qemu/util/qemu-error.c

414 lines
9.8 KiB
C

/*
* Error reporting
*
* Copyright (C) 2010 Red Hat Inc.
*
* Authors:
* Markus Armbruster <armbru@redhat.com>,
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
/*
* @report_type is the type of message: error, warning or
* informational.
*/
typedef enum {
REPORT_TYPE_ERROR,
REPORT_TYPE_WARNING,
REPORT_TYPE_INFO,
} report_type;
/* Prepend timestamp to messages */
bool error_with_timestamp;
bool error_with_guestname;
const char *error_guest_name;
int error_printf(const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = error_vprintf(fmt, ap);
va_end(ap);
return ret;
}
int error_printf_unless_qmp(const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = error_vprintf_unless_qmp(fmt, ap);
va_end(ap);
return ret;
}
static Location std_loc = {
.kind = LOC_NONE
};
static Location *cur_loc = &std_loc;
/*
* Push location saved in LOC onto the location stack, return it.
* The top of that stack is the current location.
* Needs a matching loc_pop().
*/
Location *loc_push_restore(Location *loc)
{
assert(!loc->prev);
loc->prev = cur_loc;
cur_loc = loc;
return loc;
}
/*
* Initialize *LOC to "nowhere", push it onto the location stack.
* The top of that stack is the current location.
* Needs a matching loc_pop().
* Return LOC.
*/
Location *loc_push_none(Location *loc)
{
loc->kind = LOC_NONE;
loc->prev = NULL;
return loc_push_restore(loc);
}
/*
* Pop the location stack.
* LOC must be the current location, i.e. the top of the stack.
*/
Location *loc_pop(Location *loc)
{
assert(cur_loc == loc && loc->prev);
cur_loc = loc->prev;
loc->prev = NULL;
return loc;
}
/*
* Save the current location in LOC, return LOC.
*/
Location *loc_save(Location *loc)
{
*loc = *cur_loc;
loc->prev = NULL;
return loc;
}
/*
* Change the current location to the one saved in LOC.
*/
void loc_restore(Location *loc)
{
Location *prev = cur_loc->prev;
assert(!loc->prev);
*cur_loc = *loc;
cur_loc->prev = prev;
}
/*
* Change the current location to "nowhere in particular".
*/
void loc_set_none(void)
{
cur_loc->kind = LOC_NONE;
}
/*
* Change the current location to argument ARGV[IDX..IDX+CNT-1].
*/
void loc_set_cmdline(char **argv, int idx, int cnt)
{
cur_loc->kind = LOC_CMDLINE;
cur_loc->num = cnt;
cur_loc->ptr = argv + idx;
}
/*
* Change the current location to file FNAME, line LNO.
*/
void loc_set_file(const char *fname, int lno)
{
assert (fname || cur_loc->kind == LOC_FILE);
cur_loc->kind = LOC_FILE;
cur_loc->num = lno;
if (fname) {
cur_loc->ptr = fname;
}
}
static const char *progname;
/*
* Set the program name for error_print_loc().
*/
static void error_set_progname(const char *argv0)
{
const char *p = strrchr(argv0, '/');
progname = p ? p + 1 : argv0;
}
const char *error_get_progname(void)
{
return progname;
}
/*
* Print current location to current monitor if we have one, else to stderr.
*/
static void print_loc(void)
{
const char *sep = "";
int i;
const char *const *argp;
if (!cur_mon && progname) {
fprintf(stderr, "%s:", progname);
sep = " ";
}
switch (cur_loc->kind) {
case LOC_CMDLINE:
argp = cur_loc->ptr;
for (i = 0; i < cur_loc->num; i++) {
error_printf("%s%s", sep, argp[i]);
sep = " ";
}
error_printf(": ");
break;
case LOC_FILE:
error_printf("%s:", (const char *)cur_loc->ptr);
if (cur_loc->num) {
error_printf("%d:", cur_loc->num);
}
error_printf(" ");
break;
default:
error_printf("%s", sep);
}
}
/*
* Print a message to current monitor if we have one, else to stderr.
* @report_type is the type of message: error, warning or informational.
* Format arguments like vsprintf(). The resulting message should be
* a single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
*/
static void vreport(report_type type, const char *fmt, va_list ap)
{
GTimeVal tv;
gchar *timestr;
if (error_with_timestamp && !cur_mon) {
g_get_current_time(&tv);
timestr = g_time_val_to_iso8601(&tv);
error_printf("%s ", timestr);
g_free(timestr);
}
/* Only prepend guest name if -msg guest-name and -name guest=... are set */
if (error_with_guestname && error_guest_name && !cur_mon) {
error_printf("%s ", error_guest_name);
}
print_loc();
switch (type) {
case REPORT_TYPE_ERROR:
break;
case REPORT_TYPE_WARNING:
error_printf("warning: ");
break;
case REPORT_TYPE_INFO:
error_printf("info: ");
break;
}
error_vprintf(fmt, ap);
error_printf("\n");
}
/*
* Print an error message to current monitor if we have one, else to stderr.
* Format arguments like vsprintf(). The resulting message should be
* a single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
* It's wrong to call this in a QMP monitor. Use error_setg() there.
*/
void error_vreport(const char *fmt, va_list ap)
{
vreport(REPORT_TYPE_ERROR, fmt, ap);
}
/*
* Print a warning message to current monitor if we have one, else to stderr.
* Format arguments like vsprintf(). The resulting message should be
* a single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
*/
void warn_vreport(const char *fmt, va_list ap)
{
vreport(REPORT_TYPE_WARNING, fmt, ap);
}
/*
* Print an information message to current monitor if we have one, else to
* stderr.
* Format arguments like vsprintf(). The resulting message should be
* a single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
*/
void info_vreport(const char *fmt, va_list ap)
{
vreport(REPORT_TYPE_INFO, fmt, ap);
}
/*
* Print an error message to current monitor if we have one, else to stderr.
* Format arguments like sprintf(). The resulting message should be
* a single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
* It's wrong to call this in a QMP monitor. Use error_setg() there.
*/
void error_report(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vreport(REPORT_TYPE_ERROR, fmt, ap);
va_end(ap);
}
/*
* Print a warning message to current monitor if we have one, else to stderr.
* Format arguments like sprintf(). The resulting message should be a
* single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
*/
void warn_report(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vreport(REPORT_TYPE_WARNING, fmt, ap);
va_end(ap);
}
/*
* Print an information message to current monitor if we have one, else to
* stderr.
* Format arguments like sprintf(). The resulting message should be a
* single phrase, with no newline or trailing punctuation.
* Prepend the current location and append a newline.
*/
void info_report(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vreport(REPORT_TYPE_INFO, fmt, ap);
va_end(ap);
}
/*
* Like error_report(), except print just once.
* If *printed is false, print the message, and flip *printed to true.
* Return whether the message was printed.
*/
bool error_report_once_cond(bool *printed, const char *fmt, ...)
{
va_list ap;
assert(printed);
if (*printed) {
return false;
}
*printed = true;
va_start(ap, fmt);
vreport(REPORT_TYPE_ERROR, fmt, ap);
va_end(ap);
return true;
}
/*
* Like warn_report(), except print just once.
* If *printed is false, print the message, and flip *printed to true.
* Return whether the message was printed.
*/
bool warn_report_once_cond(bool *printed, const char *fmt, ...)
{
va_list ap;
assert(printed);
if (*printed) {
return false;
}
*printed = true;
va_start(ap, fmt);
vreport(REPORT_TYPE_WARNING, fmt, ap);
va_end(ap);
return true;
}
static char *qemu_glog_domains;
static void qemu_log_func(const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *message,
gpointer user_data)
{
switch (log_level & G_LOG_LEVEL_MASK) {
case G_LOG_LEVEL_DEBUG:
case G_LOG_LEVEL_INFO:
/*
* Use same G_MESSAGES_DEBUG logic as glib to enable/disable debug
* messages
*/
if (qemu_glog_domains == NULL) {
break;
}
if (strcmp(qemu_glog_domains, "all") != 0 &&
(log_domain == NULL || !strstr(qemu_glog_domains, log_domain))) {
break;
}
/* Fall through */
case G_LOG_LEVEL_MESSAGE:
info_report("%s%s%s",
log_domain ?: "", log_domain ? ": " : "", message);
break;
case G_LOG_LEVEL_WARNING:
warn_report("%s%s%s",
log_domain ?: "", log_domain ? ": " : "", message);
break;
case G_LOG_LEVEL_CRITICAL:
case G_LOG_LEVEL_ERROR:
error_report("%s%s%s",
log_domain ?: "", log_domain ? ": " : "", message);
break;
}
}
void error_init(const char *argv0)
{
/* Set the program name for error_print_loc(). */
error_set_progname(argv0);
/*
* This sets up glib logging so libraries using it also print their logs
* through error_report(), warn_report(), info_report().
*/
g_log_set_default_handler(qemu_log_func, NULL);
g_warn_if_fail(qemu_glog_domains == NULL);
qemu_glog_domains = g_strdup(g_getenv("G_MESSAGES_DEBUG"));
}