f0811a74b3
GUC support. It's now possible to set datestyle, timezone, and client_encoding from postgresql.conf and per-database or per-user settings. Also, implement rollback of SET commands that occur in a transaction that later fails. Create a SET LOCAL var = value syntax that sets the variable only for the duration of the current transaction. All per previous discussions in pghackers.
306 lines
10 KiB
C
306 lines
10 KiB
C
/*-------------------------------------------------------------------------
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*
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* miscadmin.h
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* this file contains general postgres administration and initialization
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* stuff that used to be spread out between the following files:
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* globals.h global variables
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* pdir.h directory path crud
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* pinit.h postgres initialization
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* pmod.h processing modes
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*
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*
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: miscadmin.h,v 1.104 2002/05/17 01:19:19 tgl Exp $
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*
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* NOTES
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* some of the information in this file should be moved to
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* other files.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef MISCADMIN_H
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#define MISCADMIN_H
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#include <sys/types.h>
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/*****************************************************************************
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* System interrupt and critical section handling
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*
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* There are two types of interrupts that a running backend needs to accept
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* without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
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* In both cases, we need to be able to clean up the current transaction
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* gracefully, so we can't respond to the interrupt instantaneously ---
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* there's no guarantee that internal data structures would be self-consistent
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* if the code is interrupted at an arbitrary instant. Instead, the signal
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* handlers set flags that are checked periodically during execution.
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*
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* The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
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* where it is normally safe to accept a cancel or die interrupt. In some
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* cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
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* might sometimes be called in contexts that do *not* want to allow a cancel
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* or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
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* allow code to ensure that no cancel or die interrupt will be accepted,
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* even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
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* will be held off until CHECK_FOR_INTERRUPTS() is done outside any
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* HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
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*
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* Special mechanisms are used to let an interrupt be accepted when we are
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* waiting for a lock or when we are waiting for command input (but, of
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* course, only if the interrupt holdoff counter is zero). See the
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* related code for details.
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*
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* A related, but conceptually distinct, mechanism is the "critical section"
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* mechanism. A critical section not only holds off cancel/die interrupts,
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* but causes any elog(ERROR) or elog(FATAL) to become elog(STOP) --- that is,
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* a system-wide reset is forced. Needless to say, only really *critical*
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* code should be marked as a critical section! Currently, this mechanism
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* is only used for XLOG-related code.
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*
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*****************************************************************************/
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/* in globals.c */
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/* these are marked volatile because they are set by signal handlers: */
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extern volatile bool InterruptPending;
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extern volatile bool QueryCancelPending;
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extern volatile bool ProcDiePending;
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/* these are marked volatile because they are examined by signal handlers: */
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extern volatile bool ImmediateInterruptOK;
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extern volatile uint32 InterruptHoldoffCount;
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extern volatile uint32 CritSectionCount;
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/* in postgres.c */
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extern void ProcessInterrupts(void);
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#define CHECK_FOR_INTERRUPTS() \
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do { \
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if (InterruptPending) \
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ProcessInterrupts(); \
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} while(0)
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#define HOLD_INTERRUPTS() (InterruptHoldoffCount++)
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#define RESUME_INTERRUPTS() \
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do { \
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Assert(InterruptHoldoffCount > 0); \
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InterruptHoldoffCount--; \
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} while(0)
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#define START_CRIT_SECTION() (CritSectionCount++)
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#define END_CRIT_SECTION() \
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do { \
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Assert(CritSectionCount > 0); \
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CritSectionCount--; \
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} while(0)
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/*****************************************************************************
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* globals.h -- *
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*****************************************************************************/
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/*
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* from postmaster/postmaster.c
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*/
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extern bool IsUnderPostmaster;
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extern bool ClientAuthInProgress;
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extern int PostmasterMain(int argc, char *argv[]);
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extern void ClosePostmasterPorts(bool pgstat_too);
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/*
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* from utils/init/globals.c
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*/
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extern bool Noversion;
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extern char *DataDir;
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extern DLLIMPORT int MyProcPid;
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extern struct Port *MyProcPort;
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extern long MyCancelKey;
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extern char OutputFileName[];
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extern char pg_pathname[];
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/*
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* done in storage/backendid.h for now.
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*
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* extern BackendId MyBackendId;
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*/
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extern DLLIMPORT Oid MyDatabaseId;
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/* Date/Time Configuration
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*
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* Constants to pass info from runtime environment:
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* USE_POSTGRES_DATES specifies traditional postgres format for output.
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* USE_ISO_DATES specifies ISO-compliant format for output.
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* USE_SQL_DATES specified Oracle/Ingres-compliant format for output.
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* USE_GERMAN_DATES specifies German-style dd.mm/yyyy date format.
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*
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* DateStyle specifies preference for date formatting for output.
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* EuroDates if client prefers dates interpreted and written w/European conventions.
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*
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* HasCTZSet if client timezone is specified by client.
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* CDayLight is the apparent daylight savings time status.
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* CTimeZone is the timezone offset in seconds.
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* CTZName is the timezone label.
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*/
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#define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
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#define USE_POSTGRES_DATES 0
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#define USE_ISO_DATES 1
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#define USE_SQL_DATES 2
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#define USE_GERMAN_DATES 3
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extern int DateStyle;
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extern bool EuroDates;
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extern bool HasCTZSet;
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extern bool CDayLight;
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extern int CTimeZone;
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extern char CTZName[];
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extern char FloatFormat[];
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extern char DateFormat[];
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extern bool enableFsync;
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extern bool allowSystemTableMods;
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extern int SortMem;
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extern int VacuumMem;
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/*
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* A few postmaster startup options are exported here so the
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* configuration file processor can access them.
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*/
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extern bool NetServer;
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extern bool EnableSSL;
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extern bool SilentMode;
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extern int MaxBackends;
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extern int NBuffers;
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extern int PostPortNumber;
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extern int Unix_socket_permissions;
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extern char *Unix_socket_group;
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extern char *UnixSocketDir;
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extern char *VirtualHost;
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/*****************************************************************************
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* pdir.h -- *
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* POSTGRES directory path definitions. *
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*****************************************************************************/
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extern char *DatabaseName;
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extern char *DatabasePath;
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/* in utils/misc/database.c */
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extern void GetRawDatabaseInfo(const char *name, Oid *db_id, char *path);
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extern char *ExpandDatabasePath(const char *path);
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/* now in utils/init/miscinit.c */
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extern void SetDatabaseName(const char *name);
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extern void SetDatabasePath(const char *path);
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extern char *GetUserName(Oid userid);
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extern Oid GetUserId(void);
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extern void SetUserId(Oid userid);
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extern Oid GetSessionUserId(void);
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extern void SetSessionUserId(Oid userid);
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extern void InitializeSessionUserId(const char *username);
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extern void InitializeSessionUserIdStandalone(void);
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extern void SetSessionAuthorization(Oid userid);
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extern void SetDataDir(const char *dir);
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extern int FindExec(char *full_path, const char *argv0,
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const char *binary_name);
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extern int CheckPathAccess(char *path, char *name, int open_mode);
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#ifdef CYR_RECODE
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extern void SetCharSet(void);
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extern char *convertstr(unsigned char *buff, int len, int dest);
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#endif
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/* in utils/misc/superuser.c */
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extern bool superuser(void); /* current user is superuser */
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extern bool superuser_arg(Oid userid); /* given user is superuser */
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extern bool is_dbadmin(Oid dbid); /* current user is owner of
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* database */
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/*****************************************************************************
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* pmod.h -- *
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* POSTGRES processing mode definitions. *
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*****************************************************************************/
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/*
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* Description:
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* There are three processing modes in POSTGRES. They are
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* BootstrapProcessing or "bootstrap," InitProcessing or
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* "initialization," and NormalProcessing or "normal."
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*
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* The first two processing modes are used during special times. When the
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* system state indicates bootstrap processing, transactions are all given
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* transaction id "one" and are consequently guaranteed to commit. This mode
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* is used during the initial generation of template databases.
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*
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* Initialization mode: used while starting a backend, until all normal
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* initialization is complete. Some code behaves differently when executed
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* in this mode to enable system bootstrapping.
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*
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* If a POSTGRES binary is in normal mode, then all code may be executed
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* normally.
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*/
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typedef enum ProcessingMode
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{
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BootstrapProcessing, /* bootstrap creation of template database */
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InitProcessing, /* initializing system */
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NormalProcessing /* normal processing */
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} ProcessingMode;
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extern ProcessingMode Mode;
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#define IsBootstrapProcessingMode() ((bool)(Mode == BootstrapProcessing))
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#define IsInitProcessingMode() ((bool)(Mode == InitProcessing))
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#define IsNormalProcessingMode() ((bool)(Mode == NormalProcessing))
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#define SetProcessingMode(mode) \
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do { \
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AssertArg((mode) == BootstrapProcessing || \
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(mode) == InitProcessing || \
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(mode) == NormalProcessing); \
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Mode = (mode); \
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} while(0)
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#define GetProcessingMode() Mode
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/*****************************************************************************
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* pinit.h -- *
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* POSTGRES initialization and cleanup definitions. *
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*****************************************************************************/
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/* in utils/init/postinit.c */
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extern void InitPostgres(const char *dbname, const char *username);
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extern void BaseInit(void);
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/* in utils/init/miscinit.c */
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extern bool CreateDataDirLockFile(const char *datadir, bool amPostmaster);
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extern bool CreateSocketLockFile(const char *socketfile, bool amPostmaster);
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extern void TouchSocketLockFile(void);
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extern void RecordSharedMemoryInLockFile(unsigned long id1,
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unsigned long id2);
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extern void ValidatePgVersion(const char *path);
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/* these externs do not belong here... */
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extern void IgnoreSystemIndexes(bool mode);
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extern bool IsIgnoringSystemIndexes(void);
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extern bool IsCacheInitialized(void);
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#endif /* MISCADMIN_H */
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