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log: Make glib logging go through QEMU

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This commit adds a error_init() helper which calls
g_log_set_default_handler() so that glib logs (g_log, g_warning, ...)
are handled similarly to other QEMU logs. This means they will get a
timestamp if timestamps are enabled, and they will go through the
HMP monitor if one is configured.

This commit also adds a call to error_init() to the binaries
installed by QEMU. Since error_init() also calls error_set_progname(),
this means that *-linux-user, *-bsd-user and qemu-pr-helper messages
output with error_report, info_report, ... will slightly change: they
will be prefixed by the binary name.

glib debug messages are enabled through G_MESSAGES_DEBUG similarly to
the glib default log handler.

At the moment, this change will mostly impact SPICE logging if your
spice version is >= 0.14.1. With older spice versions, this is not going
to work as expected, but will not have any ill effect, so this call is
not conditional on the SPICE version.

Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190131164614.19209-3-cfergeau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Christophe Fergeau 2019-01-31 17:46:14 +01:00 • committed by Markus Armbruster
parent 99e98d7c9f
commit f5852efa29
9 changed files with 65 additions and 6 deletions
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55
util/qemu-error.c
View file

@ -142,7 +142,7 @@ static const char *progname;
/*
* Set the program name for error_print_loc().
*/
void error_set_progname(const char *argv0)
static void error_set_progname(const char *argv0)
{
const char *p = strrchr(argv0, '/');
progname = p ? p + 1 : argv0;
@ -345,3 +345,56 @@ bool warn_report_once_cond(bool *printed, const char *fmt, ...)
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"));
}