defaults"),
/* CLIENT_CONN_STATEMENT */
gettext_noop("Client Connection Defaults / Statement Behavior"),
/* CLIENT_CONN_LOCALE */
gettext_noop("Client Connection Defaults / Locale and Formatting"),
/* CLIENT_CONN_OTHER */
gettext_noop("Client Connection Defaults / Other Defaults"),
/* LOCK_MANAGEMENT */
gettext_noop("Lock Management"),
/* COMPAT_OPTIONS */
gettext_noop("Version and Platform Compatibility"),
/* COMPAT_OPTIONS_PREVIOUS */
gettext_noop("Version and Platform Compatibility / Previous PostgreSQL Versions"),
/* COMPAT_OPTIONS_CLIENT */
gettext_noop("Version and Platform Compatibility / Other Platforms and Clients"),
/* PRESET_OPTIONS */
gettext_noop("Preset Options"),
/* CUSTOM_OPTIONS */
gettext_noop("Customized Options"),
/* DEVELOPER_OPTIONS */
gettext_noop("Developer Options"),
/* help_config wants this array to be null-terminated */
NULL
};
/*
* Displayable names for GUC variable types (enum config_type)
*
* Note: these strings are deliberately not localized.
*/
const char *const config_type_names[] =
{
/* PGC_BOOL */ "bool",
/* PGC_INT */ "integer",
/* PGC_REAL */ "real",
/* PGC_STRING */ "string",
/* PGC_ENUM */ "enum"
};
/*
* Contents of GUC tables
*
* See src/backend/utils/misc/README for design notes.
*
* TO ADD AN OPTION:
*
* 1. Declare a global variable of type bool, int, double, or char*
* and make use of it.
*
* 2. Decide at what times it's safe to set the option. See guc.h for
* details.
*
* 3. Decide on a name, a default value, upper and lower bounds (if
* applicable), etc.
*
* 4. Add a record below.
*
* 5. Add it to src/backend/utils/misc/postgresql.conf.sample, if
* appropriate.
*
* 6. Don't forget to document the option (at least in config.sgml).
*
* 7. If it's a new GUC_LIST option you must edit pg_dumpall.c to ensure
* it is not single quoted at dump time.
*/
/******** option records follow ********/
static struct config_bool ConfigureNamesBool[] =
{
{
{"enable_seqscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of sequential-scan plans."),
NULL
},
&enable_seqscan,
true, NULL, NULL
},
{
{"enable_indexscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of index-scan plans."),
NULL
},
&enable_indexscan,
true, NULL, NULL
},
{
{"enable_bitmapscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of bitmap-scan plans."),
NULL
},
&enable_bitmapscan,
true, NULL, NULL
},
{
{"enable_tidscan", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of TID scan plans."),
NULL
},
&enable_tidscan,
true, NULL, NULL
},
{
{"enable_sort", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of explicit sort steps."),
NULL
},
&enable_sort,
true, NULL, NULL
},
{
{"enable_hashagg", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of hashed aggregation plans."),
NULL
},
&enable_hashagg,
true, NULL, NULL
},
{
{"enable_nestloop", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of nested-loop join plans."),
NULL
},
&enable_nestloop,
true, NULL, NULL
},
{
{"enable_mergejoin", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of merge join plans."),
NULL
},
&enable_mergejoin,
true, NULL, NULL
},
{
{"enable_hashjoin", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enables the planner's use of hash join plans."),
NULL
},
&enable_hashjoin,
true, NULL, NULL
},
{
{"constraint_exclusion", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Enables the planner to use constraints to optimize queries."),
gettext_noop("Child table scans will be skipped if their "
"constraints guarantee that no rows match the query.")
},
&constraint_exclusion,
false, NULL, NULL
},
{
{"geqo", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("Enables genetic query optimization."),
gettext_noop("This algorithm attempts to do planning without "
"exhaustive searching.")
},
&enable_geqo,
true, NULL, NULL
},
{
/* Not for general use --- used by SET SESSION AUTHORIZATION */
{"is_superuser", PGC_INTERNAL, UNGROUPED,
gettext_noop("Shows whether the current user is a superuser."),
NULL,
GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&session_auth_is_superuser,
false, NULL, NULL
},
{
{"ssl", PGC_POSTMASTER, CONN_AUTH_SECURITY,
gettext_noop("Enables SSL connections."),
NULL
},
&EnableSSL,
false, assign_ssl, NULL
},
{
{"fsync", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Forces synchronization of updates to disk."),
gettext_noop("The server will use the fsync() system call in several places to make "
"sure that updates are physically written to disk. This insures "
"that a database cluster will recover to a consistent state after "
"an operating system or hardware crash.")
},
&enableFsync,
true, NULL, NULL
},
{
{"synchronous_commit", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets immediate fsync at commit."),
NULL
},
&XactSyncCommit,
true, NULL, NULL
},
{
{"zero_damaged_pages", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("Continues processing past damaged page headers."),
gettext_noop("Detection of a damaged page header normally causes PostgreSQL to "
"report an error, aborting the current transaction. Setting "
"zero_damaged_pages to true causes the system to instead report a "
"warning, zero out the damaged page, and continue processing. This "
"behavior will destroy data, namely all the rows on the damaged page."),
GUC_NOT_IN_SAMPLE
},
&zero_damaged_pages,
false, NULL, NULL
},
{
{"full_page_writes", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Writes full pages to WAL when first modified after a checkpoint."),
gettext_noop("A page write in process during an operating system crash might be "
"only partially written to disk. During recovery, the row changes "
"stored in WAL are not enough to recover. This option writes "
"pages when first modified after a checkpoint to WAL so full recovery "
"is possible.")
},
&fullPageWrites,
true, NULL, NULL
},
{
{"silent_mode", PGC_POSTMASTER, LOGGING_WHEN,
gettext_noop("Runs the server silently."),
gettext_noop("If this parameter is set, the server will automatically run in the "
"background and any controlling terminals are dissociated.")
},
&SilentMode,
false, NULL, NULL
},
{
{"log_checkpoints", PGC_SIGHUP, LOGGING_WHAT,
gettext_noop("Logs each checkpoint."),
NULL
},
&log_checkpoints,
false, NULL, NULL
},
{
{"log_connections", PGC_BACKEND, LOGGING_WHAT,
gettext_noop("Logs each successful connection."),
NULL
},
&Log_connections,
false, NULL, NULL
},
{
{"log_disconnections", PGC_BACKEND, LOGGING_WHAT,
gettext_noop("Logs end of a session, including duration."),
NULL
},
&Log_disconnections,
false, NULL, NULL
},
{
{"debug_assertions", PGC_USERSET, DEVELOPER_OPTIONS,
gettext_noop("Turns on various assertion checks."),
gettext_noop("This is a debugging aid."),
GUC_NOT_IN_SAMPLE
},
&assert_enabled,
#ifdef USE_ASSERT_CHECKING
true,
#else
false,
#endif
assign_debug_assertions, NULL
},
{
/* currently undocumented, so don't show in SHOW ALL */
{"exit_on_error", PGC_USERSET, UNGROUPED,
gettext_noop("No description available."),
NULL,
GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
},
&ExitOnAnyError,
false, NULL, NULL
},
{
{"log_duration", PGC_SUSET, LOGGING_WHAT,
gettext_noop("Logs the duration of each completed SQL statement."),
NULL
},
&log_duration,
false, NULL, NULL
},
{
{"debug_print_parse", PGC_USERSET, LOGGING_WHAT,
gettext_noop("Logs each query's parse tree."),
NULL
},
&Debug_print_parse,
false, NULL, NULL
},
{
{"debug_print_rewritten", PGC_USERSET, LOGGING_WHAT,
gettext_noop("Logs each query's rewritten parse tree."),
NULL
},
&Debug_print_rewritten,
false, NULL, NULL
},
{
{"debug_print_plan", PGC_USERSET, LOGGING_WHAT,
gettext_noop("Logs each query's execution plan."),
NULL
},
&Debug_print_plan,
false, NULL, NULL
},
{
{"debug_pretty_print", PGC_USERSET, LOGGING_WHAT,
gettext_noop("Indents parse and plan tree displays."),
NULL
},
&Debug_pretty_print,
true, NULL, NULL
},
{
{"log_parser_stats", PGC_SUSET, STATS_MONITORING,
gettext_noop("Writes parser performance statistics to the server log."),
NULL
},
&log_parser_stats,
false, assign_stage_log_stats, NULL
},
{
{"log_planner_stats", PGC_SUSET, STATS_MONITORING,
gettext_noop("Writes planner performance statistics to the server log."),
NULL
},
&log_planner_stats,
false, assign_stage_log_stats, NULL
},
{
{"log_executor_stats", PGC_SUSET, STATS_MONITORING,
gettext_noop("Writes executor performance statistics to the server log."),
NULL
},
&log_executor_stats,
false, assign_stage_log_stats, NULL
},
{
{"log_statement_stats", PGC_SUSET, STATS_MONITORING,
gettext_noop("Writes cumulative performance statistics to the server log."),
NULL
},
&log_statement_stats,
false, assign_log_stats, NULL
},
#ifdef BTREE_BUILD_STATS
{
{"log_btree_build_stats", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&log_btree_build_stats,
false, NULL, NULL
},
#endif
{
{"track_activities", PGC_SUSET, STATS_COLLECTOR,
gettext_noop("Collects information about executing commands."),
gettext_noop("Enables the collection of information on the currently "
"executing command of each session, along with "
"the time at which that command began execution.")
},
&pgstat_track_activities,
true, NULL, NULL
},
{
{"track_counts", PGC_SUSET, STATS_COLLECTOR,
gettext_noop("Collects statistics on database activity."),
NULL
},
&pgstat_track_counts,
true, NULL, NULL
},
{
{"update_process_title", PGC_SUSET, STATS_COLLECTOR,
gettext_noop("Updates the process title to show the active SQL command."),
gettext_noop("Enables updating of the process title every time a new SQL command is received by the server.")
},
&update_process_title,
true, NULL, NULL
},
{
{"autovacuum", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Starts the autovacuum subprocess."),
NULL
},
&autovacuum_start_daemon,
true, NULL, NULL
},
{
{"trace_notify", PGC_USERSET, DEVELOPER_OPTIONS,
gettext_noop("Generates debugging output for LISTEN and NOTIFY."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_notify,
false, NULL, NULL
},
#ifdef LOCK_DEBUG
{
{"trace_locks", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_locks,
false, NULL, NULL
},
{
{"trace_userlocks", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_userlocks,
false, NULL, NULL
},
{
{"trace_lwlocks", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_lwlocks,
false, NULL, NULL
},
{
{"debug_deadlocks", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Debug_deadlocks,
false, NULL, NULL
},
#endif
{
{"log_lock_waits", PGC_SUSET, LOGGING_WHAT,
gettext_noop("Logs long lock waits."),
NULL
},
&log_lock_waits,
false, NULL, NULL
},
{
{"log_hostname", PGC_SIGHUP, LOGGING_WHAT,
gettext_noop("Logs the host name in the connection logs."),
gettext_noop("By default, connection logs only show the IP address "
"of the connecting host. If you want them to show the host name you "
"can turn this on, but depending on your host name resolution "
"setup it might impose a non-negligible performance penalty.")
},
&log_hostname,
false, NULL, NULL
},
{
{"sql_inheritance", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Causes subtables to be included by default in various commands."),
NULL
},
&SQL_inheritance,
true, NULL, NULL
},
{
{"password_encryption", PGC_USERSET, CONN_AUTH_SECURITY,
gettext_noop("Encrypt passwords."),
gettext_noop("When a password is specified in CREATE USER or "
"ALTER USER without writing either ENCRYPTED or UNENCRYPTED, "
"this parameter determines whether the password is to be encrypted.")
},
&Password_encryption,
true, NULL, NULL
},
{
{"transform_null_equals", PGC_USERSET, COMPAT_OPTIONS_CLIENT,
gettext_noop("Treats \"expr=NULL\" as \"expr IS NULL\"."),
gettext_noop("When turned on, expressions of the form expr = NULL "
"(or NULL = expr) are treated as expr IS NULL, that is, they "
"return true if expr evaluates to the null value, and false "
"otherwise. The correct behavior of expr = NULL is to always "
"return null (unknown).")
},
&Transform_null_equals,
false, NULL, NULL
},
{
{"db_user_namespace", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Enables per-database user names."),
NULL
},
&Db_user_namespace,
false, NULL, NULL
},
{
/* only here for backwards compatibility */
{"autocommit", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("This parameter doesn't do anything."),
gettext_noop("It's just here so that we won't choke on SET AUTOCOMMIT TO ON from 7.3-vintage clients."),
GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
},
&phony_autocommit,
true, assign_phony_autocommit, NULL
},
{
{"default_transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the default read-only status of new transactions."),
NULL
},
&DefaultXactReadOnly,
false, NULL, NULL
},
{
{"transaction_read_only", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the current transaction's read-only status."),
NULL,
GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&XactReadOnly,
false, assign_transaction_read_only, NULL
},
{
{"add_missing_from", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Automatically adds missing table references to FROM clauses."),
NULL
},
&add_missing_from,
false, NULL, NULL
},
{
{"check_function_bodies", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Check function bodies during CREATE FUNCTION."),
NULL
},
&check_function_bodies,
true, NULL, NULL
},
{
{"array_nulls", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Enable input of NULL elements in arrays."),
gettext_noop("When turned on, unquoted NULL in an array input "
"value means a null value; "
"otherwise it is taken literally.")
},
&Array_nulls,
true, NULL, NULL
},
{
{"default_with_oids", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Create new tables with OIDs by default."),
NULL
},
&default_with_oids,
false, NULL, NULL
},
{
{"logging_collector", PGC_POSTMASTER, LOGGING_WHERE,
gettext_noop("Start a subprocess to capture stderr output and/or csvlogs into log files."),
NULL
},
&Logging_collector,
false, NULL, NULL
},
{
{"log_truncate_on_rotation", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Truncate existing log files of same name during log rotation."),
NULL
},
&Log_truncate_on_rotation,
false, NULL, NULL
},
#ifdef TRACE_SORT
{
{"trace_sort", PGC_USERSET, DEVELOPER_OPTIONS,
gettext_noop("Emit information about resource usage in sorting."),
NULL,
GUC_NOT_IN_SAMPLE
},
&trace_sort,
false, NULL, NULL
},
#endif
#ifdef TRACE_SYNCSCAN
/* this is undocumented because not exposed in a standard build */
{
{"trace_syncscan", PGC_USERSET, DEVELOPER_OPTIONS,
gettext_noop("Generate debugging output for synchronized scanning."),
NULL,
GUC_NOT_IN_SAMPLE
},
&trace_syncscan,
false, NULL, NULL
},
#endif
#ifdef DEBUG_BOUNDED_SORT
/* this is undocumented because not exposed in a standard build */
{
{
"optimize_bounded_sort", PGC_USERSET, QUERY_TUNING_METHOD,
gettext_noop("Enable bounded sorting using heap sort."),
NULL,
GUC_NOT_IN_SAMPLE
},
&optimize_bounded_sort,
true, NULL, NULL
},
#endif
#ifdef WAL_DEBUG
{
{"wal_debug", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("Emit WAL-related debugging output."),
NULL,
GUC_NOT_IN_SAMPLE
},
&XLOG_DEBUG,
false, NULL, NULL
},
#endif
{
{"integer_datetimes", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Datetimes are integer based."),
NULL,
GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&integer_datetimes,
#ifdef HAVE_INT64_TIMESTAMP
true, NULL, NULL
#else
false, NULL, NULL
#endif
},
{
{"krb_caseins_users", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive."),
NULL
},
&pg_krb_caseins_users,
false, NULL, NULL
},
{
{"escape_string_warning", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Warn about backslash escapes in ordinary string literals."),
NULL
},
&escape_string_warning,
true, NULL, NULL
},
{
{"standard_conforming_strings", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Causes '...' strings to treat backslashes literally."),
NULL,
GUC_REPORT
},
&standard_conforming_strings,
false, NULL, NULL
},
{
{"synchronize_seqscans", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Enable synchronized sequential scans."),
NULL
},
&synchronize_seqscans,
true, NULL, NULL
},
{
{"archive_mode", PGC_POSTMASTER, WAL_SETTINGS,
gettext_noop("Allows archiving of WAL files using archive_command."),
NULL
},
&XLogArchiveMode,
false, NULL, NULL
},
{
{"allow_system_table_mods", PGC_POSTMASTER, DEVELOPER_OPTIONS,
gettext_noop("Allows modifications of the structure of system tables."),
NULL,
GUC_NOT_IN_SAMPLE
},
&allowSystemTableMods,
false, NULL, NULL
},
{
{"ignore_system_indexes", PGC_BACKEND, DEVELOPER_OPTIONS,
gettext_noop("Disables reading from system indexes."),
gettext_noop("It does not prevent updating the indexes, so it is safe "
"to use. The worst consequence is slowness."),
GUC_NOT_IN_SAMPLE
},
&IgnoreSystemIndexes,
false, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL
}
};
static struct config_int ConfigureNamesInt[] =
{
{
{"archive_timeout", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Forces a switch to the next xlog file if a "
"new file has not been started within N seconds."),
NULL,
GUC_UNIT_S
},
&XLogArchiveTimeout,
0, 0, INT_MAX, NULL, NULL
},
{
{"post_auth_delay", PGC_BACKEND, DEVELOPER_OPTIONS,
gettext_noop("Waits N seconds on connection startup after authentication."),
gettext_noop("This allows attaching a debugger to the process."),
GUC_NOT_IN_SAMPLE | GUC_UNIT_S
},
&PostAuthDelay,
0, 0, INT_MAX, NULL, NULL
},
{
{"default_statistics_target", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the default statistics target."),
gettext_noop("This applies to table columns that have not had a "
"column-specific target set via ALTER TABLE SET STATISTICS.")
},
&default_statistics_target,
100, 1, 10000, NULL, NULL
},
{
{"from_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the FROM-list size beyond which subqueries "
"are not collapsed."),
gettext_noop("The planner will merge subqueries into upper "
"queries if the resulting FROM list would have no more than "
"this many items.")
},
&from_collapse_limit,
8, 1, INT_MAX, NULL, NULL
},
{
{"join_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the FROM-list size beyond which JOIN "
"constructs are not flattened."),
gettext_noop("The planner will flatten explicit JOIN "
"constructs into lists of FROM items whenever a "
"list of no more than this many items would result.")
},
&join_collapse_limit,
8, 1, INT_MAX, NULL, NULL
},
{
{"geqo_threshold", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("Sets the threshold of FROM items beyond which GEQO is used."),
NULL
},
&geqo_threshold,
12, 2, INT_MAX, NULL, NULL
},
{
{"geqo_effort", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: effort is used to set the default for other GEQO parameters."),
NULL
},
&Geqo_effort,
DEFAULT_GEQO_EFFORT, MIN_GEQO_EFFORT, MAX_GEQO_EFFORT, NULL, NULL
},
{
{"geqo_pool_size", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: number of individuals in the population."),
gettext_noop("Zero selects a suitable default value.")
},
&Geqo_pool_size,
0, 0, INT_MAX, NULL, NULL
},
{
{"geqo_generations", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: number of iterations of the algorithm."),
gettext_noop("Zero selects a suitable default value.")
},
&Geqo_generations,
0, 0, INT_MAX, NULL, NULL
},
{
/* This is PGC_SIGHUP so all backends have the same value. */
{"deadlock_timeout", PGC_SIGHUP, LOCK_MANAGEMENT,
gettext_noop("Sets the time to wait on a lock before checking for deadlock."),
NULL,
GUC_UNIT_MS
},
&DeadlockTimeout,
1000, 1, INT_MAX / 1000, NULL, NULL
},
/*
* Note: MaxBackends is limited to INT_MAX/4 because some places compute
* 4*MaxBackends without any overflow check. This check is made in
* assign_maxconnections, since MaxBackends is computed as MaxConnections
* plus autovacuum_max_workers.
*
* Likewise we have to limit NBuffers to INT_MAX/2.
*/
{
{"max_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the maximum number of concurrent connections."),
NULL
},
&MaxConnections,
100, 1, INT_MAX / 4, assign_maxconnections, NULL
},
{
{"superuser_reserved_connections", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the number of connection slots reserved for superusers."),
NULL
},
&ReservedBackends,
3, 0, INT_MAX / 4, NULL, NULL
},
{
{"shared_buffers", PGC_POSTMASTER, RESOURCES_MEM,
gettext_noop("Sets the number of shared memory buffers used by the server."),
NULL,
GUC_UNIT_BLOCKS
},
&NBuffers,
1024, 16, INT_MAX / 2, NULL, NULL
},
{
{"temp_buffers", PGC_USERSET, RESOURCES_MEM,
gettext_noop("Sets the maximum number of temporary buffers used by each session."),
NULL,
GUC_UNIT_BLOCKS
},
&num_temp_buffers,
1024, 100, INT_MAX / 2, NULL, show_num_temp_buffers
},
{
{"port", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the TCP port the server listens on."),
NULL
},
&PostPortNumber,
DEF_PGPORT, 1, 65535, NULL, NULL
},
{
{"unix_socket_permissions", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the access permissions of the Unix-domain socket."),
gettext_noop("Unix-domain sockets use the usual Unix file system "
"permission set. The parameter value is expected to be a numeric mode "
"specification in the form accepted by the chmod and umask system "
"calls. (To use the customary octal format the number must start with "
"a 0 (zero).)")
},
&Unix_socket_permissions,
0777, 0000, 0777, NULL, NULL
},
{
{"work_mem", PGC_USERSET, RESOURCES_MEM,
gettext_noop("Sets the maximum memory to be used for query workspaces."),
gettext_noop("This much memory can be used by each internal "
"sort operation and hash table before switching to "
"temporary disk files."),
GUC_UNIT_KB
},
&work_mem,
1024, 64, MAX_KILOBYTES, NULL, NULL
},
{
{"maintenance_work_mem", PGC_USERSET, RESOURCES_MEM,
gettext_noop("Sets the maximum memory to be used for maintenance operations."),
gettext_noop("This includes operations such as VACUUM and CREATE INDEX."),
GUC_UNIT_KB
},
&maintenance_work_mem,
16384, 1024, MAX_KILOBYTES, NULL, NULL
},
{
{"max_stack_depth", PGC_SUSET, RESOURCES_MEM,
gettext_noop("Sets the maximum stack depth, in kilobytes."),
NULL,
GUC_UNIT_KB
},
&max_stack_depth,
100, 100, MAX_KILOBYTES, assign_max_stack_depth, NULL
},
{
{"vacuum_cost_page_hit", PGC_USERSET, RESOURCES,
gettext_noop("Vacuum cost for a page found in the buffer cache."),
NULL
},
&VacuumCostPageHit,
1, 0, 10000, NULL, NULL
},
{
{"vacuum_cost_page_miss", PGC_USERSET, RESOURCES,
gettext_noop("Vacuum cost for a page not found in the buffer cache."),
NULL
},
&VacuumCostPageMiss,
10, 0, 10000, NULL, NULL
},
{
{"vacuum_cost_page_dirty", PGC_USERSET, RESOURCES,
gettext_noop("Vacuum cost for a page dirtied by vacuum."),
NULL
},
&VacuumCostPageDirty,
20, 0, 10000, NULL, NULL
},
{
{"vacuum_cost_limit", PGC_USERSET, RESOURCES,
gettext_noop("Vacuum cost amount available before napping."),
NULL
},
&VacuumCostLimit,
200, 1, 10000, NULL, NULL
},
{
{"vacuum_cost_delay", PGC_USERSET, RESOURCES,
gettext_noop("Vacuum cost delay in milliseconds."),
NULL,
GUC_UNIT_MS
},
&VacuumCostDelay,
0, 0, 1000, NULL, NULL
},
{
{"autovacuum_vacuum_cost_delay", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Vacuum cost delay in milliseconds, for autovacuum."),
NULL,
GUC_UNIT_MS
},
&autovacuum_vac_cost_delay,
20, -1, 1000, NULL, NULL
},
{
{"autovacuum_vacuum_cost_limit", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Vacuum cost amount available before napping, for autovacuum."),
NULL
},
&autovacuum_vac_cost_limit,
-1, -1, 10000, NULL, NULL
},
{
{"max_files_per_process", PGC_POSTMASTER, RESOURCES_KERNEL,
gettext_noop("Sets the maximum number of simultaneously open files for each server process."),
NULL
},
&max_files_per_process,
1000, 25, INT_MAX, NULL, NULL
},
{
{"max_prepared_transactions", PGC_POSTMASTER, RESOURCES,
gettext_noop("Sets the maximum number of simultaneously prepared transactions."),
NULL
},
&max_prepared_xacts,
5, 0, INT_MAX, NULL, NULL
},
#ifdef LOCK_DEBUG
{
{"trace_lock_oidmin", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_lock_oidmin,
FirstNormalObjectId, 0, INT_MAX, NULL, NULL
},
{
{"trace_lock_table", PGC_SUSET, DEVELOPER_OPTIONS,
gettext_noop("No description available."),
NULL,
GUC_NOT_IN_SAMPLE
},
&Trace_lock_table,
0, 0, INT_MAX, NULL, NULL
},
#endif
{
{"statement_timeout", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the maximum allowed duration of any statement."),
gettext_noop("A value of 0 turns off the timeout."),
GUC_UNIT_MS
},
&StatementTimeout,
0, 0, INT_MAX, NULL, NULL
},
{
{"vacuum_freeze_min_age", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Minimum age at which VACUUM should freeze a table row."),
NULL
},
&vacuum_freeze_min_age,
100000000, 0, 1000000000, NULL, NULL
},
{
{"max_locks_per_transaction", PGC_POSTMASTER, LOCK_MANAGEMENT,
gettext_noop("Sets the maximum number of locks per transaction."),
gettext_noop("The shared lock table is sized on the assumption that "
"at most max_locks_per_transaction * max_connections distinct "
"objects will need to be locked at any one time.")
},
&max_locks_per_xact,
64, 10, INT_MAX, NULL, NULL
},
{
{"authentication_timeout", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets the maximum allowed time to complete client authentication."),
NULL,
GUC_UNIT_S
},
&AuthenticationTimeout,
60, 1, 600, NULL, NULL
},
{
/* Not for general use */
{"pre_auth_delay", PGC_SIGHUP, DEVELOPER_OPTIONS,
gettext_noop("Waits N seconds on connection startup before authentication."),
gettext_noop("This allows attaching a debugger to the process."),
GUC_NOT_IN_SAMPLE | GUC_UNIT_S
},
&PreAuthDelay,
0, 0, 60, NULL, NULL
},
{
{"checkpoint_segments", PGC_SIGHUP, WAL_CHECKPOINTS,
gettext_noop("Sets the maximum distance in log segments between automatic WAL checkpoints."),
NULL
},
&CheckPointSegments,
3, 1, INT_MAX, NULL, NULL
},
{
{"checkpoint_timeout", PGC_SIGHUP, WAL_CHECKPOINTS,
gettext_noop("Sets the maximum time between automatic WAL checkpoints."),
NULL,
GUC_UNIT_S
},
&CheckPointTimeout,
300, 30, 3600, NULL, NULL
},
{
{"checkpoint_warning", PGC_SIGHUP, WAL_CHECKPOINTS,
gettext_noop("Enables warnings if checkpoint segments are filled more "
"frequently than this."),
gettext_noop("Write a message to the server log if checkpoints "
"caused by the filling of checkpoint segment files happens more "
"frequently than this number of seconds. Zero turns off the warning."),
GUC_UNIT_S
},
&CheckPointWarning,
30, 0, INT_MAX, NULL, NULL
},
{
{"wal_buffers", PGC_POSTMASTER, WAL_SETTINGS,
gettext_noop("Sets the number of disk-page buffers in shared memory for WAL."),
NULL,
GUC_UNIT_XBLOCKS
},
&XLOGbuffers,
8, 4, INT_MAX, NULL, NULL
},
{
{"wal_writer_delay", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("WAL writer sleep time between WAL flushes."),
NULL,
GUC_UNIT_MS
},
&WalWriterDelay,
200, 1, 10000, NULL, NULL
},
{
{"commit_delay", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets the delay in microseconds between transaction commit and "
"flushing WAL to disk."),
NULL
},
&CommitDelay,
0, 0, 100000, NULL, NULL
},
{
{"commit_siblings", PGC_USERSET, WAL_SETTINGS,
gettext_noop("Sets the minimum concurrent open transactions before performing "
"commit_delay."),
NULL
},
&CommitSiblings,
5, 1, 1000, NULL, NULL
},
{
{"extra_float_digits", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the number of digits displayed for floating-point values."),
gettext_noop("This affects real, double precision, and geometric data types. "
"The parameter value is added to the standard number of digits "
"(FLT_DIG or DBL_DIG as appropriate).")
},
&extra_float_digits,
0, -15, 2, NULL, NULL
},
{
{"log_min_duration_statement", PGC_SUSET, LOGGING_WHEN,
gettext_noop("Sets the minimum execution time above which "
"statements will be logged."),
gettext_noop("Zero prints all queries. -1 turns this feature off."),
GUC_UNIT_MS
},
&log_min_duration_statement,
-1, -1, INT_MAX / 1000, NULL, NULL
},
{
{"log_autovacuum_min_duration", PGC_SIGHUP, LOGGING_WHAT,
gettext_noop("Sets the minimum execution time above which "
"autovacuum actions will be logged."),
gettext_noop("Zero prints all actions. -1 turns autovacuum logging off."),
GUC_UNIT_MS
},
&Log_autovacuum_min_duration,
-1, -1, INT_MAX / 1000, NULL, NULL
},
{
{"bgwriter_delay", PGC_SIGHUP, RESOURCES,
gettext_noop("Background writer sleep time between rounds."),
NULL,
GUC_UNIT_MS
},
&BgWriterDelay,
200, 10, 10000, NULL, NULL
},
{
{"bgwriter_lru_maxpages", PGC_SIGHUP, RESOURCES,
gettext_noop("Background writer maximum number of LRU pages to flush per round."),
NULL
},
&bgwriter_lru_maxpages,
100, 0, 1000, NULL, NULL
},
{
{"log_rotation_age", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Automatic log file rotation will occur after N minutes."),
NULL,
GUC_UNIT_MIN
},
&Log_RotationAge,
HOURS_PER_DAY * MINS_PER_HOUR, 0, INT_MAX / MINS_PER_HOUR, NULL, NULL
},
{
{"log_rotation_size", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Automatic log file rotation will occur after N kilobytes."),
NULL,
GUC_UNIT_KB
},
&Log_RotationSize,
10 * 1024, 0, INT_MAX / 1024, NULL, NULL
},
{
{"max_function_args", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the maximum number of function arguments."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&max_function_args,
FUNC_MAX_ARGS, FUNC_MAX_ARGS, FUNC_MAX_ARGS, NULL, NULL
},
{
{"max_index_keys", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the maximum number of index keys."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&max_index_keys,
INDEX_MAX_KEYS, INDEX_MAX_KEYS, INDEX_MAX_KEYS, NULL, NULL
},
{
{"max_identifier_length", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the maximum identifier length."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&max_identifier_length,
NAMEDATALEN - 1, NAMEDATALEN - 1, NAMEDATALEN - 1, NULL, NULL
},
{
{"block_size", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the size of a disk block."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&block_size,
BLCKSZ, BLCKSZ, BLCKSZ, NULL, NULL
},
{
{"segment_size", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the number of pages per disk file."),
NULL,
GUC_UNIT_BLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&segment_size,
RELSEG_SIZE, RELSEG_SIZE, RELSEG_SIZE, NULL, NULL
},
{
{"wal_block_size", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the block size in the write ahead log."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&wal_block_size,
XLOG_BLCKSZ, XLOG_BLCKSZ, XLOG_BLCKSZ, NULL, NULL
},
{
{"wal_segment_size", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the number of pages per write ahead log segment."),
NULL,
GUC_UNIT_XBLOCKS | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&wal_segment_size,
(XLOG_SEG_SIZE / XLOG_BLCKSZ),
(XLOG_SEG_SIZE / XLOG_BLCKSZ),
(XLOG_SEG_SIZE / XLOG_BLCKSZ),
NULL, NULL
},
{
{"autovacuum_naptime", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Time to sleep between autovacuum runs."),
NULL,
GUC_UNIT_S
},
&autovacuum_naptime,
60, 1, INT_MAX / 1000, NULL, NULL
},
{
{"autovacuum_vacuum_threshold", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Minimum number of tuple updates or deletes prior to vacuum."),
NULL
},
&autovacuum_vac_thresh,
50, 0, INT_MAX, NULL, NULL
},
{
{"autovacuum_analyze_threshold", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Minimum number of tuple inserts, updates or deletes prior to analyze."),
NULL
},
&autovacuum_anl_thresh,
50, 0, INT_MAX, NULL, NULL
},
{
/* see varsup.c for why this is PGC_POSTMASTER not PGC_SIGHUP */
{"autovacuum_freeze_max_age", PGC_POSTMASTER, AUTOVACUUM,
gettext_noop("Age at which to autovacuum a table to prevent transaction ID wraparound."),
NULL
},
&autovacuum_freeze_max_age,
200000000, 100000000, 2000000000, NULL, NULL
},
{
/* see max_connections */
{"autovacuum_max_workers", PGC_POSTMASTER, AUTOVACUUM,
gettext_noop("Sets the maximum number of simultaneously running autovacuum worker processes."),
NULL
},
&autovacuum_max_workers,
3, 1, INT_MAX / 4, assign_autovacuum_max_workers, NULL
},
{
{"tcp_keepalives_idle", PGC_USERSET, CLIENT_CONN_OTHER,
gettext_noop("Time between issuing TCP keepalives."),
gettext_noop("A value of 0 uses the system default."),
GUC_UNIT_S
},
&tcp_keepalives_idle,
0, 0, INT_MAX, assign_tcp_keepalives_idle, show_tcp_keepalives_idle
},
{
{"tcp_keepalives_interval", PGC_USERSET, CLIENT_CONN_OTHER,
gettext_noop("Time between TCP keepalive retransmits."),
gettext_noop("A value of 0 uses the system default."),
GUC_UNIT_S
},
&tcp_keepalives_interval,
0, 0, INT_MAX, assign_tcp_keepalives_interval, show_tcp_keepalives_interval
},
{
{"tcp_keepalives_count", PGC_USERSET, CLIENT_CONN_OTHER,
gettext_noop("Maximum number of TCP keepalive retransmits."),
gettext_noop("This controls the number of consecutive keepalive retransmits that can be "
"lost before a connection is considered dead. A value of 0 uses the "
"system default."),
},
&tcp_keepalives_count,
0, 0, INT_MAX, assign_tcp_keepalives_count, show_tcp_keepalives_count
},
{
{"gin_fuzzy_search_limit", PGC_USERSET, CLIENT_CONN_OTHER,
gettext_noop("Sets the maximum allowed result for exact search by GIN."),
NULL,
0
},
&GinFuzzySearchLimit,
0, 0, INT_MAX, NULL, NULL
},
{
{"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's assumption about the size of the disk cache."),
gettext_noop("That is, the portion of the kernel's disk cache that "
"will be used for PostgreSQL data files. This is measured in disk "
"pages, which are normally 8 kB each."),
GUC_UNIT_BLOCKS,
},
&effective_cache_size,
DEFAULT_EFFECTIVE_CACHE_SIZE, 1, INT_MAX, NULL, NULL
},
{
/* Can't be set in postgresql.conf */
{"server_version_num", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the server version as an integer."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&server_version_num,
PG_VERSION_NUM, PG_VERSION_NUM, PG_VERSION_NUM, NULL, NULL
},
{
{"log_temp_files", PGC_SUSET, LOGGING_WHAT,
gettext_noop("Log the use of temporary files larger than this number of kilobytes."),
gettext_noop("Zero logs all files. The default is -1 (turning this feature off)."),
GUC_UNIT_KB
},
&log_temp_files,
-1, -1, INT_MAX, NULL, NULL
},
{
{"track_activity_query_size", PGC_POSTMASTER, RESOURCES_MEM,
gettext_noop("Sets the size reserved for pg_stat_activity.current_query, in bytes."),
NULL,
},
&pgstat_track_activity_query_size,
1024, 100, 102400, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL
}
};
static struct config_real ConfigureNamesReal[] =
{
{
{"seq_page_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of a "
"sequentially fetched disk page."),
NULL
},
&seq_page_cost,
DEFAULT_SEQ_PAGE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"random_page_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of a "
"nonsequentially fetched disk page."),
NULL
},
&random_page_cost,
DEFAULT_RANDOM_PAGE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each tuple (row)."),
NULL
},
&cpu_tuple_cost,
DEFAULT_CPU_TUPLE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_index_tuple_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each index entry during an index scan."),
NULL
},
&cpu_index_tuple_cost,
DEFAULT_CPU_INDEX_TUPLE_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cpu_operator_cost", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's estimate of the cost of "
"processing each operator or function call."),
NULL
},
&cpu_operator_cost,
DEFAULT_CPU_OPERATOR_COST, 0, DBL_MAX, NULL, NULL
},
{
{"cursor_tuple_fraction", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the planner's estimate of the fraction of "
"a cursor's rows that will be retrieved."),
NULL
},
&cursor_tuple_fraction,
DEFAULT_CURSOR_TUPLE_FRACTION, 0.0, 1.0, NULL, NULL
},
{
{"geqo_selection_bias", PGC_USERSET, QUERY_TUNING_GEQO,
gettext_noop("GEQO: selective pressure within the population."),
NULL
},
&Geqo_selection_bias,
DEFAULT_GEQO_SELECTION_BIAS, MIN_GEQO_SELECTION_BIAS,
MAX_GEQO_SELECTION_BIAS, NULL, NULL
},
{
{"bgwriter_lru_multiplier", PGC_SIGHUP, RESOURCES,
gettext_noop("Multiple of the average buffer usage to free per round."),
NULL
},
&bgwriter_lru_multiplier,
2.0, 0.0, 10.0, NULL, NULL
},
{
{"seed", PGC_USERSET, UNGROUPED,
gettext_noop("Sets the seed for random-number generation."),
NULL,
GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&phony_random_seed,
0.0, -1.0, 1.0, assign_random_seed, show_random_seed
},
{
{"autovacuum_vacuum_scale_factor", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Number of tuple updates or deletes prior to vacuum as a fraction of reltuples."),
NULL
},
&autovacuum_vac_scale,
0.2, 0.0, 100.0, NULL, NULL
},
{
{"autovacuum_analyze_scale_factor", PGC_SIGHUP, AUTOVACUUM,
gettext_noop("Number of tuple inserts, updates or deletes prior to analyze as a fraction of reltuples."),
NULL
},
&autovacuum_anl_scale,
0.1, 0.0, 100.0, NULL, NULL
},
{
{"checkpoint_completion_target", PGC_SIGHUP, WAL_CHECKPOINTS,
gettext_noop("Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval."),
NULL
},
&CheckPointCompletionTarget,
0.5, 0.0, 1.0, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0.0, 0.0, 0.0, NULL, NULL
}
};
static struct config_string ConfigureNamesString[] =
{
{
{"archive_command", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Sets the shell command that will be called to archive a WAL file."),
NULL
},
&XLogArchiveCommand,
"", NULL, show_archive_command
},
{
{"client_encoding", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the client's character set encoding."),
NULL,
GUC_IS_NAME | GUC_REPORT
},
&client_encoding_string,
"SQL_ASCII", assign_client_encoding, NULL
},
{
{"log_line_prefix", PGC_SIGHUP, LOGGING_WHAT,
gettext_noop("Controls information prefixed to each log line."),
gettext_noop("If blank, no prefix is used.")
},
&Log_line_prefix,
"", NULL, NULL
},
{
{"log_timezone", PGC_SIGHUP, LOGGING_WHAT,
gettext_noop("Sets the time zone to use in log messages."),
NULL
},
&log_timezone_string,
"UNKNOWN", assign_log_timezone, show_log_timezone
},
{
{"DateStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the display format for date and time values."),
gettext_noop("Also controls interpretation of ambiguous "
"date inputs."),
GUC_LIST_INPUT | GUC_REPORT
},
&datestyle_string,
"ISO, MDY", assign_datestyle, NULL
},
{
{"default_tablespace", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the default tablespace to create tables and indexes in."),
gettext_noop("An empty string selects the database's default tablespace."),
GUC_IS_NAME
},
&default_tablespace,
"", assign_default_tablespace, NULL
},
{
{"temp_tablespaces", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the tablespace(s) to use for temporary tables and sort files."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},
&temp_tablespaces,
"", assign_temp_tablespaces, NULL
},
{
{"dynamic_library_path", PGC_SUSET, CLIENT_CONN_OTHER,
gettext_noop("Sets the path for dynamically loadable modules."),
gettext_noop("If a dynamically loadable module needs to be opened and "
"the specified name does not have a directory component (i.e., the "
"name does not contain a slash), the system will search this path for "
"the specified file."),
GUC_SUPERUSER_ONLY
},
&Dynamic_library_path,
"$libdir", NULL, NULL
},
{
{"krb_realm", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets realm to match Kerberos and GSSAPI users against."),
NULL,
GUC_SUPERUSER_ONLY
},
&pg_krb_realm,
NULL, NULL, NULL
},
{
{"krb_server_keyfile", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets the location of the Kerberos server key file."),
NULL,
GUC_SUPERUSER_ONLY
},
&pg_krb_server_keyfile,
PG_KRB_SRVTAB, NULL, NULL
},
{
{"krb_srvname", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets the name of the Kerberos service."),
NULL
},
&pg_krb_srvnam,
PG_KRB_SRVNAM, NULL, NULL
},
{
{"krb_server_hostname", PGC_SIGHUP, CONN_AUTH_SECURITY,
gettext_noop("Sets the hostname of the Kerberos server."),
NULL
},
&pg_krb_server_hostname,
NULL, NULL, NULL
},
{
{"bonjour_name", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the Bonjour broadcast service name."),
NULL
},
&bonjour_name,
"", NULL, NULL
},
/* See main.c about why defaults for LC_foo are not all alike */
{
{"lc_collate", PGC_INTERNAL, CLIENT_CONN_LOCALE,
gettext_noop("Shows the collation order locale."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&locale_collate,
"C", NULL, NULL
},
{
{"lc_ctype", PGC_INTERNAL, CLIENT_CONN_LOCALE,
gettext_noop("Shows the character classification and case conversion locale."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&locale_ctype,
"C", NULL, NULL
},
{
{"lc_messages", PGC_SUSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the language in which messages are displayed."),
NULL
},
&locale_messages,
"", locale_messages_assign, NULL
},
{
{"lc_monetary", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the locale for formatting monetary amounts."),
NULL
},
&locale_monetary,
"C", locale_monetary_assign, NULL
},
{
{"lc_numeric", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the locale for formatting numbers."),
NULL
},
&locale_numeric,
"C", locale_numeric_assign, NULL
},
{
{"lc_time", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the locale for formatting date and time values."),
NULL
},
&locale_time,
"C", locale_time_assign, NULL
},
{
{"shared_preload_libraries", PGC_POSTMASTER, RESOURCES_KERNEL,
gettext_noop("Lists shared libraries to preload into server."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE | GUC_SUPERUSER_ONLY
},
&shared_preload_libraries_string,
"", NULL, NULL
},
{
{"local_preload_libraries", PGC_BACKEND, CLIENT_CONN_OTHER,
gettext_noop("Lists shared libraries to preload into each backend."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},
&local_preload_libraries_string,
"", NULL, NULL
},
{
{"search_path", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the schema search order for names that are not schema-qualified."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},
&namespace_search_path,
"\"$user\",public", assign_search_path, NULL
},
{
/* Can't be set in postgresql.conf */
{"server_encoding", PGC_INTERNAL, CLIENT_CONN_LOCALE,
gettext_noop("Sets the server (database) character set encoding."),
NULL,
GUC_IS_NAME | GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&server_encoding_string,
"SQL_ASCII", NULL, NULL
},
{
/* Can't be set in postgresql.conf */
{"server_version", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows the server version."),
NULL,
GUC_REPORT | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&server_version_string,
PG_VERSION, NULL, NULL
},
{
/* Not for general use --- used by SET ROLE */
{"role", PGC_USERSET, UNGROUPED,
gettext_noop("Sets the current role."),
NULL,
GUC_IS_NAME | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&role_string,
"none", assign_role, show_role
},
{
/* Not for general use --- used by SET SESSION AUTHORIZATION */
{"session_authorization", PGC_USERSET, UNGROUPED,
gettext_noop("Sets the session user name."),
NULL,
GUC_IS_NAME | GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&session_authorization_string,
NULL, assign_session_authorization, show_session_authorization
},
{
{"log_destination", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Sets the destination for server log output."),
gettext_noop("Valid values are combinations of \"stderr\", "
"\"syslog\", \"csvlog\", and \"eventlog\", "
"depending on the platform."),
GUC_LIST_INPUT
},
&log_destination_string,
"stderr", assign_log_destination, NULL
},
{
{"log_directory", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Sets the destination directory for log files."),
gettext_noop("Can be specified as relative to the data directory "
"or as absolute path."),
GUC_SUPERUSER_ONLY
},
&Log_directory,
"pg_log", assign_canonical_path, NULL
},
{
{"log_filename", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Sets the file name pattern for log files."),
NULL,
GUC_SUPERUSER_ONLY
},
&Log_filename,
"postgresql-%Y-%m-%d_%H%M%S.log", NULL, NULL
},
#ifdef HAVE_SYSLOG
{
{"syslog_ident", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Sets the program name used to identify PostgreSQL "
"messages in syslog."),
NULL
},
&syslog_ident_str,
"postgres", assign_syslog_ident, NULL
},
#endif
{
{"TimeZone", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the time zone for displaying and interpreting time stamps."),
NULL,
GUC_REPORT
},
&timezone_string,
"UNKNOWN", assign_timezone, show_timezone
},
{
{"timezone_abbreviations", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Selects a file of time zone abbreviations."),
NULL
},
&timezone_abbreviations_string,
"UNKNOWN", assign_timezone_abbreviations, NULL
},
{
{"transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the current transaction's isolation level."),
NULL,
GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&XactIsoLevel_string,
NULL, assign_XactIsoLevel, show_XactIsoLevel
},
{
{"unix_socket_group", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the owning group of the Unix-domain socket."),
gettext_noop("The owning user of the socket is always the user "
"that starts the server.")
},
&Unix_socket_group,
"", NULL, NULL
},
{
{"unix_socket_directory", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the directory where the Unix-domain socket will be created."),
NULL,
GUC_SUPERUSER_ONLY
},
&UnixSocketDir,
"", assign_canonical_path, NULL
},
{
{"listen_addresses", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
gettext_noop("Sets the host name or IP address(es) to listen to."),
NULL,
GUC_LIST_INPUT
},
&ListenAddresses,
"localhost", NULL, NULL
},
{
{"custom_variable_classes", PGC_SIGHUP, CUSTOM_OPTIONS,
gettext_noop("Sets the list of known custom variable classes."),
NULL,
GUC_LIST_INPUT | GUC_LIST_QUOTE
},
&custom_variable_classes,
NULL, assign_custom_variable_classes, NULL
},
{
{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's data directory."),
NULL,
GUC_SUPERUSER_ONLY
},
&data_directory,
NULL, NULL, NULL
},
{
{"config_file", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's main configuration file."),
NULL,
GUC_DISALLOW_IN_FILE | GUC_SUPERUSER_ONLY
},
&ConfigFileName,
NULL, NULL, NULL
},
{
{"hba_file", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's \"hba\" configuration file."),
NULL,
GUC_SUPERUSER_ONLY
},
&HbaFileName,
NULL, NULL, NULL
},
{
{"ident_file", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's \"ident\" configuration file."),
NULL,
GUC_SUPERUSER_ONLY
},
&IdentFileName,
NULL, NULL, NULL
},
{
{"external_pid_file", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Writes the postmaster PID to the specified file."),
NULL,
GUC_SUPERUSER_ONLY
},
&external_pid_file,
NULL, assign_canonical_path, NULL
},
{
{"stats_temp_directory", PGC_SIGHUP, STATS_COLLECTOR,
gettext_noop("Writes temporary statistics files to the specified directory."),
NULL,
GUC_SUPERUSER_ONLY
},
&pgstat_temp_directory,
"pg_stat_tmp", assign_pgstat_temp_directory, NULL
},
{
{"default_text_search_config", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets default text search configuration."),
NULL
},
&TSCurrentConfig,
"pg_catalog.simple", assignTSCurrentConfig, NULL
},
#ifdef USE_SSL
{
{"ssl_ciphers", PGC_POSTMASTER, CONN_AUTH_SECURITY,
gettext_noop("Sets the list of allowed SSL ciphers."),
NULL,
GUC_SUPERUSER_ONLY
},
&SSLCipherSuites,
"ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH", NULL, NULL
},
#endif /* USE_SSL */
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL
}
};
static struct config_enum ConfigureNamesEnum[] =
{
{
{"backslash_quote", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Sets whether \"\\'\" is allowed in string literals."),
NULL
},
&backslash_quote,
BACKSLASH_QUOTE_SAFE_ENCODING, backslash_quote_options, NULL, NULL
},
{
{"client_min_messages", PGC_USERSET, LOGGING_WHEN,
gettext_noop("Sets the message levels that are sent to the client."),
gettext_noop("Each level includes all the levels that follow it. The later"
" the level, the fewer messages are sent.")
},
&client_min_messages,
NOTICE, client_message_level_options, NULL, NULL
},
{
{"default_transaction_isolation", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the transaction isolation level of each new transaction."),
NULL
},
&DefaultXactIsoLevel,
XACT_READ_COMMITTED, isolation_level_options, NULL, NULL
},
{
{"IntervalStyle", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the display format for interval values."),
NULL,
GUC_REPORT
},
&IntervalStyle,
INTSTYLE_POSTGRES, intervalstyle_options, NULL, NULL
},
{
{"log_error_verbosity", PGC_SUSET, LOGGING_WHEN,
gettext_noop("Sets the verbosity of logged messages."),
NULL
},
&Log_error_verbosity,
PGERROR_DEFAULT, log_error_verbosity_options, NULL, NULL
},
{
{"log_min_messages", PGC_SUSET, LOGGING_WHEN,
gettext_noop("Sets the message levels that are logged."),
gettext_noop("Each level includes all the levels that follow it. The later"
" the level, the fewer messages are sent.")
},
&log_min_messages,
WARNING, server_message_level_options, NULL, NULL
},
{
{"log_min_error_statement", PGC_SUSET, LOGGING_WHEN,
gettext_noop("Causes all statements generating error at or above this level to be logged."),
gettext_noop("Each level includes all the levels that follow it. The later"
" the level, the fewer messages are sent.")
},
&log_min_error_statement,
ERROR, server_message_level_options, NULL, NULL
},
{
{"log_statement", PGC_SUSET, LOGGING_WHAT,
gettext_noop("Sets the type of statements logged."),
NULL
},
&log_statement,
LOGSTMT_NONE, log_statement_options, NULL, NULL
},
#ifdef HAVE_SYSLOG
{
{"syslog_facility", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Sets the syslog \"facility\" to be used when syslog enabled."),
NULL
},
&syslog_facility,
LOG_LOCAL0, syslog_facility_options, assign_syslog_facility, NULL
},
#endif
{
{"regex_flavor", PGC_USERSET, COMPAT_OPTIONS_PREVIOUS,
gettext_noop("Sets the regular expression \"flavor\"."),
NULL
},
&regex_flavor,
REG_ADVANCED, regex_flavor_options, NULL, NULL
},
{
{"session_replication_role", PGC_SUSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets the session's behavior for triggers and rewrite rules."),
NULL
},
&SessionReplicationRole,
SESSION_REPLICATION_ROLE_ORIGIN, session_replication_role_options,
assign_session_replication_role, NULL
},
{
{"track_functions", PGC_SUSET, STATS_COLLECTOR,
gettext_noop("Collects function-level statistics on database activity."),
NULL
},
&pgstat_track_functions,
TRACK_FUNC_OFF, track_function_options, NULL, NULL
},
{
{"wal_sync_method", PGC_SIGHUP, WAL_SETTINGS,
gettext_noop("Selects the method used for forcing WAL updates to disk."),
NULL
},
&sync_method,
DEFAULT_SYNC_METHOD, sync_method_options,
assign_xlog_sync_method, NULL
},
{
{"xmlbinary", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets how binary values are to be encoded in XML."),
NULL
},
&xmlbinary,
XMLBINARY_BASE64, xmlbinary_options, NULL, NULL
},
{
{"xmloption", PGC_USERSET, CLIENT_CONN_STATEMENT,
gettext_noop("Sets whether XML data in implicit parsing and serialization "
"operations is to be considered as documents or content fragments."),
NULL
},
&xmloption,
XMLOPTION_CONTENT, xmloption_options, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL
}
};
/******** end of options list ********/
/*
* To allow continued support of obsolete names for GUC variables, we apply
* the following mappings to any unrecognized name. Note that an old name
* should be mapped to a new one only if the new variable has very similar
* semantics to the old.
*/
static const char *const map_old_guc_names[] = {
"sort_mem", "work_mem",
"vacuum_mem", "maintenance_work_mem",
NULL
};
/*
* Actual lookup of variables is done through this single, sorted array.
*/
static struct config_generic **guc_variables;
/* Current number of variables contained in the vector */
static int num_guc_variables;
/* Vector capacity */
static int size_guc_variables;
static bool guc_dirty; /* TRUE if need to do commit/abort work */
static bool reporting_enabled; /* TRUE to enable GUC_REPORT */
static int GUCNestLevel = 0; /* 1 when in main transaction */
static int guc_var_compare(const void *a, const void *b);
static int guc_name_compare(const char *namea, const char *nameb);
static void InitializeOneGUCOption(struct config_generic *gconf);
static void push_old_value(struct config_generic * gconf, GucAction action);
static void ReportGUCOption(struct config_generic * record);
static void ShowGUCConfigOption(const char *name, DestReceiver *dest);
static void ShowAllGUCConfig(DestReceiver *dest);
static char *_ShowOption(struct config_generic * record, bool use_units);
static bool is_newvalue_equal(struct config_generic * record, const char *newvalue);
/*
* Some infrastructure for checking malloc/strdup/realloc calls
*/
static void *
guc_malloc(int elevel, size_t size)
{
void *data;
data = malloc(size);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
static void *
guc_realloc(int elevel, void *old, size_t size)
{
void *data;
data = realloc(old, size);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
static char *
guc_strdup(int elevel, const char *src)
{
char *data;
data = strdup(src);
if (data == NULL)
ereport(elevel,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
return data;
}
/*
* Support for assigning to a field of a string GUC item. Free the prior
* value if it's not referenced anywhere else in the item (including stacked
* states).
*/
static void
set_string_field(struct config_string * conf, char **field, char *newval)
{
char *oldval = *field;
GucStack *stack;
/* Do the assignment */
*field = newval;
/* Exit if any duplicate references, or if old value was NULL anyway */
if (oldval == NULL ||
oldval == *(conf->variable) ||
oldval == conf->reset_val ||
oldval == conf->boot_val)
return;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (oldval == stack->prior.stringval ||
oldval == stack->masked.stringval)
return;
}
/* Not used anymore, so free it */
free(oldval);
}
/*
* Detect whether strval is referenced anywhere in a GUC string item
*/
static bool
string_field_used(struct config_string * conf, char *strval)
{
GucStack *stack;
if (strval == *(conf->variable) ||
strval == conf->reset_val ||
strval == conf->boot_val)
return true;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (strval == stack->prior.stringval ||
strval == stack->masked.stringval)
return true;
}
return false;
}
/*
* Support for copying a variable's active value into a stack entry
*/
static void
set_stack_value(struct config_generic * gconf, union config_var_value * val)
{
switch (gconf->vartype)
{
case PGC_BOOL:
val->boolval =
*((struct config_bool *) gconf)->variable;
break;
case PGC_INT:
val->intval =
*((struct config_int *) gconf)->variable;
break;
case PGC_REAL:
val->realval =
*((struct config_real *) gconf)->variable;
break;
case PGC_STRING:
/* we assume stringval is NULL if not valid */
set_string_field((struct config_string *) gconf,
&(val->stringval),
*((struct config_string *) gconf)->variable);
break;
case PGC_ENUM:
val->enumval =
*((struct config_enum *) gconf)->variable;
break;
}
}
/*
* Support for discarding a no-longer-needed value in a stack entry
*/
static void
discard_stack_value(struct config_generic * gconf, union config_var_value * val)
{
switch (gconf->vartype)
{
case PGC_BOOL:
case PGC_INT:
case PGC_REAL:
case PGC_ENUM:
/* no need to do anything */
break;
case PGC_STRING:
set_string_field((struct config_string *) gconf,
&(val->stringval),
NULL);
break;
}
}
/*
* Fetch the sorted array pointer (exported for help_config.c's use ONLY)
*/
struct config_generic **
get_guc_variables(void)
{
return guc_variables;
}
/*
* Build the sorted array. This is split out so that it could be
* re-executed after startup (eg, we could allow loadable modules to
* add vars, and then we'd need to re-sort).
*/
void
build_guc_variables(void)
{
int size_vars;
int num_vars = 0;
struct config_generic **guc_vars;
int i;
for (i = 0; ConfigureNamesBool[i].gen.name; i++)
{
struct config_bool *conf = &ConfigureNamesBool[i];
/* Rather than requiring vartype to be filled in by hand, do this: */
conf->gen.vartype = PGC_BOOL;
num_vars++;
}
for (i = 0; ConfigureNamesInt[i].gen.name; i++)
{
struct config_int *conf = &ConfigureNamesInt[i];
conf->gen.vartype = PGC_INT;
num_vars++;
}
for (i = 0; ConfigureNamesReal[i].gen.name; i++)
{
struct config_real *conf = &ConfigureNamesReal[i];
conf->gen.vartype = PGC_REAL;
num_vars++;
}
for (i = 0; ConfigureNamesString[i].gen.name; i++)
{
struct config_string *conf = &ConfigureNamesString[i];
conf->gen.vartype = PGC_STRING;
num_vars++;
}
for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
{
struct config_enum *conf = &ConfigureNamesEnum[i];
conf->gen.vartype = PGC_ENUM;
num_vars++;
}
/*
* Create table with 20% slack
*/
size_vars = num_vars + num_vars / 4;
guc_vars = (struct config_generic **)
guc_malloc(FATAL, size_vars * sizeof(struct config_generic *));
num_vars = 0;
for (i = 0; ConfigureNamesBool[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesBool[i].gen;
for (i = 0; ConfigureNamesInt[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesInt[i].gen;
for (i = 0; ConfigureNamesReal[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesReal[i].gen;
for (i = 0; ConfigureNamesString[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesString[i].gen;
for (i = 0; ConfigureNamesEnum[i].gen.name; i++)
guc_vars[num_vars++] = &ConfigureNamesEnum[i].gen;
if (guc_variables)
free(guc_variables);
guc_variables = guc_vars;
num_guc_variables = num_vars;
size_guc_variables = size_vars;
qsort((void *) guc_variables, num_guc_variables,
sizeof(struct config_generic *), guc_var_compare);
}
/*
* Add a new GUC variable to the list of known variables. The
* list is expanded if needed.
*/
static bool
add_guc_variable(struct config_generic * var, int elevel)
{
if (num_guc_variables + 1 >= size_guc_variables)
{
/*
* Increase the vector by 25%
*/
int size_vars = size_guc_variables + size_guc_variables / 4;
struct config_generic **guc_vars;
if (size_vars == 0)
{
size_vars = 100;
guc_vars = (struct config_generic **)
guc_malloc(elevel, size_vars * sizeof(struct config_generic *));
}
else
{
guc_vars = (struct config_generic **)
guc_realloc(elevel, guc_variables, size_vars * sizeof(struct config_generic *));
}
if (guc_vars == NULL)
return false; /* out of memory */
guc_variables = guc_vars;
size_guc_variables = size_vars;
}
guc_variables[num_guc_variables++] = var;
qsort((void *) guc_variables, num_guc_variables,
sizeof(struct config_generic *), guc_var_compare);
return true;
}
/*
* Create and add a placeholder variable. It's presumed to belong
* to a valid custom variable class at this point.
*/
static struct config_generic *
add_placeholder_variable(const char *name, int elevel)
{
size_t sz = sizeof(struct config_string) + sizeof(char *);
struct config_string *var;
struct config_generic *gen;
var = (struct config_string *) guc_malloc(elevel, sz);
if (var == NULL)
return NULL;
memset(var, 0, sz);
gen = &var->gen;
gen->name = guc_strdup(elevel, name);
if (gen->name == NULL)
{
free(var);
return NULL;
}
gen->context = PGC_USERSET;
gen->group = CUSTOM_OPTIONS;
gen->short_desc = "GUC placeholder variable";
gen->flags = GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_CUSTOM_PLACEHOLDER;
gen->vartype = PGC_STRING;
/*
* The char* is allocated at the end of the struct since we have no
* 'static' place to point to. Note that the current value, as well as
* the boot and reset values, start out NULL.
*/
var->variable = (char **) (var + 1);
if (!add_guc_variable((struct config_generic *) var, elevel))
{
free((void *) gen->name);
free(var);
return NULL;
}
return gen;
}
/*
* Detect whether the portion of "name" before dotPos matches any custom
* variable class name listed in custom_var_classes. The latter must be
* formatted the way that assign_custom_variable_classes does it, ie,
* no whitespace. NULL is valid for custom_var_classes.
*/
static bool
is_custom_class(const char *name, int dotPos, const char *custom_var_classes)
{
bool result = false;
const char *ccs = custom_var_classes;
if (ccs != NULL)
{
const char *start = ccs;
for (;; ++ccs)
{
char c = *ccs;
if (c == '\0' || c == ',')
{
if (dotPos == ccs - start && strncmp(start, name, dotPos) == 0)
{
result = true;
break;
}
if (c == '\0')
break;
start = ccs + 1;
}
}
}
return result;
}
/*
* Look up option NAME. If it exists, return a pointer to its record,
* else return NULL. If create_placeholders is TRUE, we'll create a
* placeholder record for a valid-looking custom variable name.
*/
static struct config_generic *
find_option(const char *name, bool create_placeholders, int elevel)
{
const char **key = &name;
struct config_generic **res;
int i;
Assert(name);
/*
* By equating const char ** with struct config_generic *, we are assuming
* the name field is first in config_generic.
*/
res = (struct config_generic **) bsearch((void *) &key,
(void *) guc_variables,
num_guc_variables,
sizeof(struct config_generic *),
guc_var_compare);
if (res)
return *res;
/*
* See if the name is an obsolete name for a variable. We assume that the
* set of supported old names is short enough that a brute-force search is
* the best way.
*/
for (i = 0; map_old_guc_names[i] != NULL; i += 2)
{
if (guc_name_compare(name, map_old_guc_names[i]) == 0)
return find_option(map_old_guc_names[i + 1], false, elevel);
}
if (create_placeholders)
{
/*
* Check if the name is qualified, and if so, check if the qualifier
* matches any custom variable class. If so, add a placeholder.
*/
const char *dot = strchr(name, GUC_QUALIFIER_SEPARATOR);
if (dot != NULL &&
is_custom_class(name, dot - name, custom_variable_classes))
return add_placeholder_variable(name, elevel);
}
/* Unknown name */
return NULL;
}
/*
* comparator for qsorting and bsearching guc_variables array
*/
static int
guc_var_compare(const void *a, const void *b)
{
struct config_generic *confa = *(struct config_generic **) a;
struct config_generic *confb = *(struct config_generic **) b;
return guc_name_compare(confa->name, confb->name);
}
/*
* the bare comparison function for GUC names
*/
static int
guc_name_compare(const char *namea, const char *nameb)
{
/*
* The temptation to use strcasecmp() here must be resisted, because the
* array ordering has to remain stable across setlocale() calls. So, build
* our own with a simple ASCII-only downcasing.
*/
while (*namea && *nameb)
{
char cha = *namea++;
char chb = *nameb++;
if (cha >= 'A' && cha <= 'Z')
cha += 'a' - 'A';
if (chb >= 'A' && chb <= 'Z')
chb += 'a' - 'A';
if (cha != chb)
return cha - chb;
}
if (*namea)
return 1; /* a is longer */
if (*nameb)
return -1; /* b is longer */
return 0;
}
/*
* Initialize GUC options during program startup.
*
* Note that we cannot read the config file yet, since we have not yet
* processed command-line switches.
*/
void
InitializeGUCOptions(void)
{
int i;
char *env;
long stack_rlimit;
/*
* Before log_line_prefix could possibly receive a nonempty setting, make
* sure that timezone processing is minimally alive (see elog.c).
*/
pg_timezone_pre_initialize();
/*
* Build sorted array of all GUC variables.
*/
build_guc_variables();
/*
* Load all variables with their compiled-in defaults, and initialize
* status fields as needed.
*/
for (i = 0; i < num_guc_variables; i++)
{
InitializeOneGUCOption(guc_variables[i]);
}
guc_dirty = false;
reporting_enabled = false;
/*
* Prevent any attempt to override the transaction modes from
* non-interactive sources.
*/
SetConfigOption("transaction_isolation", "default",
PGC_POSTMASTER, PGC_S_OVERRIDE);
SetConfigOption("transaction_read_only", "no",
PGC_POSTMASTER, PGC_S_OVERRIDE);
/*
* For historical reasons, some GUC parameters can receive defaults from
* environment variables. Process those settings. NB: if you add or
* remove anything here, see also ProcessConfigFile().
*/
env = getenv("PGPORT");
if (env != NULL)
SetConfigOption("port", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
env = getenv("PGDATESTYLE");
if (env != NULL)
SetConfigOption("datestyle", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
env = getenv("PGCLIENTENCODING");
if (env != NULL)
SetConfigOption("client_encoding", env, PGC_POSTMASTER, PGC_S_ENV_VAR);
/*
* rlimit isn't exactly an "environment variable", but it behaves about
* the same. If we can identify the platform stack depth rlimit, increase
* default stack depth setting up to whatever is safe (but at most 2MB).
*/
stack_rlimit = get_stack_depth_rlimit();
if (stack_rlimit > 0)
{
int new_limit = (stack_rlimit - STACK_DEPTH_SLOP) / 1024L;
if (new_limit > 100)
{
char limbuf[16];
new_limit = Min(new_limit, 2048);
sprintf(limbuf, "%d", new_limit);
SetConfigOption("max_stack_depth", limbuf,
PGC_POSTMASTER, PGC_S_ENV_VAR);
}
}
}
/*
* Initialize one GUC option variable to its compiled-in default.
*/
static void
InitializeOneGUCOption(struct config_generic *gconf)
{
gconf->status = 0;
gconf->reset_source = PGC_S_DEFAULT;
gconf->source = PGC_S_DEFAULT;
gconf->stack = NULL;
gconf->sourcefile = NULL;
gconf->sourceline = 0;
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %d",
conf->gen.name, (int) conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
Assert(conf->boot_val >= conf->min);
Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %d",
conf->gen.name, conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
Assert(conf->boot_val >= conf->min);
Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %g",
conf->gen.name, conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
char *str;
*conf->variable = NULL;
conf->reset_val = NULL;
if (conf->boot_val == NULL)
{
/* leave the value NULL, do not call assign hook */
break;
}
str = guc_strdup(FATAL, conf->boot_val);
conf->reset_val = str;
if (conf->assign_hook)
{
const char *newstr;
newstr = (*conf->assign_hook) (str, true,
PGC_S_DEFAULT);
if (newstr == NULL)
{
elog(FATAL, "failed to initialize %s to \"%s\"",
conf->gen.name, str);
}
else if (newstr != str)
{
free(str);
/*
* See notes in set_config_option about casting
*/
str = (char *) newstr;
conf->reset_val = str;
}
}
*conf->variable = str;
break;
}
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %s",
conf->gen.name,
config_enum_lookup_by_value(conf, conf->boot_val));
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
}
}
/*
* Select the configuration files and data directory to be used, and
* do the initial read of postgresql.conf.
*
* This is called after processing command-line switches.
* userDoption is the -D switch value if any (NULL if unspecified).
* progname is just for use in error messages.
*
* Returns true on success; on failure, prints a suitable error message
* to stderr and returns false.
*/
bool
SelectConfigFiles(const char *userDoption, const char *progname)
{
char *configdir;
char *fname;
struct stat stat_buf;
/* configdir is -D option, or $PGDATA if no -D */
if (userDoption)
configdir = make_absolute_path(userDoption);
else
configdir = make_absolute_path(getenv("PGDATA"));
/*
* Find the configuration file: if config_file was specified on the
* command line, use it, else use configdir/postgresql.conf. In any case
* ensure the result is an absolute path, so that it will be interpreted
* the same way by future backends.
*/
if (ConfigFileName)
fname = make_absolute_path(ConfigFileName);
else if (configdir)
{
fname = guc_malloc(FATAL,
strlen(configdir) + strlen(CONFIG_FILENAME) + 2);
sprintf(fname, "%s/%s", configdir, CONFIG_FILENAME);
}
else
{
write_stderr("%s does not know where to find the server configuration file.\n"
"You must specify the --config-file or -D invocation "
"option or set the PGDATA environment variable.\n",
progname);
return false;
}
/*
* Set the ConfigFileName GUC variable to its final value, ensuring that
* it can't be overridden later.
*/
SetConfigOption("config_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
free(fname);
/*
* Now read the config file for the first time.
*/
if (stat(ConfigFileName, &stat_buf) != 0)
{
write_stderr("%s cannot access the server configuration file \"%s\": %s\n",
progname, ConfigFileName, strerror(errno));
return false;
}
ProcessConfigFile(PGC_POSTMASTER);
/*
* If the data_directory GUC variable has been set, use that as DataDir;
* otherwise use configdir if set; else punt.
*
* Note: SetDataDir will copy and absolute-ize its argument, so we don't
* have to.
*/
if (data_directory)
SetDataDir(data_directory);
else if (configdir)
SetDataDir(configdir);
else
{
write_stderr("%s does not know where to find the database system data.\n"
"This can be specified as \"data_directory\" in \"%s\", "
"or by the -D invocation option, or by the "
"PGDATA environment variable.\n",
progname, ConfigFileName);
return false;
}
/*
* Reflect the final DataDir value back into the data_directory GUC var.
* (If you are wondering why we don't just make them a single variable,
* it's because the EXEC_BACKEND case needs DataDir to be transmitted to
* child backends specially. XXX is that still true? Given that we now
* chdir to DataDir, EXEC_BACKEND can read the config file without knowing
* DataDir in advance.)
*/
SetConfigOption("data_directory", DataDir, PGC_POSTMASTER, PGC_S_OVERRIDE);
/*
* Figure out where pg_hba.conf is, and make sure the path is absolute.
*/
if (HbaFileName)
fname = make_absolute_path(HbaFileName);
else if (configdir)
{
fname = guc_malloc(FATAL,
strlen(configdir) + strlen(HBA_FILENAME) + 2);
sprintf(fname, "%s/%s", configdir, HBA_FILENAME);
}
else
{
write_stderr("%s does not know where to find the \"hba\" configuration file.\n"
"This can be specified as \"hba_file\" in \"%s\", "
"or by the -D invocation option, or by the "
"PGDATA environment variable.\n",
progname, ConfigFileName);
return false;
}
SetConfigOption("hba_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
free(fname);
/*
* Likewise for pg_ident.conf.
*/
if (IdentFileName)
fname = make_absolute_path(IdentFileName);
else if (configdir)
{
fname = guc_malloc(FATAL,
strlen(configdir) + strlen(IDENT_FILENAME) + 2);
sprintf(fname, "%s/%s", configdir, IDENT_FILENAME);
}
else
{
write_stderr("%s does not know where to find the \"ident\" configuration file.\n"
"This can be specified as \"ident_file\" in \"%s\", "
"or by the -D invocation option, or by the "
"PGDATA environment variable.\n",
progname, ConfigFileName);
return false;
}
SetConfigOption("ident_file", fname, PGC_POSTMASTER, PGC_S_OVERRIDE);
free(fname);
free(configdir);
return true;
}
/*
* Reset all options to their saved default values (implements RESET ALL)
*/
void
ResetAllOptions(void)
{
int i;
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
/* Don't reset non-SET-able values */
if (gconf->context != PGC_SUSET &&
gconf->context != PGC_USERSET)
continue;
/* Don't reset if special exclusion from RESET ALL */
if (gconf->flags & GUC_NO_RESET_ALL)
continue;
/* No need to reset if wasn't SET */
if (gconf->source <= PGC_S_OVERRIDE)
continue;
/* Save old value to support transaction abort */
push_old_value(gconf, GUC_ACTION_SET);
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
PGC_S_SESSION))
elog(ERROR, "failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
PGC_S_SESSION))
elog(ERROR, "failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
PGC_S_SESSION))
elog(ERROR, "failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
char *str;
/* We need not strdup here */
str = conf->reset_val;
if (conf->assign_hook && str)
{
const char *newstr;
newstr = (*conf->assign_hook) (str, true,
PGC_S_SESSION);
if (newstr == NULL)
elog(ERROR, "failed to reset %s", conf->gen.name);
else if (newstr != str)
{
/*
* See notes in set_config_option about casting
*/
str = (char *) newstr;
}
}
set_string_field(conf, conf->variable, str);
break;
}
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
PGC_S_SESSION))
elog(ERROR, "failed to reset %s", conf->gen.name);
*conf->variable = conf->reset_val;
break;
}
}
gconf->source = gconf->reset_source;
if (gconf->flags & GUC_REPORT)
ReportGUCOption(gconf);
}
}
/*
* push_old_value
* Push previous state during transactional assignment to a GUC variable.
*/
static void
push_old_value(struct config_generic * gconf, GucAction action)
{
GucStack *stack;
/* If we're not inside a nest level, do nothing */
if (GUCNestLevel == 0)
return;
/* Do we already have a stack entry of the current nest level? */
stack = gconf->stack;
if (stack && stack->nest_level >= GUCNestLevel)
{
/* Yes, so adjust its state if necessary */
Assert(stack->nest_level == GUCNestLevel);
switch (action)
{
case GUC_ACTION_SET:
/* SET overrides any prior action at same nest level */
if (stack->state == GUC_SET_LOCAL)
{
/* must discard old masked value */
discard_stack_value(gconf, &stack->masked);
}
stack->state = GUC_SET;
break;
case GUC_ACTION_LOCAL:
if (stack->state == GUC_SET)
{
/* SET followed by SET LOCAL, remember SET's value */
set_stack_value(gconf, &stack->masked);
stack->state = GUC_SET_LOCAL;
}
/* in all other cases, no change to stack entry */
break;
case GUC_ACTION_SAVE:
/* Could only have a prior SAVE of same variable */
Assert(stack->state == GUC_SAVE);
break;
}
Assert(guc_dirty); /* must be set already */
return;
}
/*
* Push a new stack entry
*
* We keep all the stack entries in TopTransactionContext for simplicity.
*/
stack = (GucStack *) MemoryContextAllocZero(TopTransactionContext,
sizeof(GucStack));
stack->prev = gconf->stack;
stack->nest_level = GUCNestLevel;
switch (action)
{
case GUC_ACTION_SET:
stack->state = GUC_SET;
break;
case GUC_ACTION_LOCAL:
stack->state = GUC_LOCAL;
break;
case GUC_ACTION_SAVE:
stack->state = GUC_SAVE;
break;
}
stack->source = gconf->source;
set_stack_value(gconf, &stack->prior);
gconf->stack = stack;
/* Ensure we remember to pop at end of xact */
guc_dirty = true;
}
/*
* Do GUC processing at main transaction start.
*/
void
AtStart_GUC(void)
{
/*
* The nest level should be 0 between transactions; if it isn't, somebody
* didn't call AtEOXact_GUC, or called it with the wrong nestLevel. We
* throw a warning but make no other effort to clean up.
*/
if (GUCNestLevel != 0)
elog(WARNING, "GUC nest level = %d at transaction start",
GUCNestLevel);
GUCNestLevel = 1;
}
/*
* Enter a new nesting level for GUC values. This is called at subtransaction
* start and when entering a function that has proconfig settings. NOTE that
* we must not risk error here, else subtransaction start will be unhappy.
*/
int
NewGUCNestLevel(void)
{
return ++GUCNestLevel;
}
/*
* Do GUC processing at transaction or subtransaction commit or abort, or
* when exiting a function that has proconfig settings. (The name is thus
* a bit of a misnomer; perhaps it should be ExitGUCNestLevel or some such.)
* During abort, we discard all GUC settings that were applied at nesting
* levels >= nestLevel. nestLevel == 1 corresponds to the main transaction.
*/
void
AtEOXact_GUC(bool isCommit, int nestLevel)
{
bool still_dirty;
int i;
Assert(nestLevel > 0 && nestLevel <= GUCNestLevel);
/* Quick exit if nothing's changed in this transaction */
if (!guc_dirty)
{
GUCNestLevel = nestLevel - 1;
return;
}
still_dirty = false;
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
GucStack *stack;
/*
* Process and pop each stack entry within the nest level. To
* simplify fmgr_security_definer(), we allow failure exit from a
* function-with-SET-options to be recovered at the surrounding
* transaction or subtransaction abort; so there could be more than
* one stack entry to pop.
*/
while ((stack = gconf->stack) != NULL &&
stack->nest_level >= nestLevel)
{
GucStack *prev = stack->prev;
bool restorePrior = false;
bool restoreMasked = false;
bool changed;
/*
* In this next bit, if we don't set either restorePrior or
* restoreMasked, we must "discard" any unwanted fields of the
* stack entries to avoid leaking memory. If we do set one of
* those flags, unused fields will be cleaned up after restoring.
*/
if (!isCommit) /* if abort, always restore prior value */
restorePrior = true;
else if (stack->state == GUC_SAVE)
restorePrior = true;
else if (stack->nest_level == 1)
{
/* transaction commit */
if (stack->state == GUC_SET_LOCAL)
restoreMasked = true;
else if (stack->state == GUC_SET)
{
/* we keep the current active value */
discard_stack_value(gconf, &stack->prior);
}
else /* must be GUC_LOCAL */
restorePrior = true;
}
else if (prev == NULL ||
prev->nest_level < stack->nest_level - 1)
{
/* decrement entry's level and do not pop it */
stack->nest_level--;
continue;
}
else
{
/*
* We have to merge this stack entry into prev. See README for
* discussion of this bit.
*/
switch (stack->state)
{
case GUC_SAVE:
Assert(false); /* can't get here */
case GUC_SET:
/* next level always becomes SET */
discard_stack_value(gconf, &stack->prior);
if (prev->state == GUC_SET_LOCAL)
discard_stack_value(gconf, &prev->masked);
prev->state = GUC_SET;
break;
case GUC_LOCAL:
if (prev->state == GUC_SET)
{
/* LOCAL migrates down */
prev->masked = stack->prior;
prev->state = GUC_SET_LOCAL;
}
else
{
/* else just forget this stack level */
discard_stack_value(gconf, &stack->prior);
}
break;
case GUC_SET_LOCAL:
/* prior state at this level no longer wanted */
discard_stack_value(gconf, &stack->prior);
/* copy down the masked state */
if (prev->state == GUC_SET_LOCAL)
discard_stack_value(gconf, &prev->masked);
prev->masked = stack->masked;
prev->state = GUC_SET_LOCAL;
break;
}
}
changed = false;
if (restorePrior || restoreMasked)
{
/* Perform appropriate restoration of the stacked value */
union config_var_value newvalue;
GucSource newsource;
if (restoreMasked)
{
newvalue = stack->masked;
newsource = PGC_S_SESSION;
}
else
{
newvalue = stack->prior;
newsource = stack->source;
}
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
bool newval = newvalue.boolval;
if (*conf->variable != newval)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval,
true, PGC_S_OVERRIDE))
elog(LOG, "failed to commit %s",
conf->gen.name);
*conf->variable = newval;
changed = true;
}
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
int newval = newvalue.intval;
if (*conf->variable != newval)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval,
true, PGC_S_OVERRIDE))
elog(LOG, "failed to commit %s",
conf->gen.name);
*conf->variable = newval;
changed = true;
}
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
double newval = newvalue.realval;
if (*conf->variable != newval)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval,
true, PGC_S_OVERRIDE))
elog(LOG, "failed to commit %s",
conf->gen.name);
*conf->variable = newval;
changed = true;
}
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
char *newval = newvalue.stringval;
if (*conf->variable != newval)
{
if (conf->assign_hook && newval)
{
const char *newstr;
newstr = (*conf->assign_hook) (newval, true,
PGC_S_OVERRIDE);
if (newstr == NULL)
elog(LOG, "failed to commit %s",
conf->gen.name);
else if (newstr != newval)
{
/*
* If newval should now be freed,
* it'll be taken care of below.
*
* See notes in set_config_option
* about casting
*/
newval = (char *) newstr;
}
}
set_string_field(conf, conf->variable, newval);
changed = true;
}
/*
* Release stacked values if not used anymore. We
* could use discard_stack_value() here, but since
* we have type-specific code anyway, might as
* well inline it.
*/
set_string_field(conf, &stack->prior.stringval, NULL);
set_string_field(conf, &stack->masked.stringval, NULL);
break;
}
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) gconf;
int newval = newvalue.enumval;
if (*conf->variable != newval)
{
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval,
true, PGC_S_OVERRIDE))
elog(LOG, "failed to commit %s",
conf->gen.name);
*conf->variable = newval;
changed = true;
}
break;
}
}
gconf->source = newsource;
}
/* Finish popping the state stack */
gconf->stack = prev;
pfree(stack);
/* Report new value if we changed it */
if (changed && (gconf->flags & GUC_REPORT))
ReportGUCOption(gconf);
} /* end of stack-popping loop */
if (stack != NULL)
still_dirty = true;
}
/* If there are no remaining stack entries, we can reset guc_dirty */
guc_dirty = still_dirty;
/* Update nesting level */
GUCNestLevel = nestLevel - 1;
}
/*
* Start up automatic reporting of changes to variables marked GUC_REPORT.
* This is executed at completion of backend startup.
*/
void
BeginReportingGUCOptions(void)
{
int i;
/*
* Don't do anything unless talking to an interactive frontend of protocol
* 3.0 or later.
*/
if (whereToSendOutput != DestRemote ||
PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
return;
reporting_enabled = true;
/* Transmit initial values of interesting variables */
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *conf = guc_variables[i];
if (conf->flags & GUC_REPORT)
ReportGUCOption(conf);
}
}
/*
* ReportGUCOption: if appropriate, transmit option value to frontend
*/
static void
ReportGUCOption(struct config_generic * record)
{
if (reporting_enabled && (record->flags & GUC_REPORT))
{
char *val = _ShowOption(record, false);
StringInfoData msgbuf;
pq_beginmessage(&msgbuf, 'S');
pq_sendstring(&msgbuf, record->name);
pq_sendstring(&msgbuf, val);
pq_endmessage(&msgbuf);
pfree(val);
}
}
/*
* Try to interpret value as boolean value. Valid values are: true,
* false, yes, no, on, off, 1, 0; as well as unique prefixes thereof.
* If the string parses okay, return true, else false.
* If okay and result is not NULL, return the value in *result.
*/
bool
parse_bool(const char *value, bool *result)
{
size_t len = strlen(value);
if (pg_strncasecmp(value, "true", len) == 0)
{
if (result)
*result = true;
}
else if (pg_strncasecmp(value, "false", len) == 0)
{
if (result)
*result = false;
}
else if (pg_strncasecmp(value, "yes", len) == 0)
{
if (result)
*result = true;
}
else if (pg_strncasecmp(value, "no", len) == 0)
{
if (result)
*result = false;
}
/* 'o' is not unique enough */
else if (pg_strncasecmp(value, "on", (len > 2 ? len : 2)) == 0)
{
if (result)
*result = true;
}
else if (pg_strncasecmp(value, "off", (len > 2 ? len : 2)) == 0)
{
if (result)
*result = false;
}
else if (pg_strcasecmp(value, "1") == 0)
{
if (result)
*result = true;
}
else if (pg_strcasecmp(value, "0") == 0)
{
if (result)
*result = false;
}
else
{
if (result)
*result = false; /* suppress compiler warning */
return false;
}
return true;
}
/*
* Try to parse value as an integer. The accepted formats are the
* usual decimal, octal, or hexadecimal formats, optionally followed by
* a unit name if "flags" indicates a unit is allowed.
*
* If the string parses okay, return true, else false.
* If okay and result is not NULL, return the value in *result.
* If not okay and hintmsg is not NULL, *hintmsg is set to a suitable
* HINT message, or NULL if no hint provided.
*/
bool
parse_int(const char *value, int *result, int flags, const char **hintmsg)
{
int64 val;
char *endptr;
/* To suppress compiler warnings, always set output params */
if (result)
*result = 0;
if (hintmsg)
*hintmsg = NULL;
/* We assume here that int64 is at least as wide as long */
errno = 0;
val = strtol(value, &endptr, 0);
if (endptr == value)
return false; /* no HINT for integer syntax error */
if (errno == ERANGE || val != (int64) ((int32) val))
{
if (hintmsg)
*hintmsg = gettext_noop("Value exceeds integer range.");
return false;
}
/* allow whitespace between integer and unit */
while (isspace((unsigned char) *endptr))
endptr++;
/* Handle possible unit */
if (*endptr != '\0')
{
/*
* Note: the multiple-switch coding technique here is a bit tedious,
* but seems necessary to avoid intermediate-value overflows.
*
* If INT64_IS_BUSTED (ie, it's really int32) we will fail to detect
* overflow due to units conversion, but there are few enough such
* machines that it does not seem worth trying to be smarter.
*/
if (flags & GUC_UNIT_MEMORY)
{
/* Set hint for use if no match or trailing garbage */
if (hintmsg)
*hintmsg = gettext_noop("Valid units for this parameter are \"kB\", \"MB\", and \"GB\".");
#if BLCKSZ < 1024 || BLCKSZ > (1024*1024)
#error BLCKSZ must be between 1KB and 1MB
#endif
#if XLOG_BLCKSZ < 1024 || XLOG_BLCKSZ > (1024*1024)
#error XLOG_BLCKSZ must be between 1KB and 1MB
#endif
if (strncmp(endptr, "kB", 2) == 0)
{
endptr += 2;
switch (flags & GUC_UNIT_MEMORY)
{
case GUC_UNIT_BLOCKS:
val /= (BLCKSZ / 1024);
break;
case GUC_UNIT_XBLOCKS:
val /= (XLOG_BLCKSZ / 1024);
break;
}
}
else if (strncmp(endptr, "MB", 2) == 0)
{
endptr += 2;
switch (flags & GUC_UNIT_MEMORY)
{
case GUC_UNIT_KB:
val *= KB_PER_MB;
break;
case GUC_UNIT_BLOCKS:
val *= KB_PER_MB / (BLCKSZ / 1024);
break;
case GUC_UNIT_XBLOCKS:
val *= KB_PER_MB / (XLOG_BLCKSZ / 1024);
break;
}
}
else if (strncmp(endptr, "GB", 2) == 0)
{
endptr += 2;
switch (flags & GUC_UNIT_MEMORY)
{
case GUC_UNIT_KB:
val *= KB_PER_GB;
break;
case GUC_UNIT_BLOCKS:
val *= KB_PER_GB / (BLCKSZ / 1024);
break;
case GUC_UNIT_XBLOCKS:
val *= KB_PER_GB / (XLOG_BLCKSZ / 1024);
break;
}
}
}
else if (flags & GUC_UNIT_TIME)
{
/* Set hint for use if no match or trailing garbage */
if (hintmsg)
*hintmsg = gettext_noop("Valid units for this parameter are \"ms\", \"s\", \"min\", \"h\", and \"d\".");
if (strncmp(endptr, "ms", 2) == 0)
{
endptr += 2;
switch (flags & GUC_UNIT_TIME)
{
case GUC_UNIT_S:
val /= MS_PER_S;
break;
case GUC_UNIT_MIN:
val /= MS_PER_MIN;
break;
}
}
else if (strncmp(endptr, "s", 1) == 0)
{
endptr += 1;
switch (flags & GUC_UNIT_TIME)
{
case GUC_UNIT_MS:
val *= MS_PER_S;
break;
case GUC_UNIT_MIN:
val /= S_PER_MIN;
break;
}
}
else if (strncmp(endptr, "min", 3) == 0)
{
endptr += 3;
switch (flags & GUC_UNIT_TIME)
{
case GUC_UNIT_MS:
val *= MS_PER_MIN;
break;
case GUC_UNIT_S:
val *= S_PER_MIN;
break;
}
}
else if (strncmp(endptr, "h", 1) == 0)
{
endptr += 1;
switch (flags & GUC_UNIT_TIME)
{
case GUC_UNIT_MS:
val *= MS_PER_H;
break;
case GUC_UNIT_S:
val *= S_PER_H;
break;
case GUC_UNIT_MIN:
val *= MIN_PER_H;
break;
}
}
else if (strncmp(endptr, "d", 1) == 0)
{
endptr += 1;
switch (flags & GUC_UNIT_TIME)
{
case GUC_UNIT_MS:
val *= MS_PER_D;
break;
case GUC_UNIT_S:
val *= S_PER_D;
break;
case GUC_UNIT_MIN:
val *= MIN_PER_D;
break;
}
}
}
/* allow whitespace after unit */
while (isspace((unsigned char) *endptr))
endptr++;
if (*endptr != '\0')
return false; /* appropriate hint, if any, already set */
/* Check for overflow due to units conversion */
if (val != (int64) ((int32) val))
{
if (hintmsg)
*hintmsg = gettext_noop("Value exceeds integer range.");
return false;
}
}
if (result)
*result = (int) val;
return true;
}
/*
* Try to parse value as a floating point number in the usual format.
* If the string parses okay, return true, else false.
* If okay and result is not NULL, return the value in *result.
*/
bool
parse_real(const char *value, double *result)
{
double val;
char *endptr;
if (result)
*result = 0; /* suppress compiler warning */
errno = 0;
val = strtod(value, &endptr);
if (endptr == value || errno == ERANGE)
return false;
/* allow whitespace after number */
while (isspace((unsigned char) *endptr))
endptr++;
if (*endptr != '\0')
return false;
if (result)
*result = val;
return true;
}
/*
* Lookup the name for an enum option with the selected value.
* Should only ever be called with known-valid values, so throws
* an elog(ERROR) if the enum option is not found.
*
* The returned string is a pointer to static data and not
* allocated for modification.
*/
const char *
config_enum_lookup_by_value(struct config_enum *record, int val)
{
const struct config_enum_entry *entry;
for (entry = record->options; entry && entry->name; entry++)
{
if (entry->val == val)
return entry->name;
}
elog(ERROR, "could not find enum option %d for %s",
val, record->gen.name);
return NULL; /* silence compiler */
}
/*
* Lookup the value for an enum option with the selected name
* (case-insensitive).
* If the enum option is found, sets the retval value and returns
* true. If it's not found, return FALSE and retval is set to 0.
*/
bool
config_enum_lookup_by_name(struct config_enum *record, const char *value,
int *retval)
{
const struct config_enum_entry *entry;
for (entry = record->options; entry && entry->name; entry++)
{
if (pg_strcasecmp(value, entry->name) == 0)
{
*retval = entry->val;
return TRUE;
}
}
*retval = 0;
return FALSE;
}
/*
* Return a list of all available options for an enum, excluding
* hidden ones, separated by the given separator.
* If prefix is non-NULL, it is added before the first enum value.
* If suffix is non-NULL, it is added to the end of the string.
*/
static char *
config_enum_get_options(struct config_enum *record, const char *prefix,
const char *suffix, const char *separator)
{
const struct config_enum_entry *entry;
StringInfoData retstr;
int seplen;
initStringInfo(&retstr);
appendStringInfoString(&retstr, prefix);
seplen = strlen(separator);
for (entry = record->options; entry && entry->name; entry++)
{
if (!entry->hidden)
{
appendStringInfoString(&retstr, entry->name);
appendBinaryStringInfo(&retstr, separator, seplen);
}
}
/*
* All the entries may have been hidden, leaving the string empty
* if no prefix was given. This indicates a broken GUC setup, since
* there is no use for an enum without any values, so we just check
* to make sure we don't write to invalid memory instead of actually
* trying to do something smart with it.
*/
if (retstr.len >= seplen)
{
/* Replace final separator */
retstr.data[retstr.len - seplen] = '\0';
retstr.len -= seplen;
}
appendStringInfoString(&retstr, suffix);
return retstr.data;
}
/*
* Call a GucStringAssignHook function, being careful to free the
* "newval" string if the hook ereports.
*
* This is split out of set_config_option just to avoid the "volatile"
* qualifiers that would otherwise have to be plastered all over.
*/
static const char *
call_string_assign_hook(GucStringAssignHook assign_hook,
char *newval, bool doit, GucSource source)
{
const char *result;
PG_TRY();
{
result = (*assign_hook) (newval, doit, source);
}
PG_CATCH();
{
free(newval);
PG_RE_THROW();
}
PG_END_TRY();
return result;
}
/*
* Sets option `name' to given value. The value should be a string
* which is going to be parsed and converted to the appropriate data
* type. The context and source parameters indicate in which context this
* function is being called so it can apply the access restrictions
* properly.
*
* If value is NULL, set the option to its default value (normally the
* reset_val, but if source == PGC_S_DEFAULT we instead use the boot_val).
*
* action indicates whether to set the value globally in the session, locally
* to the current top transaction, or just for the duration of a function call.
*
* If changeVal is false then don't really set the option but do all
* the checks to see if it would work.
*
* If there is an error (non-existing option, invalid value) then an
* ereport(ERROR) is thrown *unless* this is called in a context where we
* don't want to ereport (currently, startup or SIGHUP config file reread).
* In that case we write a suitable error message via ereport(LOG) and
* return false. This is working around the deficiencies in the ereport
* mechanism, so don't blame me. In all other cases, the function
* returns true, including cases where the input is valid but we chose
* not to apply it because of context or source-priority considerations.
*
* See also SetConfigOption for an external interface.
*/
bool
set_config_option(const char *name, const char *value,
GucContext context, GucSource source,
GucAction action, bool changeVal)
{
struct config_generic *record;
int elevel;
bool makeDefault;
if (context == PGC_SIGHUP || source == PGC_S_DEFAULT)
{
/*
* To avoid cluttering the log, only the postmaster bleats loudly
* about problems with the config file.
*/
elevel = IsUnderPostmaster ? DEBUG3 : LOG;
}
else if (source == PGC_S_DATABASE || source == PGC_S_USER)
elevel = INFO;
else
elevel = ERROR;
record = find_option(name, true, elevel);
if (record == NULL)
{
ereport(elevel,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
return false;
}
/*
* If source is postgresql.conf, mark the found record with
* GUC_IS_IN_FILE. This is for the convenience of ProcessConfigFile. Note
* that we do it even if changeVal is false, since ProcessConfigFile wants
* the marking to occur during its testing pass.
*/
if (source == PGC_S_FILE)
record->status |= GUC_IS_IN_FILE;
/*
* Check if the option can be set at this time. See guc.h for the precise
* rules. Note that we don't want to throw errors if we're in the SIGHUP
* context. In that case we just ignore the attempt and return true.
*/
switch (record->context)
{
case PGC_INTERNAL:
if (context == PGC_SIGHUP)
return true;
if (context != PGC_INTERNAL)
{
ereport(elevel,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed",
name)));
return false;
}
break;
case PGC_POSTMASTER:
if (context == PGC_SIGHUP)
{
/*
* We are reading a PGC_POSTMASTER var from postgresql.conf.
* We can't change the setting, so give a warning if the DBA
* tries to change it. (Throwing an error would be more
* consistent, but seems overly rigid.)
*/
if (changeVal && !is_newvalue_equal(record, value))
ereport(elevel,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("attempted change of parameter \"%s\" ignored",
name),
errdetail("This parameter cannot be changed after server start.")));
return true;
}
if (context != PGC_POSTMASTER)
{
ereport(elevel,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("attempted change of parameter \"%s\" ignored",
name),
errdetail("This parameter cannot be changed after server start.")));
return false;
}
break;
case PGC_SIGHUP:
if (context != PGC_SIGHUP && context != PGC_POSTMASTER)
{
ereport(elevel,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed now",
name)));
return false;
}
/*
* Hmm, the idea of the SIGHUP context is "ought to be global, but
* can be changed after postmaster start". But there's nothing
* that prevents a crafty administrator from sending SIGHUP
* signals to individual backends only.
*/
break;
case PGC_BACKEND:
if (context == PGC_SIGHUP)
{
/*
* If a PGC_BACKEND parameter is changed in the config file,
* we want to accept the new value in the postmaster (whence
* it will propagate to subsequently-started backends), but
* ignore it in existing backends. This is a tad klugy, but
* necessary because we don't re-read the config file during
* backend start.
*/
if (IsUnderPostmaster)
return true;
}
else if (context != PGC_BACKEND && context != PGC_POSTMASTER)
{
ereport(elevel,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be set after connection start",
name)));
return false;
}
break;
case PGC_SUSET:
if (context == PGC_USERSET || context == PGC_BACKEND)
{
ereport(elevel,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to set parameter \"%s\"",
name)));
return false;
}
break;
case PGC_USERSET:
/* always okay */
break;
}
/*
* Should we set reset/stacked values? (If so, the behavior is not
* transactional.) This is done either when we get a default value from
* the database's/user's/client's default settings or when we reset a
* value to its default.
*/
makeDefault = changeVal && (source <= PGC_S_OVERRIDE) &&
((value != NULL) || source == PGC_S_DEFAULT);
/*
* Ignore attempted set if overridden by previously processed setting.
* However, if changeVal is false then plow ahead anyway since we are
* trying to find out if the value is potentially good, not actually use
* it. Also keep going if makeDefault is true, since we may want to set
* the reset/stacked values even if we can't set the variable itself.
*/
if (record->source > source)
{
if (changeVal && !makeDefault)
{
elog(DEBUG3, "\"%s\": setting ignored because previous source is higher priority",
name);
return true;
}
changeVal = false;
}
/*
* Evaluate value and set variable.
*/
switch (record->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) record;
bool newval;
if (value)
{
if (!parse_bool(value, &newval))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("parameter \"%s\" requires a Boolean value",
name)));
return false;
}
}
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
/* Save old value to support transaction abort */
if (changeVal && !makeDefault)
push_old_value(&conf->gen, action);
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, changeVal, source))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": %d",
name, (int) newval)));
return false;
}
if (changeVal)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
GucStack *stack;
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (stack->source <= source)
{
stack->prior.boolval = newval;
stack->source = source;
}
}
}
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) record;
int newval;
if (value)
{
const char *hintmsg;
if (!parse_int(value, &newval, conf->gen.flags, &hintmsg))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": \"%s\"",
name, value),
hintmsg ? errhint("%s", hintmsg) : 0));
return false;
}
if (newval < conf->min || newval > conf->max)
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("%d is outside the valid range for parameter \"%s\" (%d .. %d)",
newval, name, conf->min, conf->max)));
return false;
}
}
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
/* Save old value to support transaction abort */
if (changeVal && !makeDefault)
push_old_value(&conf->gen, action);
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, changeVal, source))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": %d",
name, newval)));
return false;
}
if (changeVal)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
GucStack *stack;
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (stack->source <= source)
{
stack->prior.intval = newval;
stack->source = source;
}
}
}
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) record;
double newval;
if (value)
{
if (!parse_real(value, &newval))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("parameter \"%s\" requires a numeric value",
name)));
return false;
}
if (newval < conf->min || newval > conf->max)
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("%g is outside the valid range for parameter \"%s\" (%g .. %g)",
newval, name, conf->min, conf->max)));
return false;
}
}
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
/* Save old value to support transaction abort */
if (changeVal && !makeDefault)
push_old_value(&conf->gen, action);
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, changeVal, source))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": %g",
name, newval)));
return false;
}
if (changeVal)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
GucStack *stack;
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (stack->source <= source)
{
stack->prior.realval = newval;
stack->source = source;
}
}
}
break;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) record;
char *newval;
if (value)
{
newval = guc_strdup(elevel, value);
if (newval == NULL)
return false;
/*
* The only sort of "parsing" check we need to do is apply
* truncation if GUC_IS_NAME.
*/
if (conf->gen.flags & GUC_IS_NAME)
truncate_identifier(newval, strlen(newval), true);
}
else if (source == PGC_S_DEFAULT)
{
if (conf->boot_val == NULL)
newval = NULL;
else
{
newval = guc_strdup(elevel, conf->boot_val);
if (newval == NULL)
return false;
}
}
else
{
/*
* We could possibly avoid strdup here, but easier to make
* this case work the same as the normal assignment case;
* note the possible free of newval below.
*/
if (conf->reset_val == NULL)
newval = NULL;
else
{
newval = guc_strdup(elevel, conf->reset_val);
if (newval == NULL)
return false;
}
source = conf->gen.reset_source;
}
/* Save old value to support transaction abort */
if (changeVal && !makeDefault)
push_old_value(&conf->gen, action);
if (conf->assign_hook && newval)
{
const char *hookresult;
/*
* If the hook ereports, we have to make sure we free
* newval, else it will be a permanent memory leak.
*/
hookresult = call_string_assign_hook(conf->assign_hook,
newval,
changeVal,
source);
if (hookresult == NULL)
{
free(newval);
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": \"%s\"",
name, value ? value : "")));
return false;
}
else if (hookresult != newval)
{
free(newval);
/*
* Having to cast away const here is annoying, but the
* alternative is to declare assign_hooks as returning
* char*, which would mean they'd have to cast away
* const, or as both taking and returning char*, which
* doesn't seem attractive either --- we don't want
* them to scribble on the passed str.
*/
newval = (char *) hookresult;
}
}
if (changeVal)
{
set_string_field(conf, conf->variable, newval);
conf->gen.source = source;
}
if (makeDefault)
{
GucStack *stack;
if (conf->gen.reset_source <= source)
{
set_string_field(conf, &conf->reset_val, newval);
conf->gen.reset_source = source;
}
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (stack->source <= source)
{
set_string_field(conf, &stack->prior.stringval,
newval);
stack->source = source;
}
}
}
/* Perhaps we didn't install newval anywhere */
if (newval && !string_field_used(conf, newval))
free(newval);
break;
}
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) record;
int newval;
if (value)
{
if (!config_enum_lookup_by_name(conf, value, &newval))
{
char *hintmsg;
hintmsg = config_enum_get_options(conf,
"Available values: ",
".", ", ");
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": \"%s\"",
name, value),
hintmsg ? errhint("%s", hintmsg) : 0));
if (hintmsg)
pfree(hintmsg);
return false;
}
}
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
else
{
newval = conf->reset_val;
source = conf->gen.reset_source;
}
/* Save old value to support transaction abort */
if (changeVal && !makeDefault)
push_old_value(&conf->gen, action);
if (conf->assign_hook)
if (!(*conf->assign_hook) (newval, changeVal, source))
{
ereport(elevel,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid value for parameter \"%s\": \"%s\"",
name,
config_enum_lookup_by_value(conf, newval))));
return false;
}
if (changeVal)
{
*conf->variable = newval;
conf->gen.source = source;
}
if (makeDefault)
{
GucStack *stack;
if (conf->gen.reset_source <= source)
{
conf->reset_val = newval;
conf->gen.reset_source = source;
}
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
if (stack->source <= source)
{
stack->prior.enumval = newval;
stack->source = source;
}
}
}
break;
}
}
if (changeVal && (record->flags & GUC_REPORT))
ReportGUCOption(record);
return true;
}
/*
* Set the fields for source file and line number the setting came from.
*/
static void
set_config_sourcefile(const char *name, char *sourcefile, int sourceline)
{
struct config_generic *record;
int elevel;
/*
* To avoid cluttering the log, only the postmaster bleats loudly
* about problems with the config file.
*/
elevel = IsUnderPostmaster ? DEBUG3 : LOG;
record = find_option(name, true, elevel);
/* should not happen */
if (record == NULL)
elog(ERROR, "unrecognized configuration parameter \"%s\"", name);
sourcefile = guc_strdup(elevel, sourcefile);
if (record->sourcefile)
free(record->sourcefile);
record->sourcefile = sourcefile;
record->sourceline = sourceline;
}
/*
* Set a config option to the given value. See also set_config_option,
* this is just the wrapper to be called from outside GUC. NB: this
* is used only for non-transactional operations.
*
* Note: there is no support here for setting source file/line, as it
* is currently not needed.
*/
void
SetConfigOption(const char *name, const char *value,
GucContext context, GucSource source)
{
(void) set_config_option(name, value, context, source,
GUC_ACTION_SET, true);
}
/*
* Fetch the current value of the option `name'. If the option doesn't exist,
* throw an ereport and don't return.
*
* The string is *not* allocated for modification and is really only
* valid until the next call to configuration related functions.
*/
const char *
GetConfigOption(const char *name)
{
struct config_generic *record;
static char buffer[256];
record = find_option(name, false, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to examine \"%s\"", name)));
switch (record->vartype)
{
case PGC_BOOL:
return *((struct config_bool *) record)->variable ? "on" : "off";
case PGC_INT:
snprintf(buffer, sizeof(buffer), "%d",
*((struct config_int *) record)->variable);
return buffer;
case PGC_REAL:
snprintf(buffer, sizeof(buffer), "%g",
*((struct config_real *) record)->variable);
return buffer;
case PGC_STRING:
return *((struct config_string *) record)->variable;
case PGC_ENUM:
return config_enum_lookup_by_value((struct config_enum *) record,
*((struct config_enum *) record)->variable);
}
return NULL;
}
/*
* Get the RESET value associated with the given option.
*
* Note: this is not re-entrant, due to use of static result buffer;
* not to mention that a string variable could have its reset_val changed.
* Beware of assuming the result value is good for very long.
*/
const char *
GetConfigOptionResetString(const char *name)
{
struct config_generic *record;
static char buffer[256];
record = find_option(name, false, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to examine \"%s\"", name)));
switch (record->vartype)
{
case PGC_BOOL:
return ((struct config_bool *) record)->reset_val ? "on" : "off";
case PGC_INT:
snprintf(buffer, sizeof(buffer), "%d",
((struct config_int *) record)->reset_val);
return buffer;
case PGC_REAL:
snprintf(buffer, sizeof(buffer), "%g",
((struct config_real *) record)->reset_val);
return buffer;
case PGC_STRING:
return ((struct config_string *) record)->reset_val;
case PGC_ENUM:
return config_enum_lookup_by_value((struct config_enum *) record,
((struct config_enum *) record)->reset_val);
}
return NULL;
}
/*
* Detect whether the given configuration option can only be set by
* a superuser.
*/
bool
IsSuperuserConfigOption(const char *name)
{
struct config_generic *record;
record = find_option(name, false, ERROR);
/* On an unrecognized name, don't error, just return false. */
if (record == NULL)
return false;
return (record->context == PGC_SUSET);
}
/*
* GUC_complaint_elevel
* Get the ereport error level to use in an assign_hook's error report.
*
* This should be used by assign hooks that want to emit a custom error
* report (in addition to the generic "invalid value for option FOO" that
* guc.c will provide). Note that the result might be ERROR or a lower
* level, so the caller must be prepared for control to return from ereport,
* or not. If control does return, return false/NULL from the hook function.
*
* At some point it'd be nice to replace this with a mechanism that allows
* the custom message to become the DETAIL line of guc.c's generic message.
*/
int
GUC_complaint_elevel(GucSource source)
{
int elevel;
if (source == PGC_S_FILE)
{
/*
* To avoid cluttering the log, only the postmaster bleats loudly
* about problems with the config file.
*/
elevel = IsUnderPostmaster ? DEBUG3 : LOG;
}
else if (source == PGC_S_OVERRIDE)
{
/*
* If we're a postmaster child, this is probably "undo" during
* transaction abort, so we don't want to clutter the log. There's
* a small chance of a real problem with an OVERRIDE setting,
* though, so suppressing the message entirely wouldn't be desirable.
*/
elevel = IsUnderPostmaster ? DEBUG5 : LOG;
}
else if (source < PGC_S_INTERACTIVE)
elevel = LOG;
else
elevel = ERROR;
return elevel;
}
/*
* flatten_set_variable_args
* Given a parsenode List as emitted by the grammar for SET,
* convert to the flat string representation used by GUC.
*
* We need to be told the name of the variable the args are for, because
* the flattening rules vary (ugh).
*
* The result is NULL if args is NIL (ie, SET ... TO DEFAULT), otherwise
* a palloc'd string.
*/
static char *
flatten_set_variable_args(const char *name, List *args)
{
struct config_generic *record;
int flags;
StringInfoData buf;
ListCell *l;
/* Fast path if just DEFAULT */
if (args == NIL)
return NULL;
/* Else get flags for the variable */
record = find_option(name, true, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
flags = record->flags;
/* Complain if list input and non-list variable */
if ((flags & GUC_LIST_INPUT) == 0 &&
list_length(args) != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("SET %s takes only one argument", name)));
initStringInfo(&buf);
/*
* Each list member may be a plain A_Const node, or an A_Const within a
* TypeCast; the latter case is supported only for ConstInterval
* arguments (for SET TIME ZONE).
*/
foreach(l, args)
{
Node *arg = (Node *) lfirst(l);
char *val;
TypeName *typename = NULL;
A_Const *con;
if (l != list_head(args))
appendStringInfo(&buf, ", ");
if (IsA(arg, TypeCast))
{
TypeCast *tc = (TypeCast *) arg;
arg = tc->arg;
typename = tc->typename;
}
if (!IsA(arg, A_Const))
elog(ERROR, "unrecognized node type: %d", (int) nodeTag(arg));
con = (A_Const *) arg;
switch (nodeTag(&con->val))
{
case T_Integer:
appendStringInfo(&buf, "%ld", intVal(&con->val));
break;
case T_Float:
/* represented as a string, so just copy it */
appendStringInfoString(&buf, strVal(&con->val));
break;
case T_String:
val = strVal(&con->val);
if (typename != NULL)
{
/*
* Must be a ConstInterval argument for TIME ZONE. Coerce
* to interval and back to normalize the value and account
* for any typmod.
*/
Oid typoid;
int32 typmod;
Datum interval;
char *intervalout;
typoid = typenameTypeId(NULL, typename, &typmod);
Assert(typoid == INTERVALOID);
interval =
DirectFunctionCall3(interval_in,
CStringGetDatum(val),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(typmod));
intervalout =
DatumGetCString(DirectFunctionCall1(interval_out,
interval));
appendStringInfo(&buf, "INTERVAL '%s'", intervalout);
}
else
{
/*
* Plain string literal or identifier. For quote mode,
* quote it if it's not a vanilla identifier.
*/
if (flags & GUC_LIST_QUOTE)
appendStringInfoString(&buf, quote_identifier(val));
else
appendStringInfoString(&buf, val);
}
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(&con->val));
break;
}
}
return buf.data;
}
/*
* SET command
*/
void
ExecSetVariableStmt(VariableSetStmt *stmt)
{
GucAction action = stmt->is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET;
switch (stmt->kind)
{
case VAR_SET_VALUE:
case VAR_SET_CURRENT:
set_config_option(stmt->name,
ExtractSetVariableArgs(stmt),
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
action,
true);
break;
case VAR_SET_MULTI:
/*
* Special case for special SQL syntax that effectively sets more
* than one variable per statement.
*/
if (strcmp(stmt->name, "TRANSACTION") == 0)
{
ListCell *head;
foreach(head, stmt->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation") == 0)
SetPGVariable("transaction_isolation",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_read_only") == 0)
SetPGVariable("transaction_read_only",
list_make1(item->arg), stmt->is_local);
else
elog(ERROR, "unexpected SET TRANSACTION element: %s",
item->defname);
}
}
else if (strcmp(stmt->name, "SESSION CHARACTERISTICS") == 0)
{
ListCell *head;
foreach(head, stmt->args)
{
DefElem *item = (DefElem *) lfirst(head);
if (strcmp(item->defname, "transaction_isolation") == 0)
SetPGVariable("default_transaction_isolation",
list_make1(item->arg), stmt->is_local);
else if (strcmp(item->defname, "transaction_read_only") == 0)
SetPGVariable("default_transaction_read_only",
list_make1(item->arg), stmt->is_local);
else
elog(ERROR, "unexpected SET SESSION element: %s",
item->defname);
}
}
else
elog(ERROR, "unexpected SET MULTI element: %s",
stmt->name);
break;
case VAR_SET_DEFAULT:
case VAR_RESET:
set_config_option(stmt->name,
NULL,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
action,
true);
break;
case VAR_RESET_ALL:
ResetAllOptions();
break;
}
}
/*
* Get the value to assign for a VariableSetStmt, or NULL if it's RESET.
* The result is palloc'd.
*
* This is exported for use by actions such as ALTER ROLE SET.
*/
char *
ExtractSetVariableArgs(VariableSetStmt *stmt)
{
switch (stmt->kind)
{
case VAR_SET_VALUE:
return flatten_set_variable_args(stmt->name, stmt->args);
case VAR_SET_CURRENT:
return GetConfigOptionByName(stmt->name, NULL);
default:
return NULL;
}
}
/*
* SetPGVariable - SET command exported as an easily-C-callable function.
*
* This provides access to SET TO value, as well as SET TO DEFAULT (expressed
* by passing args == NIL), but not SET FROM CURRENT functionality.
*/
void
SetPGVariable(const char *name, List *args, bool is_local)
{
char *argstring = flatten_set_variable_args(name, args);
/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
set_config_option(name,
argstring,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
true);
}
/*
* SET command wrapped as a SQL callable function.
*/
Datum
set_config_by_name(PG_FUNCTION_ARGS)
{
char *name;
char *value;
char *new_value;
bool is_local;
if (PG_ARGISNULL(0))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("SET requires parameter name")));
/* Get the GUC variable name */
name = TextDatumGetCString(PG_GETARG_DATUM(0));
/* Get the desired value or set to NULL for a reset request */
if (PG_ARGISNULL(1))
value = NULL;
else
value = TextDatumGetCString(PG_GETARG_DATUM(1));
/*
* Get the desired state of is_local. Default to false if provided value
* is NULL
*/
if (PG_ARGISNULL(2))
is_local = false;
else
is_local = PG_GETARG_BOOL(2);
/* Note SET DEFAULT (argstring == NULL) is equivalent to RESET */
set_config_option(name,
value,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
is_local ? GUC_ACTION_LOCAL : GUC_ACTION_SET,
true);
/* get the new current value */
new_value = GetConfigOptionByName(name, NULL);
/* Convert return string to text */
PG_RETURN_TEXT_P(cstring_to_text(new_value));
}
/*
* Common code for DefineCustomXXXVariable subroutines: allocate the
* new variable's config struct and fill in generic fields.
*/
static struct config_generic *
init_custom_variable(const char *name,
const char *short_desc,
const char *long_desc,
GucContext context,
int flags,
enum config_type type,
size_t sz)
{
struct config_generic *gen;
/*
* Only allow custom PGC_POSTMASTER variables to be created during
* shared library preload; any later than that, we can't ensure that
* the value doesn't change after startup. This is a fatal elog if it
* happens; just erroring out isn't safe because we don't know what
* the calling loadable module might already have hooked into.
*/
if (context == PGC_POSTMASTER &&
!process_shared_preload_libraries_in_progress)
elog(FATAL, "cannot create PGC_POSTMASTER variables after startup");
gen = (struct config_generic *) guc_malloc(ERROR, sz);
memset(gen, 0, sz);
gen->name = guc_strdup(ERROR, name);
gen->context = context;
gen->group = CUSTOM_OPTIONS;
gen->short_desc = short_desc;
gen->long_desc = long_desc;
gen->flags = flags;
gen->vartype = type;
return gen;
}
/*
* Common code for DefineCustomXXXVariable subroutines: insert the new
* variable into the GUC variable array, replacing any placeholder.
*/
static void
define_custom_variable(struct config_generic * variable)
{
const char *name = variable->name;
const char **nameAddr = &name;
const char *value;
struct config_string *pHolder;
GucContext phcontext;
struct config_generic **res;
/*
* See if there's a placeholder by the same name.
*/
res = (struct config_generic **) bsearch((void *) &nameAddr,
(void *) guc_variables,
num_guc_variables,
sizeof(struct config_generic *),
guc_var_compare);
if (res == NULL)
{
/*
* No placeholder to replace, so we can just add it ... but first,
* make sure it's initialized to its default value.
*/
InitializeOneGUCOption(variable);
add_guc_variable(variable, ERROR);
return;
}
/*
* This better be a placeholder
*/
if (((*res)->flags & GUC_CUSTOM_PLACEHOLDER) == 0)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("attempt to redefine parameter \"%s\"", name)));
Assert((*res)->vartype == PGC_STRING);
pHolder = (struct config_string *) (*res);
/*
* First, set the variable to its default value. We must do this even
* though we intend to immediately apply a new value, since it's possible
* that the new value is invalid.
*/
InitializeOneGUCOption(variable);
/*
* Replace the placeholder. We aren't changing the name, so no re-sorting
* is necessary
*/
*res = variable;
/*
* Infer context for assignment based on source of existing value.
* We can't tell this with exact accuracy, but we can at least do
* something reasonable in typical cases.
*/
switch (pHolder->gen.source)
{
case PGC_S_DEFAULT:
case PGC_S_ENV_VAR:
case PGC_S_FILE:
case PGC_S_ARGV:
/*
* If we got past the check in init_custom_variable, we can
* safely assume that any existing value for a PGC_POSTMASTER
* variable was set in postmaster context.
*/
if (variable->context == PGC_POSTMASTER)
phcontext = PGC_POSTMASTER;
else
phcontext = PGC_SIGHUP;
break;
case PGC_S_DATABASE:
case PGC_S_USER:
case PGC_S_CLIENT:
case PGC_S_SESSION:
default:
phcontext = PGC_USERSET;
break;
}
/*
* Assign the string value stored in the placeholder to the real variable.
*
* XXX this is not really good enough --- it should be a nontransactional
* assignment, since we don't want it to roll back if the current xact
* fails later. (Or do we?)
*/
value = *pHolder->variable;
if (value)
set_config_option(name, value,
phcontext, pHolder->gen.source,
GUC_ACTION_SET, true);
/*
* Free up as much as we conveniently can of the placeholder structure
* (this neglects any stack items...)
*/
set_string_field(pHolder, pHolder->variable, NULL);
set_string_field(pHolder, &pHolder->reset_val, NULL);
free(pHolder);
}
void
DefineCustomBoolVariable(const char *name,
const char *short_desc,
const char *long_desc,
bool *valueAddr,
bool bootValue,
GucContext context,
int flags,
GucBoolAssignHook assign_hook,
GucShowHook show_hook)
{
struct config_bool *var;
var = (struct config_bool *)
init_custom_variable(name, short_desc, long_desc, context, flags,
PGC_BOOL, sizeof(struct config_bool));
var->variable = valueAddr;
var->boot_val = bootValue;
var->reset_val = bootValue;
var->assign_hook = assign_hook;
var->show_hook = show_hook;
define_custom_variable(&var->gen);
}
void
DefineCustomIntVariable(const char *name,
const char *short_desc,
const char *long_desc,
int *valueAddr,
int bootValue,
int minValue,
int maxValue,
GucContext context,
int flags,
GucIntAssignHook assign_hook,
GucShowHook show_hook)
{
struct config_int *var;
var = (struct config_int *)
init_custom_variable(name, short_desc, long_desc, context, flags,
PGC_INT, sizeof(struct config_int));
var->variable = valueAddr;
var->boot_val = bootValue;
var->reset_val = bootValue;
var->min = minValue;
var->max = maxValue;
var->assign_hook = assign_hook;
var->show_hook = show_hook;
define_custom_variable(&var->gen);
}
void
DefineCustomRealVariable(const char *name,
const char *short_desc,
const char *long_desc,
double *valueAddr,
double bootValue,
double minValue,
double maxValue,
GucContext context,
int flags,
GucRealAssignHook assign_hook,
GucShowHook show_hook)
{
struct config_real *var;
var = (struct config_real *)
init_custom_variable(name, short_desc, long_desc, context, flags,
PGC_REAL, sizeof(struct config_real));
var->variable = valueAddr;
var->boot_val = bootValue;
var->reset_val = bootValue;
var->min = minValue;
var->max = maxValue;
var->assign_hook = assign_hook;
var->show_hook = show_hook;
define_custom_variable(&var->gen);
}
void
DefineCustomStringVariable(const char *name,
const char *short_desc,
const char *long_desc,
char **valueAddr,
const char *bootValue,
GucContext context,
int flags,
GucStringAssignHook assign_hook,
GucShowHook show_hook)
{
struct config_string *var;
var = (struct config_string *)
init_custom_variable(name, short_desc, long_desc, context, flags,
PGC_STRING, sizeof(struct config_string));
var->variable = valueAddr;
var->boot_val = bootValue;
/* we could probably do without strdup, but keep it like normal case */
if (var->boot_val)
var->reset_val = guc_strdup(ERROR, var->boot_val);
var->assign_hook = assign_hook;
var->show_hook = show_hook;
define_custom_variable(&var->gen);
}
void
DefineCustomEnumVariable(const char *name,
const char *short_desc,
const char *long_desc,
int *valueAddr,
int bootValue,
const struct config_enum_entry *options,
GucContext context,
int flags,
GucEnumAssignHook assign_hook,
GucShowHook show_hook)
{
struct config_enum *var;
var = (struct config_enum *)
init_custom_variable(name, short_desc, long_desc, context, flags,
PGC_ENUM, sizeof(struct config_enum));
var->variable = valueAddr;
var->boot_val = bootValue;
var->reset_val = bootValue;
var->options = options;
var->assign_hook = assign_hook;
var->show_hook = show_hook;
define_custom_variable(&var->gen);
}
void
EmitWarningsOnPlaceholders(const char *className)
{
struct config_generic **vars = guc_variables;
struct config_generic **last = vars + num_guc_variables;
int nameLen = strlen(className);
while (vars < last)
{
struct config_generic *var = *vars++;
if ((var->flags & GUC_CUSTOM_PLACEHOLDER) != 0 &&
strncmp(className, var->name, nameLen) == 0 &&
var->name[nameLen] == GUC_QUALIFIER_SEPARATOR)
{
ereport(INFO,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", var->name)));
}
}
}
/*
* SHOW command
*/
void
GetPGVariable(const char *name, DestReceiver *dest)
{
if (guc_name_compare(name, "all") == 0)
ShowAllGUCConfig(dest);
else
ShowGUCConfigOption(name, dest);
}
TupleDesc
GetPGVariableResultDesc(const char *name)
{
TupleDesc tupdesc;
if (guc_name_compare(name, "all") == 0)
{
/* need a tuple descriptor representing three TEXT columns */
tupdesc = CreateTemplateTupleDesc(3, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
TEXTOID, -1, 0);
}
else
{
const char *varname;
/* Get the canonical spelling of name */
(void) GetConfigOptionByName(name, &varname);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
TEXTOID, -1, 0);
}
return tupdesc;
}
/*
* SHOW command
*/
static void
ShowGUCConfigOption(const char *name, DestReceiver *dest)
{
TupOutputState *tstate;
TupleDesc tupdesc;
const char *varname;
char *value;
/* Get the value and canonical spelling of name */
value = GetConfigOptionByName(name, &varname);
/* need a tuple descriptor representing a single TEXT column */
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, varname,
TEXTOID, -1, 0);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc);
/* Send it */
do_text_output_oneline(tstate, value);
end_tup_output(tstate);
}
/*
* SHOW ALL command
*/
static void
ShowAllGUCConfig(DestReceiver *dest)
{
bool am_superuser = superuser();
int i;
TupOutputState *tstate;
TupleDesc tupdesc;
char *values[3];
/* need a tuple descriptor representing three TEXT columns */
tupdesc = CreateTemplateTupleDesc(3, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "description",
TEXTOID, -1, 0);
/* prepare for projection of tuples */
tstate = begin_tup_output_tupdesc(dest, tupdesc);
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *conf = guc_variables[i];
if ((conf->flags & GUC_NO_SHOW_ALL) ||
((conf->flags & GUC_SUPERUSER_ONLY) && !am_superuser))
continue;
/* assign to the values array */
values[0] = (char *) conf->name;
values[1] = _ShowOption(conf, true);
values[2] = (char *) conf->short_desc;
/* send it to dest */
do_tup_output(tstate, values);
/* clean up */
if (values[1] != NULL)
pfree(values[1]);
}
end_tup_output(tstate);
}
/*
* Return GUC variable value by name; optionally return canonical
* form of name. Return value is palloc'd.
*/
char *
GetConfigOptionByName(const char *name, const char **varname)
{
struct config_generic *record;
record = find_option(name, false, ERROR);
if (record == NULL)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
if ((record->flags & GUC_SUPERUSER_ONLY) && !superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to examine \"%s\"", name)));
if (varname)
*varname = record->name;
return _ShowOption(record, true);
}
/*
* Return GUC variable value by variable number; optionally return canonical
* form of name. Return value is palloc'd.
*/
void
GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
{
char buffer[256];
struct config_generic *conf;
/* check requested variable number valid */
Assert((varnum >= 0) && (varnum < num_guc_variables));
conf = guc_variables[varnum];
if (noshow)
{
if ((conf->flags & GUC_NO_SHOW_ALL) ||
((conf->flags & GUC_SUPERUSER_ONLY) && !superuser()))
*noshow = true;
else
*noshow = false;
}
/* first get the generic attributes */
/* name */
values[0] = conf->name;
/* setting : use _ShowOption in order to avoid duplicating the logic */
values[1] = _ShowOption(conf, false);
/* unit */
if (conf->vartype == PGC_INT)
{
static char buf[8];
switch (conf->flags & (GUC_UNIT_MEMORY | GUC_UNIT_TIME))
{
case GUC_UNIT_KB:
values[2] = "kB";
break;
case GUC_UNIT_BLOCKS:
snprintf(buf, sizeof(buf), "%dkB", BLCKSZ / 1024);
values[2] = buf;
break;
case GUC_UNIT_XBLOCKS:
snprintf(buf, sizeof(buf), "%dkB", XLOG_BLCKSZ / 1024);
values[2] = buf;
break;
case GUC_UNIT_MS:
values[2] = "ms";
break;
case GUC_UNIT_S:
values[2] = "s";
break;
case GUC_UNIT_MIN:
values[2] = "min";
break;
default:
values[2] = "";
break;
}
}
else
values[2] = NULL;
/* group */
values[3] = config_group_names[conf->group];
/* short_desc */
values[4] = conf->short_desc;
/* extra_desc */
values[5] = conf->long_desc;
/* context */
values[6] = GucContext_Names[conf->context];
/* vartype */
values[7] = config_type_names[conf->vartype];
/* source */
values[8] = GucSource_Names[conf->source];
/* now get the type specifc attributes */
switch (conf->vartype)
{
case PGC_BOOL:
{
struct config_bool *lconf = (struct config_bool *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
values[12] = pstrdup(lconf->boot_val ? "on" : "off");
/* reset_val */
values[13] = pstrdup(lconf->reset_val ? "on" : "off");
}
break;
case PGC_INT:
{
struct config_int *lconf = (struct config_int *) conf;
/* min_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->min);
values[9] = pstrdup(buffer);
/* max_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->max);
values[10] = pstrdup(buffer);
/* enumvals */
values[11] = NULL;
/* boot_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->boot_val);
values[12] = pstrdup(buffer);
/* reset_val */
snprintf(buffer, sizeof(buffer), "%d", lconf->reset_val);
values[13] = pstrdup(buffer);
}
break;
case PGC_REAL:
{
struct config_real *lconf = (struct config_real *) conf;
/* min_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->min);
values[9] = pstrdup(buffer);
/* max_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->max);
values[10] = pstrdup(buffer);
/* enumvals */
values[11] = NULL;
/* boot_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->boot_val);
values[12] = pstrdup(buffer);
/* reset_val */
snprintf(buffer, sizeof(buffer), "%g", lconf->reset_val);
values[13] = pstrdup(buffer);
}
break;
case PGC_STRING:
{
struct config_string *lconf = (struct config_string *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
if (lconf->boot_val == NULL)
values[12] = NULL;
else
values[12] = pstrdup(lconf->boot_val);
/* reset_val */
if (lconf->reset_val == NULL)
values[13] = NULL;
else
values[13] = pstrdup(lconf->reset_val);
}
break;
case PGC_ENUM:
{
struct config_enum *lconf = (struct config_enum *) conf;
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
/* NOTE! enumvals with double quotes in them are not supported! */
values[11] = config_enum_get_options((struct config_enum *) conf,
"{\"", "\"}", "\",\"");
/* boot_val */
values[12] = pstrdup(config_enum_lookup_by_value(lconf,
lconf->boot_val));
/* reset_val */
values[13] = pstrdup(config_enum_lookup_by_value(lconf,
lconf->reset_val));
}
break;
default:
{
/*
* should never get here, but in case we do, set 'em to NULL
*/
/* min_val */
values[9] = NULL;
/* max_val */
values[10] = NULL;
/* enumvals */
values[11] = NULL;
/* boot_val */
values[12] = NULL;
/* reset_val */
values[13] = NULL;
}
break;
}
/*
* If the setting came from a config file, set the source location.
* For security reasons, we don't show source file/line number for
* non-superusers.
*/
if (conf->source == PGC_S_FILE && superuser())
{
values[14] = conf->sourcefile;
snprintf(buffer, sizeof(buffer), "%d", conf->sourceline);
values[15] = pstrdup(buffer);
}
else
{
values[14] = NULL;
values[15] = NULL;
}
}
/*
* Return the total number of GUC variables
*/
int
GetNumConfigOptions(void)
{
return num_guc_variables;
}
/*
* show_config_by_name - equiv to SHOW X command but implemented as
* a function.
*/
Datum
show_config_by_name(PG_FUNCTION_ARGS)
{
char *varname;
char *varval;
/* Get the GUC variable name */
varname = TextDatumGetCString(PG_GETARG_DATUM(0));
/* Get the value */
varval = GetConfigOptionByName(varname, NULL);
/* Convert to text */
PG_RETURN_TEXT_P(cstring_to_text(varval));
}
/*
* show_all_settings - equiv to SHOW ALL command but implemented as
* a Table Function.
*/
#define NUM_PG_SETTINGS_ATTS 16
Datum
show_all_settings(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
TupleDesc tupdesc;
int call_cntr;
int max_calls;
AttInMetadata *attinmeta;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/*
* need a tuple descriptor representing NUM_PG_SETTINGS_ATTS columns
* of the appropriate types
*/
tupdesc = CreateTemplateTupleDesc(NUM_PG_SETTINGS_ATTS, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "setting",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "unit",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "category",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "short_desc",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "extra_desc",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "context",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "vartype",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "source",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "min_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "max_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 12, "enumvals",
TEXTARRAYOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 13, "boot_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 14, "reset_val",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 15, "sourcefile",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 16, "sourceline",
INT4OID, -1, 0);
/*
* Generate attribute metadata needed later to produce tuples from raw
* C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
/* total number of tuples to be returned */
funcctx->max_calls = GetNumConfigOptions();
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
attinmeta = funcctx->attinmeta;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char *values[NUM_PG_SETTINGS_ATTS];
bool noshow;
HeapTuple tuple;
Datum result;
/*
* Get the next visible GUC variable name and value
*/
do
{
GetConfigOptionByNum(call_cntr, (const char **) values, &noshow);
if (noshow)
{
/* bump the counter and get the next config setting */
call_cntr = ++funcctx->call_cntr;
/* make sure we haven't gone too far now */
if (call_cntr >= max_calls)
SRF_RETURN_DONE(funcctx);
}
} while (noshow);
/* build a tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
}
static char *
_ShowOption(struct config_generic * record, bool use_units)
{
char buffer[256];
const char *val;
switch (record->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
val = *conf->variable ? "on" : "off";
}
break;
case PGC_INT:
{
struct config_int *conf = (struct config_int *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
{
/*
* Use int64 arithmetic to avoid overflows in units
* conversion. If INT64_IS_BUSTED we might overflow
* anyway and print bogus answers, but there are few
* enough such machines that it doesn't seem worth
* trying harder.
*/
int64 result = *conf->variable;
const char *unit;
if (use_units && result > 0 &&
(record->flags & GUC_UNIT_MEMORY))
{
switch (record->flags & GUC_UNIT_MEMORY)
{
case GUC_UNIT_BLOCKS:
result *= BLCKSZ / 1024;
break;
case GUC_UNIT_XBLOCKS:
result *= XLOG_BLCKSZ / 1024;
break;
}
if (result % KB_PER_GB == 0)
{
result /= KB_PER_GB;
unit = "GB";
}
else if (result % KB_PER_MB == 0)
{
result /= KB_PER_MB;
unit = "MB";
}
else
{
unit = "kB";
}
}
else if (use_units && result > 0 &&
(record->flags & GUC_UNIT_TIME))
{
switch (record->flags & GUC_UNIT_TIME)
{
case GUC_UNIT_S:
result *= MS_PER_S;
break;
case GUC_UNIT_MIN:
result *= MS_PER_MIN;
break;
}
if (result % MS_PER_D == 0)
{
result /= MS_PER_D;
unit = "d";
}
else if (result % MS_PER_H == 0)
{
result /= MS_PER_H;
unit = "h";
}
else if (result % MS_PER_MIN == 0)
{
result /= MS_PER_MIN;
unit = "min";
}
else if (result % MS_PER_S == 0)
{
result /= MS_PER_S;
unit = "s";
}
else
{
unit = "ms";
}
}
else
unit = "";
snprintf(buffer, sizeof(buffer), INT64_FORMAT "%s",
result, unit);
val = buffer;
}
}
break;
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else
{
snprintf(buffer, sizeof(buffer), "%g",
*conf->variable);
val = buffer;
}
}
break;
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) record;
if (conf->show_hook)
val = (*conf->show_hook) ();
else if (*conf->variable && **conf->variable)
val = *conf->variable;
else
val = "";
}
break;
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) record;
if(conf->show_hook)
val = (*conf->show_hook) ();
else
val = config_enum_lookup_by_value(conf, *conf->variable);
}
break;
default:
/* just to keep compiler quiet */
val = "???";
break;
}
return pstrdup(val);
}
/*
* Attempt (badly) to detect if a proposed new GUC setting is the same
* as the current value.
*
* XXX this does not really work because it doesn't account for the
* effects of canonicalization of string values by assign_hooks.
*/
static bool
is_newvalue_equal(struct config_generic * record, const char *newvalue)
{
/* newvalue == NULL isn't supported */
Assert(newvalue != NULL);
switch (record->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) record;
bool newval;
return parse_bool(newvalue, &newval)
&& *conf->variable == newval;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) record;
int newval;
return parse_int(newvalue, &newval, record->flags, NULL)
&& *conf->variable == newval;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) record;
double newval;
return parse_real(newvalue, &newval)
&& *conf->variable == newval;
}
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) record;
return *conf->variable != NULL &&
strcmp(*conf->variable, newvalue) == 0;
}
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) record;
int newval;
return config_enum_lookup_by_name(conf, newvalue, &newval) &&
*conf->variable == newval;
}
}
return false;
}
#ifdef EXEC_BACKEND
/*
* These routines dump out all non-default GUC options into a binary
* file that is read by all exec'ed backends. The format is:
*
* variable name, string, null terminated
* variable value, string, null terminated
* variable source, integer
*/
static void
write_one_nondefault_variable(FILE *fp, struct config_generic *gconf)
{
if (gconf->source == PGC_S_DEFAULT)
return;
fprintf(fp, "%s", gconf->name);
fputc(0, fp);
switch (gconf->vartype)
{
case PGC_BOOL:
{
struct config_bool *conf = (struct config_bool *) gconf;
if (*conf->variable)
fprintf(fp, "true");
else
fprintf(fp, "false");
}
break;
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
fprintf(fp, "%d", *conf->variable);
}
break;
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
/* Could lose precision here? */
fprintf(fp, "%f", *conf->variable);
}
break;
case PGC_STRING:
{
struct config_string *conf = (struct config_string *) gconf;
fprintf(fp, "%s", *conf->variable);
}
break;
case PGC_ENUM:
{
struct config_enum *conf = (struct config_enum *) gconf;
fprintf(fp, "%s",
config_enum_lookup_by_value(conf, *conf->variable));
}
break;
}
fputc(0, fp);
fwrite(&gconf->source, sizeof(gconf->source), 1, fp);
}
void
write_nondefault_variables(GucContext context)
{
int elevel;
FILE *fp;
struct config_generic *cvc_conf;
int i;
Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);
elevel = (context == PGC_SIGHUP) ? LOG : ERROR;
/*
* Open file
*/
fp = AllocateFile(CONFIG_EXEC_PARAMS_NEW, "w");
if (!fp)
{
ereport(elevel,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
CONFIG_EXEC_PARAMS_NEW)));
return;
}
/*
* custom_variable_classes must be written out first; otherwise we might
* reject custom variable values while reading the file.
*/
cvc_conf = find_option("custom_variable_classes", false, ERROR);
if (cvc_conf)
write_one_nondefault_variable(fp, cvc_conf);
for (i = 0; i < num_guc_variables; i++)
{
struct config_generic *gconf = guc_variables[i];
if (gconf != cvc_conf)
write_one_nondefault_variable(fp, gconf);
}
if (FreeFile(fp))
{
ereport(elevel,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
CONFIG_EXEC_PARAMS_NEW)));
return;
}
/*
* Put new file in place. This could delay on Win32, but we don't hold
* any exclusive locks.
*/
rename(CONFIG_EXEC_PARAMS_NEW, CONFIG_EXEC_PARAMS);
}
/*
* Read string, including null byte from file
*
* Return NULL on EOF and nothing read
*/
static char *
read_string_with_null(FILE *fp)
{
int i = 0,
ch,
maxlen = 256;
char *str = NULL;
do
{
if ((ch = fgetc(fp)) == EOF)
{
if (i == 0)
return NULL;
else
elog(FATAL, "invalid format of exec config params file");
}
if (i == 0)
str = guc_malloc(FATAL, maxlen);
else if (i == maxlen)
str = guc_realloc(FATAL, str, maxlen *= 2);
str[i++] = ch;
} while (ch != 0);
return str;
}
/*
* This routine loads a previous postmaster dump of its non-default
* settings.
*/
void
read_nondefault_variables(void)
{
FILE *fp;
char *varname,
*varvalue;
int varsource;
/*
* Open file
*/
fp = AllocateFile(CONFIG_EXEC_PARAMS, "r");
if (!fp)
{
/* File not found is fine */
if (errno != ENOENT)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not read from file \"%s\": %m",
CONFIG_EXEC_PARAMS)));
return;
}
for (;;)
{
struct config_generic *record;
if ((varname = read_string_with_null(fp)) == NULL)
break;
if ((record = find_option(varname, true, FATAL)) == NULL)
elog(FATAL, "failed to locate variable %s in exec config params file", varname);
if ((varvalue = read_string_with_null(fp)) == NULL)
elog(FATAL, "invalid format of exec config params file");
if (fread(&varsource, sizeof(varsource), 1, fp) == 0)
elog(FATAL, "invalid format of exec config params file");
(void) set_config_option(varname, varvalue, record->context,
varsource, GUC_ACTION_SET, true);
free(varname);
free(varvalue);
}
FreeFile(fp);
}
#endif /* EXEC_BACKEND */
/*
* A little "long argument" simulation, although not quite GNU
* compliant. Takes a string of the form "some-option=some value" and
* returns name = "some_option" and value = "some value" in malloc'ed
* storage. Note that '-' is converted to '_' in the option name. If
* there is no '=' in the input string then value will be NULL.
*/
void
ParseLongOption(const char *string, char **name, char **value)
{
size_t equal_pos;
char *cp;
AssertArg(string);
AssertArg(name);
AssertArg(value);
equal_pos = strcspn(string, "=");
if (string[equal_pos] == '=')
{
*name = guc_malloc(FATAL, equal_pos + 1);
strlcpy(*name, string, equal_pos + 1);
*value = guc_strdup(FATAL, &string[equal_pos + 1]);
}
else
{
/* no equal sign in string */
*name = guc_strdup(FATAL, string);
*value = NULL;
}
for (cp = *name; *cp; cp++)
if (*cp == '-')
*cp = '_';
}
/*
* Handle options fetched from pg_database.datconfig, pg_authid.rolconfig,
* pg_proc.proconfig, etc. Caller must specify proper context/source/action.
*
* The array parameter must be an array of TEXT (it must not be NULL).
*/
void
ProcessGUCArray(ArrayType *array,
GucContext context, GucSource source, GucAction action)
{
int i;
Assert(array != NULL);
Assert(ARR_ELEMTYPE(array) == TEXTOID);
Assert(ARR_NDIM(array) == 1);
Assert(ARR_LBOUND(array)[0] == 1);
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
bool isnull;
char *s;
char *name;
char *value;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
s = TextDatumGetCString(d);
ParseLongOption(s, &name, &value);
if (!value)
{
ereport(WARNING,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("could not parse setting for parameter \"%s\"",
name)));
free(name);
continue;
}
(void) set_config_option(name, value, context, source, action, true);
free(name);
if (value)
free(value);
}
}
/*
* Add an entry to an option array. The array parameter may be NULL
* to indicate the current table entry is NULL.
*/
ArrayType *
GUCArrayAdd(ArrayType *array, const char *name, const char *value)
{
const char *varname;
Datum datum;
char *newval;
ArrayType *a;
Assert(name);
Assert(value);
/* test if the option is valid */
set_config_option(name, value,
superuser() ? PGC_SUSET : PGC_USERSET,
PGC_S_TEST, GUC_ACTION_SET, false);
/* convert name to canonical spelling, so we can use plain strcmp */
(void) GetConfigOptionByName(name, &varname);
name = varname;
newval = palloc(strlen(name) + 1 + strlen(value) + 1);
sprintf(newval, "%s=%s", name, value);
datum = CStringGetTextDatum(newval);
if (array)
{
int index;
bool isnull;
int i;
Assert(ARR_ELEMTYPE(array) == TEXTOID);
Assert(ARR_NDIM(array) == 1);
Assert(ARR_LBOUND(array)[0] == 1);
index = ARR_DIMS(array)[0] + 1; /* add after end */
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
char *current;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
current = TextDatumGetCString(d);
if (strncmp(current, newval, strlen(name) + 1) == 0)
{
index = i;
break;
}
}
a = array_set(array, 1, &index,
datum,
false,
-1 /* varlena array */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ );
}
else
a = construct_array(&datum, 1,
TEXTOID,
-1, false, 'i');
return a;
}
/*
* Delete an entry from an option array. The array parameter may be NULL
* to indicate the current table entry is NULL. Also, if the return value
* is NULL then a null should be stored.
*/
ArrayType *
GUCArrayDelete(ArrayType *array, const char *name)
{
const char *varname;
ArrayType *newarray;
int i;
int index;
Assert(name);
/* test if the option is valid */
set_config_option(name, NULL,
superuser() ? PGC_SUSET : PGC_USERSET,
PGC_S_TEST, GUC_ACTION_SET, false);
/* convert name to canonical spelling, so we can use plain strcmp */
(void) GetConfigOptionByName(name, &varname);
name = varname;
/* if array is currently null, then surely nothing to delete */
if (!array)
return NULL;
newarray = NULL;
index = 1;
for (i = 1; i <= ARR_DIMS(array)[0]; i++)
{
Datum d;
char *val;
bool isnull;
d = array_ref(array, 1, &i,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ ,
&isnull);
if (isnull)
continue;
val = TextDatumGetCString(d);
/* ignore entry if it's what we want to delete */
if (strncmp(val, name, strlen(name)) == 0
&& val[strlen(name)] == '=')
continue;
/* else add it to the output array */
if (newarray)
{
newarray = array_set(newarray, 1, &index,
d,
false,
-1 /* varlenarray */ ,
-1 /* TEXT's typlen */ ,
false /* TEXT's typbyval */ ,
'i' /* TEXT's typalign */ );
}
else
newarray = construct_array(&d, 1,
TEXTOID,
-1, false, 'i');
index++;
}
return newarray;
}
/*
* assign_hook and show_hook subroutines
*/
static const char *
assign_log_destination(const char *value, bool doit, GucSource source)
{
char *rawstring;
List *elemlist;
ListCell *l;
int newlogdest = 0;
/* Need a modifiable copy of string */
rawstring = pstrdup(value);
/* Parse string into list of identifiers */
if (!SplitIdentifierString(rawstring, ',', &elemlist))
{
/* syntax error in list */
pfree(rawstring);
list_free(elemlist);
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid list syntax for parameter \"log_destination\"")));
return NULL;
}
foreach(l, elemlist)
{
char *tok = (char *) lfirst(l);
if (pg_strcasecmp(tok, "stderr") == 0)
newlogdest |= LOG_DESTINATION_STDERR;
else if (pg_strcasecmp(tok, "csvlog") == 0)
newlogdest |= LOG_DESTINATION_CSVLOG;
#ifdef HAVE_SYSLOG
else if (pg_strcasecmp(tok, "syslog") == 0)
newlogdest |= LOG_DESTINATION_SYSLOG;
#endif
#ifdef WIN32
else if (pg_strcasecmp(tok, "eventlog") == 0)
newlogdest |= LOG_DESTINATION_EVENTLOG;
#endif
else
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized \"log_destination\" key word: \"%s\"",
tok)));
pfree(rawstring);
list_free(elemlist);
return NULL;
}
}
if (doit)
Log_destination = newlogdest;
pfree(rawstring);
list_free(elemlist);
return value;
}
#ifdef HAVE_SYSLOG
static bool
assign_syslog_facility(int newval, bool doit, GucSource source)
{
if (doit)
set_syslog_parameters(syslog_ident_str ? syslog_ident_str : "postgres",
newval);
return true;
}
static const char *
assign_syslog_ident(const char *ident, bool doit, GucSource source)
{
if (doit)
set_syslog_parameters(ident, syslog_facility);
return ident;
}
#endif /* HAVE_SYSLOG */
static bool
assign_session_replication_role(int newval, bool doit, GucSource source)
{
/*
* Must flush the plan cache when changing replication role; but don't
* flush unnecessarily.
*/
if (doit && SessionReplicationRole != newval)
{
ResetPlanCache();
}
return true;
}
static const char *
show_num_temp_buffers(void)
{
/*
* We show the GUC var until local buffers have been initialized, and
* NLocBuffer afterwards.
*/
static char nbuf[32];
sprintf(nbuf, "%d", NLocBuffer ? NLocBuffer : num_temp_buffers);
return nbuf;
}
static bool
assign_phony_autocommit(bool newval, bool doit, GucSource source)
{
if (!newval)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("SET AUTOCOMMIT TO OFF is no longer supported")));
return false;
}
return true;
}
static const char *
assign_custom_variable_classes(const char *newval, bool doit, GucSource source)
{
/*
* Check syntax. newval must be a comma separated list of identifiers.
* Whitespace is allowed but removed from the result.
*/
bool hasSpaceAfterToken = false;
const char *cp = newval;
int symLen = 0;
char c;
StringInfoData buf;
initStringInfo(&buf);
while ((c = *cp++) != '\0')
{
if (isspace((unsigned char) c))
{
if (symLen > 0)
hasSpaceAfterToken = true;
continue;
}
if (c == ',')
{
if (symLen > 0) /* terminate identifier */
{
appendStringInfoChar(&buf, ',');
symLen = 0;
}
hasSpaceAfterToken = false;
continue;
}
if (hasSpaceAfterToken || !(isalnum((unsigned char) c) || c == '_'))
{
/*
* Syntax error due to token following space after token or
* non-identifier character
*/
pfree(buf.data);
return NULL;
}
appendStringInfoChar(&buf, c);
symLen++;
}
/* Remove stray ',' at end */
if (symLen == 0 && buf.len > 0)
buf.data[--buf.len] = '\0';
/* GUC wants the result malloc'd */
newval = guc_strdup(LOG, buf.data);
pfree(buf.data);
return newval;
}
static bool
assign_debug_assertions(bool newval, bool doit, GucSource source)
{
#ifndef USE_ASSERT_CHECKING
if (newval)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("assertion checking is not supported by this build")));
return false;
}
#endif
return true;
}
static bool
assign_ssl(bool newval, bool doit, GucSource source)
{
#ifndef USE_SSL
if (newval)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("SSL is not supported by this build")));
return false;
}
#endif
return true;
}
static bool
assign_stage_log_stats(bool newval, bool doit, GucSource source)
{
if (newval && log_statement_stats)
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot enable parameter when \"log_statement_stats\" is true")));
/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
if (source != PGC_S_OVERRIDE)
return false;
}
return true;
}
static bool
assign_log_stats(bool newval, bool doit, GucSource source)
{
if (newval &&
(log_parser_stats || log_planner_stats || log_executor_stats))
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot enable \"log_statement_stats\" when "
"\"log_parser_stats\", \"log_planner_stats\", "
"or \"log_executor_stats\" is true")));
/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
if (source != PGC_S_OVERRIDE)
return false;
}
return true;
}
static bool
assign_transaction_read_only(bool newval, bool doit, GucSource source)
{
/* Can't go to r/w mode inside a r/o transaction */
if (newval == false && XactReadOnly && IsSubTransaction())
{
ereport(GUC_complaint_elevel(source),
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("cannot set transaction read-write mode inside a read-only transaction")));
/* source == PGC_S_OVERRIDE means do it anyway, eg at xact abort */
if (source != PGC_S_OVERRIDE)
return false;
}
return true;
}
static const char *
assign_canonical_path(const char *newval, bool doit, GucSource source)
{
if (doit)
{
char *canon_val = guc_strdup(ERROR, newval);
canonicalize_path(canon_val);
return canon_val;
}
else
return newval;
}
static const char *
assign_timezone_abbreviations(const char *newval, bool doit, GucSource source)
{
/*
* The powerup value shown above for timezone_abbreviations is "UNKNOWN".
* When we see this we just do nothing. If this value isn't overridden
* from the config file then pg_timezone_abbrev_initialize() will
* eventually replace it with "Default". This hack has two purposes: to
* avoid wasting cycles loading values that might soon be overridden from
* the config file, and to avoid trying to read the timezone abbrev files
* during InitializeGUCOptions(). The latter doesn't work in an
* EXEC_BACKEND subprocess because my_exec_path hasn't been set yet and so
* we can't locate PGSHAREDIR. (Essentially the same hack is used to
* delay initializing TimeZone ... if we have any more, we should try to
* clean up and centralize this mechanism ...)
*/
if (strcmp(newval, "UNKNOWN") == 0)
{
return newval;
}
/* Loading abbrev file is expensive, so only do it when value changes */
if (timezone_abbreviations_string == NULL ||
strcmp(timezone_abbreviations_string, newval) != 0)
{
int elevel;
/*
* If reading config file, only the postmaster should bleat loudly
* about problems. Otherwise, it's just this one process doing it,
* and we use WARNING message level.
*/
if (source == PGC_S_FILE)
elevel = IsUnderPostmaster ? DEBUG3 : LOG;
else
elevel = WARNING;
if (!load_tzoffsets(newval, doit, elevel))
return NULL;
}
return newval;
}
/*
* pg_timezone_abbrev_initialize --- set default value if not done already
*
* This is called after initial loading of postgresql.conf. If no
* timezone_abbreviations setting was found therein, select default.
*/
void
pg_timezone_abbrev_initialize(void)
{
if (strcmp(timezone_abbreviations_string, "UNKNOWN") == 0)
{
SetConfigOption("timezone_abbreviations", "Default",
PGC_POSTMASTER, PGC_S_ARGV);
}
}
static const char *
show_archive_command(void)
{
if (XLogArchiveMode)
return XLogArchiveCommand;
else
return "(disabled)";
}
static bool
assign_tcp_keepalives_idle(int newval, bool doit, GucSource source)
{
if (doit)
return (pq_setkeepalivesidle(newval, MyProcPort) == STATUS_OK);
return true;
}
static const char *
show_tcp_keepalives_idle(void)
{
static char nbuf[16];
snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesidle(MyProcPort));
return nbuf;
}
static bool
assign_tcp_keepalives_interval(int newval, bool doit, GucSource source)
{
if (doit)
return (pq_setkeepalivesinterval(newval, MyProcPort) == STATUS_OK);
return true;
}
static const char *
show_tcp_keepalives_interval(void)
{
static char nbuf[16];
snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivesinterval(MyProcPort));
return nbuf;
}
static bool
assign_tcp_keepalives_count(int newval, bool doit, GucSource source)
{
if (doit)
return (pq_setkeepalivescount(newval, MyProcPort) == STATUS_OK);
return true;
}
static const char *
show_tcp_keepalives_count(void)
{
static char nbuf[16];
snprintf(nbuf, sizeof(nbuf), "%d", pq_getkeepalivescount(MyProcPort));
return nbuf;
}
static bool
assign_maxconnections(int newval, bool doit, GucSource source)
{
if (newval + autovacuum_max_workers > INT_MAX / 4)
return false;
if (doit)
MaxBackends = newval + autovacuum_max_workers;
return true;
}
static bool
assign_autovacuum_max_workers(int newval, bool doit, GucSource source)
{
if (newval + MaxConnections > INT_MAX / 4)
return false;
if (doit)
MaxBackends = newval + MaxConnections;
return true;
}
static const char *
assign_pgstat_temp_directory(const char *newval, bool doit, GucSource source)
{
if (doit)
{
if (pgstat_stat_tmpname)
free(pgstat_stat_tmpname);
if (pgstat_stat_filename)
free(pgstat_stat_filename);
pgstat_stat_tmpname = guc_malloc(FATAL, strlen(newval) + 12); /* /pgstat.tmp */
pgstat_stat_filename = guc_malloc(FATAL, strlen(newval) + 13); /* /pgstat.stat */
sprintf(pgstat_stat_tmpname, "%s/pgstat.tmp", newval);
sprintf(pgstat_stat_filename, "%s/pgstat.stat", newval);
}
return newval;
}
#include "guc-file.c"
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