/*
* Identify a suitable default timezone setting based on the environment,
* and make it active.
*
* We first look to the TZ environment variable. If not found or not
* recognized by our own code, we see if we can identify the timezone
* from the behavior of the system timezone library. When all else fails,
* fall back to GMT.
*/
static const char *
select_default_timezone(void)
{
const char *def_tz;
def_tz = getenv("TZ");
if (set_global_timezone(def_tz))
return def_tz;
def_tz = identify_system_timezone();
if (set_global_timezone(def_tz))
return def_tz;
if (set_global_timezone("GMT"))
return "GMT";
ereport(FATAL,
(errmsg("could not select a suitable default timezone"),
errdetail("It appears that your GMT time zone uses leap seconds. PostgreSQL does not support leap seconds.")));
return NULL; /* keep compiler quiet */
}
/*
* Identify a suitable default timezone setting based on the environment.
*
* We first look to the TZ environment variable. If not found or not
* recognized by our own code, we see if we can identify the timezone
* from the behavior of the system timezone library. When all else fails,
* fall back to GMT.
*/
static pg_tz *
select_default_timezone(void)
{
pg_tz *def_tz;
def_tz = get_pg_tz_for_zone(getenv("TZ"));
if (def_tz)
return def_tz;
def_tz = get_pg_tz_for_zone(identify_system_timezone());
if (def_tz)
return def_tz;
def_tz = get_pg_tz_for_zone("GMT");
if (def_tz)
return def_tz;
ereport(FATAL,
(errmsg("could not select a suitable default time zone"),
errdetail("It appears that your GMT time zone uses leap seconds. PostgreSQL does not support leap seconds.")));
return NULL; /* keep compiler quiet */
}
/*
* Identify a suitable default timezone setting based on the environment.
*
* The installation share_path must be passed in, as that is the default
* location for the timezone database directory.
*
* We first look to the TZ environment variable. If not found or not
* recognized by our own code, we see if we can identify the timezone
* from the behavior of the system timezone library. When all else fails,
* return NULL, indicating that we should default to GMT.
*/
const char *
select_default_timezone(const char *share_path)
{
const char *tzname;
/* Initialize timezone directory path, if needed */
#ifndef SYSTEMTZDIR
snprintf(tzdirpath, sizeof(tzdirpath), "%s/timezone", share_path);
#endif
/* Check TZ environment variable */
tzname = getenv("TZ");
if (validate_zone(tzname))
return tzname;
/* Nope, so try to identify the system timezone */
tzname = identify_system_timezone();
if (validate_zone(tzname))
return tzname;
return NULL;
}
