mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-08 12:59:23 +02:00
They are identical, but the overwhelming majority of the code uses %d, so standardize on that.
1624 lines
44 KiB
C
1624 lines
44 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* pgtz.c
|
|
* Timezone Library Integration Functions
|
|
*
|
|
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
|
|
*
|
|
* IDENTIFICATION
|
|
* src/timezone/pgtz.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#define NO_REDEFINE_TIMEFUNCS
|
|
|
|
#include "postgres.h"
|
|
|
|
#include <ctype.h>
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
#include <time.h>
|
|
|
|
#include "miscadmin.h"
|
|
#include "pgtz.h"
|
|
#include "storage/fd.h"
|
|
#include "tzfile.h"
|
|
#include "utils/datetime.h"
|
|
#include "utils/guc.h"
|
|
#include "utils/hsearch.h"
|
|
|
|
/* Current session timezone (controlled by TimeZone GUC) */
|
|
pg_tz *session_timezone = NULL;
|
|
|
|
/* Current log timezone (controlled by log_timezone GUC) */
|
|
pg_tz *log_timezone = NULL;
|
|
|
|
/* Fallback GMT timezone for last-ditch error message formatting */
|
|
pg_tz *gmt_timezone = NULL;
|
|
static pg_tz gmt_timezone_data;
|
|
|
|
|
|
static bool scan_directory_ci(const char *dirname,
|
|
const char *fname, int fnamelen,
|
|
char *canonname, int canonnamelen);
|
|
static const char *identify_system_timezone(void);
|
|
static pg_tz *get_pg_tz_for_zone(const char *tzname);
|
|
static pg_tz *select_default_timezone(void);
|
|
|
|
|
|
/*
|
|
* Return full pathname of timezone data directory
|
|
*/
|
|
static const char *
|
|
pg_TZDIR(void)
|
|
{
|
|
#ifndef SYSTEMTZDIR
|
|
/* normal case: timezone stuff is under our share dir */
|
|
static bool done_tzdir = false;
|
|
static char tzdir[MAXPGPATH];
|
|
|
|
if (done_tzdir)
|
|
return tzdir;
|
|
|
|
get_share_path(my_exec_path, tzdir);
|
|
strlcpy(tzdir + strlen(tzdir), "/timezone", MAXPGPATH - strlen(tzdir));
|
|
|
|
done_tzdir = true;
|
|
return tzdir;
|
|
#else
|
|
/* we're configured to use system's timezone database */
|
|
return SYSTEMTZDIR;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Given a timezone name, open() the timezone data file. Return the
|
|
* file descriptor if successful, -1 if not.
|
|
*
|
|
* The input name is searched for case-insensitively (we assume that the
|
|
* timezone database does not contain case-equivalent names).
|
|
*
|
|
* If "canonname" is not NULL, then on success the canonical spelling of the
|
|
* given name is stored there (it is assumed to be > TZ_STRLEN_MAX bytes!).
|
|
*/
|
|
int
|
|
pg_open_tzfile(const char *name, char *canonname)
|
|
{
|
|
const char *fname;
|
|
char fullname[MAXPGPATH];
|
|
int fullnamelen;
|
|
int orignamelen;
|
|
|
|
/*
|
|
* Loop to split the given name into directory levels; for each level,
|
|
* search using scan_directory_ci().
|
|
*/
|
|
strcpy(fullname, pg_TZDIR());
|
|
orignamelen = fullnamelen = strlen(fullname);
|
|
fname = name;
|
|
for (;;)
|
|
{
|
|
const char *slashptr;
|
|
int fnamelen;
|
|
|
|
slashptr = strchr(fname, '/');
|
|
if (slashptr)
|
|
fnamelen = slashptr - fname;
|
|
else
|
|
fnamelen = strlen(fname);
|
|
if (fullnamelen + 1 + fnamelen >= MAXPGPATH)
|
|
return -1; /* not gonna fit */
|
|
if (!scan_directory_ci(fullname, fname, fnamelen,
|
|
fullname + fullnamelen + 1,
|
|
MAXPGPATH - fullnamelen - 1))
|
|
return -1;
|
|
fullname[fullnamelen++] = '/';
|
|
fullnamelen += strlen(fullname + fullnamelen);
|
|
if (slashptr)
|
|
fname = slashptr + 1;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (canonname)
|
|
strlcpy(canonname, fullname + orignamelen + 1, TZ_STRLEN_MAX + 1);
|
|
|
|
return open(fullname, O_RDONLY | PG_BINARY, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Scan specified directory for a case-insensitive match to fname
|
|
* (of length fnamelen --- fname may not be null terminated!). If found,
|
|
* copy the actual filename into canonname and return true.
|
|
*/
|
|
static bool
|
|
scan_directory_ci(const char *dirname, const char *fname, int fnamelen,
|
|
char *canonname, int canonnamelen)
|
|
{
|
|
bool found = false;
|
|
DIR *dirdesc;
|
|
struct dirent *direntry;
|
|
|
|
dirdesc = AllocateDir(dirname);
|
|
if (!dirdesc)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open directory \"%s\": %m", dirname)));
|
|
return false;
|
|
}
|
|
|
|
while ((direntry = ReadDir(dirdesc, dirname)) != NULL)
|
|
{
|
|
/*
|
|
* Ignore . and .., plus any other "hidden" files. This is a security
|
|
* measure to prevent access to files outside the timezone directory.
|
|
*/
|
|
if (direntry->d_name[0] == '.')
|
|
continue;
|
|
|
|
if (strlen(direntry->d_name) == fnamelen &&
|
|
pg_strncasecmp(direntry->d_name, fname, fnamelen) == 0)
|
|
{
|
|
/* Found our match */
|
|
strlcpy(canonname, direntry->d_name, canonnamelen);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
FreeDir(dirdesc);
|
|
|
|
return found;
|
|
}
|
|
|
|
|
|
/*
|
|
* The following block of code attempts to determine which timezone in our
|
|
* timezone database is the best match for the active system timezone.
|
|
*
|
|
* On most systems, we rely on trying to match the observable behavior of
|
|
* the C library's localtime() function. The database zone that matches
|
|
* furthest into the past is the one to use. Often there will be several
|
|
* zones with identical rankings (since the zic database assigns multiple
|
|
* names to many zones). We break ties arbitrarily by preferring shorter,
|
|
* then alphabetically earlier zone names.
|
|
*
|
|
* Win32's native knowledge about timezones appears to be too incomplete
|
|
* and too different from the zic database for the above matching strategy
|
|
* to be of any use. But there is just a limited number of timezones
|
|
* available, so we can rely on a handmade mapping table instead.
|
|
*/
|
|
|
|
#ifndef WIN32
|
|
|
|
#define T_DAY ((time_t) (60*60*24))
|
|
#define T_WEEK ((time_t) (60*60*24*7))
|
|
#define T_MONTH ((time_t) (60*60*24*31))
|
|
|
|
#define MAX_TEST_TIMES (52*100) /* 100 years */
|
|
|
|
struct tztry
|
|
{
|
|
int n_test_times;
|
|
time_t test_times[MAX_TEST_TIMES];
|
|
};
|
|
|
|
static void scan_available_timezones(char *tzdir, char *tzdirsub,
|
|
struct tztry * tt,
|
|
int *bestscore, char *bestzonename);
|
|
|
|
|
|
/*
|
|
* Get GMT offset from a system struct tm
|
|
*/
|
|
static int
|
|
get_timezone_offset(struct tm * tm)
|
|
{
|
|
#if defined(HAVE_STRUCT_TM_TM_ZONE)
|
|
return tm->tm_gmtoff;
|
|
#elif defined(HAVE_INT_TIMEZONE)
|
|
return -TIMEZONE_GLOBAL;
|
|
#else
|
|
#error No way to determine TZ? Can this happen?
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Convenience subroutine to convert y/m/d to time_t (NOT pg_time_t)
|
|
*/
|
|
static time_t
|
|
build_time_t(int year, int month, int day)
|
|
{
|
|
struct tm tm;
|
|
|
|
memset(&tm, 0, sizeof(tm));
|
|
tm.tm_mday = day;
|
|
tm.tm_mon = month - 1;
|
|
tm.tm_year = year - 1900;
|
|
|
|
return mktime(&tm);
|
|
}
|
|
|
|
/*
|
|
* Does a system tm value match one we computed ourselves?
|
|
*/
|
|
static bool
|
|
compare_tm(struct tm * s, struct pg_tm * p)
|
|
{
|
|
if (s->tm_sec != p->tm_sec ||
|
|
s->tm_min != p->tm_min ||
|
|
s->tm_hour != p->tm_hour ||
|
|
s->tm_mday != p->tm_mday ||
|
|
s->tm_mon != p->tm_mon ||
|
|
s->tm_year != p->tm_year ||
|
|
s->tm_wday != p->tm_wday ||
|
|
s->tm_yday != p->tm_yday ||
|
|
s->tm_isdst != p->tm_isdst)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* See how well a specific timezone setting matches the system behavior
|
|
*
|
|
* We score a timezone setting according to the number of test times it
|
|
* matches. (The test times are ordered later-to-earlier, but this routine
|
|
* doesn't actually know that; it just scans until the first non-match.)
|
|
*
|
|
* We return -1 for a completely unusable setting; this is worse than the
|
|
* score of zero for a setting that works but matches not even the first
|
|
* test time.
|
|
*/
|
|
static int
|
|
score_timezone(const char *tzname, struct tztry * tt)
|
|
{
|
|
int i;
|
|
pg_time_t pgtt;
|
|
struct tm *systm;
|
|
struct pg_tm *pgtm;
|
|
char cbuf[TZ_STRLEN_MAX + 1];
|
|
pg_tz tz;
|
|
|
|
|
|
/*
|
|
* Load timezone directly. Don't use pg_tzset, because we don't want all
|
|
* timezones loaded in the cache at startup.
|
|
*/
|
|
if (tzload(tzname, NULL, &tz.state, TRUE) != 0)
|
|
{
|
|
if (tzname[0] == ':' || tzparse(tzname, &tz.state, FALSE) != 0)
|
|
{
|
|
return -1; /* can't handle the TZ name at all */
|
|
}
|
|
}
|
|
|
|
/* Reject if leap seconds involved */
|
|
if (!tz_acceptable(&tz))
|
|
{
|
|
elog(DEBUG4, "Reject TZ \"%s\": uses leap seconds", tzname);
|
|
return -1;
|
|
}
|
|
|
|
/* Check for match at all the test times */
|
|
for (i = 0; i < tt->n_test_times; i++)
|
|
{
|
|
pgtt = (pg_time_t) (tt->test_times[i]);
|
|
pgtm = pg_localtime(&pgtt, &tz);
|
|
if (!pgtm)
|
|
return -1; /* probably shouldn't happen */
|
|
systm = localtime(&(tt->test_times[i]));
|
|
if (!systm)
|
|
{
|
|
elog(DEBUG4, "TZ \"%s\" scores %d: at %ld %04d-%02d-%02d %02d:%02d:%02d %s, system had no data",
|
|
tzname, i, (long) pgtt,
|
|
pgtm->tm_year + 1900, pgtm->tm_mon + 1, pgtm->tm_mday,
|
|
pgtm->tm_hour, pgtm->tm_min, pgtm->tm_sec,
|
|
pgtm->tm_isdst ? "dst" : "std");
|
|
return i;
|
|
}
|
|
if (!compare_tm(systm, pgtm))
|
|
{
|
|
elog(DEBUG4, "TZ \"%s\" scores %d: at %ld %04d-%02d-%02d %02d:%02d:%02d %s versus %04d-%02d-%02d %02d:%02d:%02d %s",
|
|
tzname, i, (long) pgtt,
|
|
pgtm->tm_year + 1900, pgtm->tm_mon + 1, pgtm->tm_mday,
|
|
pgtm->tm_hour, pgtm->tm_min, pgtm->tm_sec,
|
|
pgtm->tm_isdst ? "dst" : "std",
|
|
systm->tm_year + 1900, systm->tm_mon + 1, systm->tm_mday,
|
|
systm->tm_hour, systm->tm_min, systm->tm_sec,
|
|
systm->tm_isdst ? "dst" : "std");
|
|
return i;
|
|
}
|
|
if (systm->tm_isdst >= 0)
|
|
{
|
|
/* Check match of zone names, too */
|
|
if (pgtm->tm_zone == NULL)
|
|
return -1; /* probably shouldn't happen */
|
|
memset(cbuf, 0, sizeof(cbuf));
|
|
strftime(cbuf, sizeof(cbuf) - 1, "%Z", systm); /* zone abbr */
|
|
if (strcmp(cbuf, pgtm->tm_zone) != 0)
|
|
{
|
|
elog(DEBUG4, "TZ \"%s\" scores %d: at %ld \"%s\" versus \"%s\"",
|
|
tzname, i, (long) pgtt,
|
|
pgtm->tm_zone, cbuf);
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
|
|
elog(DEBUG4, "TZ \"%s\" gets max score %d", tzname, i);
|
|
return i;
|
|
}
|
|
|
|
|
|
/*
|
|
* Try to identify a timezone name (in our terminology) that best matches the
|
|
* observed behavior of the system timezone library. We cannot assume that
|
|
* the system TZ environment setting (if indeed there is one) matches our
|
|
* terminology, so we ignore it and just look at what localtime() returns.
|
|
*/
|
|
static const char *
|
|
identify_system_timezone(void)
|
|
{
|
|
static char resultbuf[TZ_STRLEN_MAX + 1];
|
|
time_t tnow;
|
|
time_t t;
|
|
struct tztry tt;
|
|
struct tm *tm;
|
|
int thisyear;
|
|
int bestscore;
|
|
char tmptzdir[MAXPGPATH];
|
|
int std_ofs;
|
|
char std_zone_name[TZ_STRLEN_MAX + 1],
|
|
dst_zone_name[TZ_STRLEN_MAX + 1];
|
|
char cbuf[TZ_STRLEN_MAX + 1];
|
|
|
|
/* Initialize OS timezone library */
|
|
tzset();
|
|
|
|
/*
|
|
* Set up the list of dates to be probed to see how well our timezone
|
|
* matches the system zone. We first probe January and July of the
|
|
* current year; this serves to quickly eliminate the vast majority of the
|
|
* TZ database entries. If those dates match, we probe every week for 100
|
|
* years backwards from the current July. (Weekly resolution is good
|
|
* enough to identify DST transition rules, since everybody switches on
|
|
* Sundays.) This is sufficient to cover most of the Unix time_t range,
|
|
* and we don't want to look further than that since many systems won't
|
|
* have sane TZ behavior further back anyway. The further back the zone
|
|
* matches, the better we score it. This may seem like a rather random
|
|
* way of doing things, but experience has shown that system-supplied
|
|
* timezone definitions are likely to have DST behavior that is right for
|
|
* the recent past and not so accurate further back. Scoring in this way
|
|
* allows us to recognize zones that have some commonality with the zic
|
|
* database, without insisting on exact match. (Note: we probe Thursdays,
|
|
* not Sundays, to avoid triggering DST-transition bugs in localtime
|
|
* itself.)
|
|
*/
|
|
tnow = time(NULL);
|
|
tm = localtime(&tnow);
|
|
if (!tm)
|
|
return NULL; /* give up if localtime is broken... */
|
|
thisyear = tm->tm_year + 1900;
|
|
|
|
t = build_time_t(thisyear, 1, 15);
|
|
|
|
/*
|
|
* Round back to GMT midnight Thursday. This depends on the knowledge
|
|
* that the time_t origin is Thu Jan 01 1970. (With a different origin
|
|
* we'd be probing some other day of the week, but it wouldn't matter
|
|
* anyway unless localtime() had DST-transition bugs.)
|
|
*/
|
|
t -= (t % T_WEEK);
|
|
|
|
tt.n_test_times = 0;
|
|
tt.test_times[tt.n_test_times++] = t;
|
|
|
|
t = build_time_t(thisyear, 7, 15);
|
|
t -= (t % T_WEEK);
|
|
|
|
tt.test_times[tt.n_test_times++] = t;
|
|
|
|
while (tt.n_test_times < MAX_TEST_TIMES)
|
|
{
|
|
t -= T_WEEK;
|
|
tt.test_times[tt.n_test_times++] = t;
|
|
}
|
|
|
|
/* Search for the best-matching timezone file */
|
|
strcpy(tmptzdir, pg_TZDIR());
|
|
bestscore = -1;
|
|
resultbuf[0] = '\0';
|
|
scan_available_timezones(tmptzdir, tmptzdir + strlen(tmptzdir) + 1,
|
|
&tt,
|
|
&bestscore, resultbuf);
|
|
if (bestscore > 0)
|
|
{
|
|
/* Ignore zic's rather silly "Factory" time zone; use GMT instead */
|
|
if (strcmp(resultbuf, "Factory") == 0)
|
|
return NULL;
|
|
return resultbuf;
|
|
}
|
|
|
|
/*
|
|
* Couldn't find a match in the database, so next we try constructed zone
|
|
* names (like "PST8PDT").
|
|
*
|
|
* First we need to determine the names of the local standard and daylight
|
|
* zones. The idea here is to scan forward from today until we have seen
|
|
* both zones, if both are in use.
|
|
*/
|
|
memset(std_zone_name, 0, sizeof(std_zone_name));
|
|
memset(dst_zone_name, 0, sizeof(dst_zone_name));
|
|
std_ofs = 0;
|
|
|
|
tnow = time(NULL);
|
|
|
|
/*
|
|
* Round back to a GMT midnight so results don't depend on local time of
|
|
* day
|
|
*/
|
|
tnow -= (tnow % T_DAY);
|
|
|
|
/*
|
|
* We have to look a little further ahead than one year, in case today is
|
|
* just past a DST boundary that falls earlier in the year than the next
|
|
* similar boundary. Arbitrarily scan up to 14 months.
|
|
*/
|
|
for (t = tnow; t <= tnow + T_MONTH * 14; t += T_MONTH)
|
|
{
|
|
tm = localtime(&t);
|
|
if (!tm)
|
|
continue;
|
|
if (tm->tm_isdst < 0)
|
|
continue;
|
|
if (tm->tm_isdst == 0 && std_zone_name[0] == '\0')
|
|
{
|
|
/* found STD zone */
|
|
memset(cbuf, 0, sizeof(cbuf));
|
|
strftime(cbuf, sizeof(cbuf) - 1, "%Z", tm); /* zone abbr */
|
|
strcpy(std_zone_name, cbuf);
|
|
std_ofs = get_timezone_offset(tm);
|
|
}
|
|
if (tm->tm_isdst > 0 && dst_zone_name[0] == '\0')
|
|
{
|
|
/* found DST zone */
|
|
memset(cbuf, 0, sizeof(cbuf));
|
|
strftime(cbuf, sizeof(cbuf) - 1, "%Z", tm); /* zone abbr */
|
|
strcpy(dst_zone_name, cbuf);
|
|
}
|
|
/* Done if found both */
|
|
if (std_zone_name[0] && dst_zone_name[0])
|
|
break;
|
|
}
|
|
|
|
/* We should have found a STD zone name by now... */
|
|
if (std_zone_name[0] == '\0')
|
|
{
|
|
ereport(LOG,
|
|
(errmsg("could not determine system time zone"),
|
|
errdetail("The PostgreSQL time zone will be set to \"%s\".",
|
|
"GMT"),
|
|
errhint("You can specify the correct timezone in postgresql.conf.")));
|
|
return NULL; /* go to GMT */
|
|
}
|
|
|
|
/* If we found DST then try STD<ofs>DST */
|
|
if (dst_zone_name[0] != '\0')
|
|
{
|
|
snprintf(resultbuf, sizeof(resultbuf), "%s%d%s",
|
|
std_zone_name, -std_ofs / 3600, dst_zone_name);
|
|
if (score_timezone(resultbuf, &tt) > 0)
|
|
return resultbuf;
|
|
}
|
|
|
|
/* Try just the STD timezone (works for GMT at least) */
|
|
strcpy(resultbuf, std_zone_name);
|
|
if (score_timezone(resultbuf, &tt) > 0)
|
|
return resultbuf;
|
|
|
|
/* Try STD<ofs> */
|
|
snprintf(resultbuf, sizeof(resultbuf), "%s%d",
|
|
std_zone_name, -std_ofs / 3600);
|
|
if (score_timezone(resultbuf, &tt) > 0)
|
|
return resultbuf;
|
|
|
|
/*
|
|
* Did not find the timezone. Fallback to use a GMT zone. Note that the
|
|
* zic timezone database names the GMT-offset zones in POSIX style: plus
|
|
* is west of Greenwich. It's unfortunate that this is opposite of SQL
|
|
* conventions. Should we therefore change the names? Probably not...
|
|
*/
|
|
snprintf(resultbuf, sizeof(resultbuf), "Etc/GMT%s%d",
|
|
(-std_ofs > 0) ? "+" : "", -std_ofs / 3600);
|
|
|
|
ereport(LOG,
|
|
(errmsg("could not recognize system time zone"),
|
|
errdetail("The PostgreSQL time zone will be set to \"%s\".",
|
|
resultbuf),
|
|
errhint("You can specify the correct timezone in postgresql.conf.")));
|
|
return resultbuf;
|
|
}
|
|
|
|
/*
|
|
* Recursively scan the timezone database looking for the best match to
|
|
* the system timezone behavior.
|
|
*
|
|
* tzdir points to a buffer of size MAXPGPATH. On entry, it holds the
|
|
* pathname of a directory containing TZ files. We internally modify it
|
|
* to hold pathnames of sub-directories and files, but must restore it
|
|
* to its original contents before exit.
|
|
*
|
|
* tzdirsub points to the part of tzdir that represents the subfile name
|
|
* (ie, tzdir + the original directory name length, plus one for the
|
|
* first added '/').
|
|
*
|
|
* tt tells about the system timezone behavior we need to match.
|
|
*
|
|
* *bestscore and *bestzonename on entry hold the best score found so far
|
|
* and the name of the best zone. We overwrite them if we find a better
|
|
* score. bestzonename must be a buffer of length TZ_STRLEN_MAX + 1.
|
|
*/
|
|
static void
|
|
scan_available_timezones(char *tzdir, char *tzdirsub, struct tztry * tt,
|
|
int *bestscore, char *bestzonename)
|
|
{
|
|
int tzdir_orig_len = strlen(tzdir);
|
|
DIR *dirdesc;
|
|
struct dirent *direntry;
|
|
|
|
dirdesc = AllocateDir(tzdir);
|
|
if (!dirdesc)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open directory \"%s\": %m", tzdir)));
|
|
return;
|
|
}
|
|
|
|
while ((direntry = ReadDir(dirdesc, tzdir)) != NULL)
|
|
{
|
|
struct stat statbuf;
|
|
|
|
/* Ignore . and .., plus any other "hidden" files */
|
|
if (direntry->d_name[0] == '.')
|
|
continue;
|
|
|
|
snprintf(tzdir + tzdir_orig_len, MAXPGPATH - tzdir_orig_len,
|
|
"/%s", direntry->d_name);
|
|
|
|
if (stat(tzdir, &statbuf) != 0)
|
|
{
|
|
ereport(LOG,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not stat \"%s\": %m", tzdir)));
|
|
tzdir[tzdir_orig_len] = '\0';
|
|
continue;
|
|
}
|
|
|
|
if (S_ISDIR(statbuf.st_mode))
|
|
{
|
|
/* Recurse into subdirectory */
|
|
scan_available_timezones(tzdir, tzdirsub, tt,
|
|
bestscore, bestzonename);
|
|
}
|
|
else
|
|
{
|
|
/* Load and test this file */
|
|
int score = score_timezone(tzdirsub, tt);
|
|
|
|
if (score > *bestscore)
|
|
{
|
|
*bestscore = score;
|
|
strlcpy(bestzonename, tzdirsub, TZ_STRLEN_MAX + 1);
|
|
}
|
|
else if (score == *bestscore)
|
|
{
|
|
/* Consider how to break a tie */
|
|
if (strlen(tzdirsub) < strlen(bestzonename) ||
|
|
(strlen(tzdirsub) == strlen(bestzonename) &&
|
|
strcmp(tzdirsub, bestzonename) < 0))
|
|
strlcpy(bestzonename, tzdirsub, TZ_STRLEN_MAX + 1);
|
|
}
|
|
}
|
|
|
|
/* Restore tzdir */
|
|
tzdir[tzdir_orig_len] = '\0';
|
|
}
|
|
|
|
FreeDir(dirdesc);
|
|
}
|
|
#else /* WIN32 */
|
|
|
|
static const struct
|
|
{
|
|
const char *stdname; /* Windows name of standard timezone */
|
|
const char *dstname; /* Windows name of daylight timezone */
|
|
const char *pgtzname; /* Name of pgsql timezone to map to */
|
|
} win32_tzmap[] =
|
|
|
|
{
|
|
/*
|
|
* This list was built from the contents of the registry at
|
|
* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time
|
|
* Zones on Windows 2003 R2.
|
|
*
|
|
* The zones have been matched to zic timezones by looking at the cities
|
|
* listed in the win32 display name (in the comment here) in most cases.
|
|
*/
|
|
{
|
|
"Afghanistan Standard Time", "Afghanistan Daylight Time",
|
|
"Asia/Kabul"
|
|
}, /* (GMT+04:30) Kabul */
|
|
{
|
|
"Alaskan Standard Time", "Alaskan Daylight Time",
|
|
"US/Alaska"
|
|
}, /* (GMT-09:00) Alaska */
|
|
{
|
|
"Arab Standard Time", "Arab Daylight Time",
|
|
"Asia/Kuwait"
|
|
}, /* (GMT+03:00) Kuwait, Riyadh */
|
|
{
|
|
"Arabian Standard Time", "Arabian Daylight Time",
|
|
"Asia/Muscat"
|
|
}, /* (GMT+04:00) Abu Dhabi, Muscat */
|
|
{
|
|
"Arabic Standard Time", "Arabic Daylight Time",
|
|
"Asia/Baghdad"
|
|
}, /* (GMT+03:00) Baghdad */
|
|
{
|
|
"Argentina Standard Time", "Argentina Daylight Time",
|
|
"America/Buenos_Aires"
|
|
}, /* (GMT-03:00) Buenos Aires */
|
|
{
|
|
"Armenian Standard Time", "Armenian Daylight Time",
|
|
"Asia/Yerevan"
|
|
}, /* (GMT+04:00) Yerevan */
|
|
{
|
|
"Atlantic Standard Time", "Atlantic Daylight Time",
|
|
"Canada/Atlantic"
|
|
}, /* (GMT-04:00) Atlantic Time (Canada) */
|
|
{
|
|
"AUS Central Standard Time", "AUS Central Daylight Time",
|
|
"Australia/Darwin"
|
|
}, /* (GMT+09:30) Darwin */
|
|
{
|
|
"AUS Eastern Standard Time", "AUS Eastern Daylight Time",
|
|
"Australia/Canberra"
|
|
}, /* (GMT+10:00) Canberra, Melbourne, Sydney */
|
|
{
|
|
"Azerbaijan Standard Time", "Azerbaijan Daylight Time",
|
|
"Asia/Baku"
|
|
}, /* (GMT+04:00) Baku */
|
|
{
|
|
"Azores Standard Time", "Azores Daylight Time",
|
|
"Atlantic/Azores"
|
|
}, /* (GMT-01:00) Azores */
|
|
{
|
|
"Bangladesh Standard Time", "Bangladesh Daylight Time",
|
|
"Asia/Dhaka"
|
|
}, /* (GMT+06:00) Dhaka */
|
|
{
|
|
"Canada Central Standard Time", "Canada Central Daylight Time",
|
|
"Canada/Saskatchewan"
|
|
}, /* (GMT-06:00) Saskatchewan */
|
|
{
|
|
"Cape Verde Standard Time", "Cape Verde Daylight Time",
|
|
"Atlantic/Cape_Verde"
|
|
}, /* (GMT-01:00) Cape Verde Is. */
|
|
{
|
|
"Caucasus Standard Time", "Caucasus Daylight Time",
|
|
"Asia/Baku"
|
|
}, /* (GMT+04:00) Baku, Tbilisi, Yerevan */
|
|
{
|
|
"Cen. Australia Standard Time", "Cen. Australia Daylight Time",
|
|
"Australia/Adelaide"
|
|
}, /* (GMT+09:30) Adelaide */
|
|
{
|
|
"Central America Standard Time", "Central America Daylight Time",
|
|
"CST6CDT"
|
|
}, /* (GMT-06:00) Central America */
|
|
{
|
|
"Central Asia Standard Time", "Central Asia Daylight Time",
|
|
"Asia/Dhaka"
|
|
}, /* (GMT+06:00) Astana, Dhaka */
|
|
{
|
|
"Central Brazilian Standard Time", "Central Brazilian Daylight Time",
|
|
"America/Cuiaba"
|
|
}, /* (GMT-04:00) Cuiaba */
|
|
{
|
|
"Central Europe Standard Time", "Central Europe Daylight Time",
|
|
"Europe/Belgrade"
|
|
}, /* (GMT+01:00) Belgrade, Bratislava, Budapest,
|
|
* Ljubljana, Prague */
|
|
{
|
|
"Central European Standard Time", "Central European Daylight Time",
|
|
"Europe/Sarajevo"
|
|
}, /* (GMT+01:00) Sarajevo, Skopje, Warsaw,
|
|
* Zagreb */
|
|
{
|
|
"Central Pacific Standard Time", "Central Pacific Daylight Time",
|
|
"Pacific/Noumea"
|
|
}, /* (GMT+11:00) Magadan, Solomon Is., New
|
|
* Caledonia */
|
|
{
|
|
"Central Standard Time", "Central Daylight Time",
|
|
"US/Central"
|
|
}, /* (GMT-06:00) Central Time (US & Canada) */
|
|
{
|
|
"Central Standard Time (Mexico)", "Central Daylight Time (Mexico)",
|
|
"America/Mexico_City"
|
|
}, /* (GMT-06:00) Guadalajara, Mexico City,
|
|
* Monterrey - New */
|
|
{
|
|
"China Standard Time", "China Daylight Time",
|
|
"Asia/Hong_Kong"
|
|
}, /* (GMT+08:00) Beijing, Chongqing, Hong Kong,
|
|
* Urumqi */
|
|
{
|
|
"Dateline Standard Time", "Dateline Daylight Time",
|
|
"Etc/GMT+12"
|
|
}, /* (GMT-12:00) International Date Line West */
|
|
{
|
|
"E. Africa Standard Time", "E. Africa Daylight Time",
|
|
"Africa/Nairobi"
|
|
}, /* (GMT+03:00) Nairobi */
|
|
{
|
|
"E. Australia Standard Time", "E. Australia Daylight Time",
|
|
"Australia/Brisbane"
|
|
}, /* (GMT+10:00) Brisbane */
|
|
{
|
|
"E. Europe Standard Time", "E. Europe Daylight Time",
|
|
"Europe/Bucharest"
|
|
}, /* (GMT+02:00) Bucharest */
|
|
{
|
|
"E. South America Standard Time", "E. South America Daylight Time",
|
|
"America/Araguaina"
|
|
}, /* (GMT-03:00) Brasilia */
|
|
{
|
|
"Eastern Standard Time", "Eastern Daylight Time",
|
|
"US/Eastern"
|
|
}, /* (GMT-05:00) Eastern Time (US & Canada) */
|
|
{
|
|
"Egypt Standard Time", "Egypt Daylight Time",
|
|
"Africa/Cairo"
|
|
}, /* (GMT+02:00) Cairo */
|
|
{
|
|
"Ekaterinburg Standard Time", "Ekaterinburg Daylight Time",
|
|
"Asia/Yekaterinburg"
|
|
}, /* (GMT+05:00) Ekaterinburg */
|
|
{
|
|
"Fiji Standard Time", "Fiji Daylight Time",
|
|
"Pacific/Fiji"
|
|
}, /* (GMT+12:00) Fiji, Kamchatka, Marshall Is. */
|
|
{
|
|
"FLE Standard Time", "FLE Daylight Time",
|
|
"Europe/Helsinki"
|
|
}, /* (GMT+02:00) Helsinki, Kyiv, Riga, Sofia,
|
|
* Tallinn, Vilnius */
|
|
{
|
|
"Georgian Standard Time", "Georgian Daylight Time",
|
|
"Asia/Tbilisi"
|
|
}, /* (GMT+03:00) Tbilisi */
|
|
{
|
|
"GMT Standard Time", "GMT Daylight Time",
|
|
"Europe/London"
|
|
}, /* (GMT) Greenwich Mean Time : Dublin,
|
|
* Edinburgh, Lisbon, London */
|
|
{
|
|
"Greenland Standard Time", "Greenland Daylight Time",
|
|
"America/Godthab"
|
|
}, /* (GMT-03:00) Greenland */
|
|
{
|
|
"Greenwich Standard Time", "Greenwich Daylight Time",
|
|
"Africa/Casablanca"
|
|
}, /* (GMT) Casablanca, Monrovia */
|
|
{
|
|
"GTB Standard Time", "GTB Daylight Time",
|
|
"Europe/Athens"
|
|
}, /* (GMT+02:00) Athens, Istanbul, Minsk */
|
|
{
|
|
"Hawaiian Standard Time", "Hawaiian Daylight Time",
|
|
"US/Hawaii"
|
|
}, /* (GMT-10:00) Hawaii */
|
|
{
|
|
"India Standard Time", "India Daylight Time",
|
|
"Asia/Calcutta"
|
|
}, /* (GMT+05:30) Chennai, Kolkata, Mumbai, New
|
|
* Delhi */
|
|
{
|
|
"Iran Standard Time", "Iran Daylight Time",
|
|
"Asia/Tehran"
|
|
}, /* (GMT+03:30) Tehran */
|
|
{
|
|
"Jerusalem Standard Time", "Jerusalem Daylight Time",
|
|
"Asia/Jerusalem"
|
|
}, /* (GMT+02:00) Jerusalem */
|
|
{
|
|
"Jordan Standard Time", "Jordan Daylight Time",
|
|
"Asia/Amman"
|
|
}, /* (GMT+02:00) Amman */
|
|
{
|
|
"Kamchatka Standard Time", "Kamchatka Daylight Time",
|
|
"Asia/Kamchatka"
|
|
}, /* (GMT+12:00) Petropavlovsk-Kamchatsky */
|
|
{
|
|
"Korea Standard Time", "Korea Daylight Time",
|
|
"Asia/Seoul"
|
|
}, /* (GMT+09:00) Seoul */
|
|
{
|
|
"Mauritius Standard Time", "Mauritius Daylight Time",
|
|
"Indian/Mauritius"
|
|
}, /* (GMT+04:00) Port Louis */
|
|
{
|
|
"Mexico Standard Time", "Mexico Daylight Time",
|
|
"America/Mexico_City"
|
|
}, /* (GMT-06:00) Guadalajara, Mexico City,
|
|
* Monterrey */
|
|
{
|
|
"Mexico Standard Time 2", "Mexico Daylight Time 2",
|
|
"America/Chihuahua"
|
|
}, /* (GMT-07:00) Chihuahua, La Paz, Mazatlan */
|
|
{
|
|
"Mid-Atlantic Standard Time", "Mid-Atlantic Daylight Time",
|
|
"Atlantic/South_Georgia"
|
|
}, /* (GMT-02:00) Mid-Atlantic */
|
|
{
|
|
"Middle East Standard Time", "Middle East Daylight Time",
|
|
"Asia/Beirut"
|
|
}, /* (GMT+02:00) Beirut */
|
|
{
|
|
"Montevideo Standard Time", "Montevideo Daylight Time",
|
|
"America/Montevideo"
|
|
}, /* (GMT-03:00) Montevideo */
|
|
{
|
|
"Morocco Standard Time", "Morocco Daylight Time",
|
|
"Africa/Casablanca"
|
|
}, /* (GMT) Casablanca */
|
|
{
|
|
"Mountain Standard Time", "Mountain Daylight Time",
|
|
"US/Mountain"
|
|
}, /* (GMT-07:00) Mountain Time (US & Canada) */
|
|
{
|
|
"Mountain Standard Time (Mexico)", "Mountain Daylight Time (Mexico)",
|
|
"America/Chihuahua"
|
|
}, /* (GMT-07:00) Chihuahua, La Paz, Mazatlan -
|
|
* New */
|
|
{
|
|
"Myanmar Standard Time", "Myanmar Daylight Time",
|
|
"Asia/Rangoon"
|
|
}, /* (GMT+06:30) Rangoon */
|
|
{
|
|
"N. Central Asia Standard Time", "N. Central Asia Daylight Time",
|
|
"Asia/Novosibirsk"
|
|
}, /* (GMT+06:00) Novosibirsk */
|
|
{
|
|
"Namibia Standard Time", "Namibia Daylight Time",
|
|
"Africa/Windhoek"
|
|
}, /* (GMT+02:00) Windhoek */
|
|
{
|
|
"Nepal Standard Time", "Nepal Daylight Time",
|
|
"Asia/Katmandu"
|
|
}, /* (GMT+05:45) Kathmandu */
|
|
{
|
|
"New Zealand Standard Time", "New Zealand Daylight Time",
|
|
"Pacific/Auckland"
|
|
}, /* (GMT+12:00) Auckland, Wellington */
|
|
{
|
|
"Newfoundland Standard Time", "Newfoundland Daylight Time",
|
|
"Canada/Newfoundland"
|
|
}, /* (GMT-03:30) Newfoundland */
|
|
{
|
|
"North Asia East Standard Time", "North Asia East Daylight Time",
|
|
"Asia/Irkutsk"
|
|
}, /* (GMT+08:00) Irkutsk, Ulaan Bataar */
|
|
{
|
|
"North Asia Standard Time", "North Asia Daylight Time",
|
|
"Asia/Krasnoyarsk"
|
|
}, /* (GMT+07:00) Krasnoyarsk */
|
|
{
|
|
"Pacific SA Standard Time", "Pacific SA Daylight Time",
|
|
"America/Santiago"
|
|
}, /* (GMT-04:00) Santiago */
|
|
{
|
|
"Pacific Standard Time", "Pacific Daylight Time",
|
|
"US/Pacific"
|
|
}, /* (GMT-08:00) Pacific Time (US & Canada);
|
|
* Tijuana */
|
|
{
|
|
"Pacific Standard Time (Mexico)", "Pacific Daylight Time (Mexico)",
|
|
"America/Tijuana"
|
|
}, /* (GMT-08:00) Tijuana, Baja California */
|
|
{
|
|
"Pakistan Standard Time", "Pakistan Daylight Time",
|
|
"Asia/Karachi"
|
|
}, /* (GMT+05:00) Islamabad, Karachi */
|
|
{
|
|
"Paraguay Standard Time", "Paraguay Daylight Time",
|
|
"America/Asuncion"
|
|
}, /* (GMT-04:00) Asuncion */
|
|
{
|
|
"Romance Standard Time", "Romance Daylight Time",
|
|
"Europe/Brussels"
|
|
}, /* (GMT+01:00) Brussels, Copenhagen, Madrid,
|
|
* Paris */
|
|
{
|
|
"Russian Standard Time", "Russian Daylight Time",
|
|
"Europe/Moscow"
|
|
}, /* (GMT+03:00) Moscow, St. Petersburg,
|
|
* Volgograd */
|
|
{
|
|
"SA Eastern Standard Time", "SA Eastern Daylight Time",
|
|
"America/Buenos_Aires"
|
|
}, /* (GMT-03:00) Buenos Aires, Georgetown */
|
|
{
|
|
"SA Pacific Standard Time", "SA Pacific Daylight Time",
|
|
"America/Bogota"
|
|
}, /* (GMT-05:00) Bogota, Lima, Quito */
|
|
{
|
|
"SA Western Standard Time", "SA Western Daylight Time",
|
|
"America/Caracas"
|
|
}, /* (GMT-04:00) Caracas, La Paz */
|
|
{
|
|
"Samoa Standard Time", "Samoa Daylight Time",
|
|
"Pacific/Midway"
|
|
}, /* (GMT-11:00) Midway Island, Samoa */
|
|
{
|
|
"SE Asia Standard Time", "SE Asia Daylight Time",
|
|
"Asia/Bangkok"
|
|
}, /* (GMT+07:00) Bangkok, Hanoi, Jakarta */
|
|
{
|
|
"Malay Peninsula Standard Time", "Malay Peninsula Daylight Time",
|
|
"Asia/Kuala_Lumpur"
|
|
}, /* (GMT+08:00) Kuala Lumpur, Singapore */
|
|
{
|
|
"South Africa Standard Time", "South Africa Daylight Time",
|
|
"Africa/Harare"
|
|
}, /* (GMT+02:00) Harare, Pretoria */
|
|
{
|
|
"Sri Lanka Standard Time", "Sri Lanka Daylight Time",
|
|
"Asia/Colombo"
|
|
}, /* (GMT+06:00) Sri Jayawardenepura */
|
|
{
|
|
"Taipei Standard Time", "Taipei Daylight Time",
|
|
"Asia/Taipei"
|
|
}, /* (GMT+08:00) Taipei */
|
|
{
|
|
"Tasmania Standard Time", "Tasmania Daylight Time",
|
|
"Australia/Hobart"
|
|
}, /* (GMT+10:00) Hobart */
|
|
{
|
|
"Tokyo Standard Time", "Tokyo Daylight Time",
|
|
"Asia/Tokyo"
|
|
}, /* (GMT+09:00) Osaka, Sapporo, Tokyo */
|
|
{
|
|
"Tonga Standard Time", "Tonga Daylight Time",
|
|
"Pacific/Tongatapu"
|
|
}, /* (GMT+13:00) Nuku'alofa */
|
|
{
|
|
"Ulaanbaatar Standard Time", "Ulaanbaatar Daylight Time",
|
|
"Asia/Ulaanbaatar",
|
|
}, /* (GMT+08:00) Ulaanbaatar */
|
|
{
|
|
"US Eastern Standard Time", "US Eastern Daylight Time",
|
|
"US/Eastern"
|
|
}, /* (GMT-05:00) Indiana (East) */
|
|
{
|
|
"US Mountain Standard Time", "US Mountain Daylight Time",
|
|
"US/Arizona"
|
|
}, /* (GMT-07:00) Arizona */
|
|
{
|
|
"Coordinated Universal Time", "Coordinated Universal Time",
|
|
"UTC"
|
|
}, /* (GMT) Coordinated Universal Time */
|
|
{
|
|
"UTC+12", "UTC+12",
|
|
"Etc/GMT+12"
|
|
}, /* (GMT+12:00) Coordinated Universal Time+12 */
|
|
{
|
|
"UTC-02", "UTC-02",
|
|
"Etc/GMT-02"
|
|
}, /* (GMT-02:00) Coordinated Universal Time-02 */
|
|
{
|
|
"UTC-11", "UTC-11",
|
|
"Etc/GMT-11"
|
|
}, /* (GMT-11:00) Coordinated Universal Time-11 */
|
|
{
|
|
"Venezuela Standard Time", "Venezuela Daylight Time",
|
|
"America/Caracas",
|
|
}, /* (GMT-04:30) Caracas */
|
|
{
|
|
"Vladivostok Standard Time", "Vladivostok Daylight Time",
|
|
"Asia/Vladivostok"
|
|
}, /* (GMT+10:00) Vladivostok */
|
|
{
|
|
"W. Australia Standard Time", "W. Australia Daylight Time",
|
|
"Australia/Perth"
|
|
}, /* (GMT+08:00) Perth */
|
|
#ifdef NOT_USED
|
|
/* Could not find a match for this one (just a guess). Excluded for now. */
|
|
{
|
|
"W. Central Africa Standard Time", "W. Central Africa Daylight Time",
|
|
"WAT"
|
|
}, /* (GMT+01:00) West Central Africa */
|
|
#endif
|
|
{
|
|
"W. Europe Standard Time", "W. Europe Daylight Time",
|
|
"CET"
|
|
}, /* (GMT+01:00) Amsterdam, Berlin, Bern, Rome,
|
|
* Stockholm, Vienna */
|
|
{
|
|
"West Asia Standard Time", "West Asia Daylight Time",
|
|
"Asia/Karachi"
|
|
}, /* (GMT+05:00) Islamabad, Karachi, Tashkent */
|
|
{
|
|
"West Pacific Standard Time", "West Pacific Daylight Time",
|
|
"Pacific/Guam"
|
|
}, /* (GMT+10:00) Guam, Port Moresby */
|
|
{
|
|
"Yakutsk Standard Time", "Yakutsk Daylight Time",
|
|
"Asia/Yakutsk"
|
|
}, /* (GMT+09:00) Yakutsk */
|
|
{
|
|
NULL, NULL, NULL
|
|
}
|
|
};
|
|
|
|
static const char *
|
|
identify_system_timezone(void)
|
|
{
|
|
int i;
|
|
char tzname[128];
|
|
char localtzname[256];
|
|
time_t t = time(NULL);
|
|
struct tm *tm = localtime(&t);
|
|
HKEY rootKey;
|
|
int idx;
|
|
|
|
if (!tm)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg("could not identify system time zone: localtime() failed"),
|
|
errdetail("The PostgreSQL time zone will be set to \"%s\".",
|
|
"GMT"),
|
|
errhint("You can specify the correct timezone in postgresql.conf.")));
|
|
return NULL; /* go to GMT */
|
|
}
|
|
|
|
memset(tzname, 0, sizeof(tzname));
|
|
strftime(tzname, sizeof(tzname) - 1, "%Z", tm);
|
|
|
|
for (i = 0; win32_tzmap[i].stdname != NULL; i++)
|
|
{
|
|
if (strcmp(tzname, win32_tzmap[i].stdname) == 0 ||
|
|
strcmp(tzname, win32_tzmap[i].dstname) == 0)
|
|
{
|
|
elog(DEBUG4, "TZ \"%s\" matches system time zone \"%s\"",
|
|
win32_tzmap[i].pgtzname, tzname);
|
|
return win32_tzmap[i].pgtzname;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Localized Windows versions return localized names for the timezone.
|
|
* Scan the registry to find the English name, and then try matching
|
|
* against our table again.
|
|
*/
|
|
memset(localtzname, 0, sizeof(localtzname));
|
|
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
|
|
"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones",
|
|
0,
|
|
KEY_READ,
|
|
&rootKey) != ERROR_SUCCESS)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg("could not open registry key to identify system time zone: %d",
|
|
(int) GetLastError()),
|
|
errdetail("The PostgreSQL time zone will be set to \"%s\".",
|
|
"GMT"),
|
|
errhint("You can specify the correct timezone in postgresql.conf.")));
|
|
return NULL; /* go to GMT */
|
|
}
|
|
|
|
for (idx = 0;; idx++)
|
|
{
|
|
char keyname[256];
|
|
char zonename[256];
|
|
DWORD namesize;
|
|
FILETIME lastwrite;
|
|
HKEY key;
|
|
LONG r;
|
|
|
|
memset(keyname, 0, sizeof(keyname));
|
|
namesize = sizeof(keyname);
|
|
if ((r = RegEnumKeyEx(rootKey,
|
|
idx,
|
|
keyname,
|
|
&namesize,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
&lastwrite)) != ERROR_SUCCESS)
|
|
{
|
|
if (r == ERROR_NO_MORE_ITEMS)
|
|
break;
|
|
ereport(LOG,
|
|
(errmsg_internal("could not enumerate registry subkeys to identify system time zone: %d", (int) r)));
|
|
break;
|
|
}
|
|
|
|
if ((r = RegOpenKeyEx(rootKey, keyname, 0, KEY_READ, &key)) != ERROR_SUCCESS)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg_internal("could not open registry subkey to identify system time zone: %d", (int) r)));
|
|
break;
|
|
}
|
|
|
|
memset(zonename, 0, sizeof(zonename));
|
|
namesize = sizeof(zonename);
|
|
if ((r = RegQueryValueEx(key, "Std", NULL, NULL, (unsigned char *) zonename, &namesize)) != ERROR_SUCCESS)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg_internal("could not query value for key \"std\" to identify system time zone \"%s\": %d",
|
|
keyname, (int) r)));
|
|
RegCloseKey(key);
|
|
continue; /* Proceed to look at the next timezone */
|
|
}
|
|
if (strcmp(tzname, zonename) == 0)
|
|
{
|
|
/* Matched zone */
|
|
strcpy(localtzname, keyname);
|
|
RegCloseKey(key);
|
|
break;
|
|
}
|
|
memset(zonename, 0, sizeof(zonename));
|
|
namesize = sizeof(zonename);
|
|
if ((r = RegQueryValueEx(key, "Dlt", NULL, NULL, (unsigned char *) zonename, &namesize)) != ERROR_SUCCESS)
|
|
{
|
|
ereport(LOG,
|
|
(errmsg_internal("could not query value for key \"dlt\" to identify system time zone \"%s\": %d",
|
|
keyname, (int) r)));
|
|
RegCloseKey(key);
|
|
continue; /* Proceed to look at the next timezone */
|
|
}
|
|
if (strcmp(tzname, zonename) == 0)
|
|
{
|
|
/* Matched DST zone */
|
|
strcpy(localtzname, keyname);
|
|
RegCloseKey(key);
|
|
break;
|
|
}
|
|
|
|
RegCloseKey(key);
|
|
}
|
|
|
|
RegCloseKey(rootKey);
|
|
|
|
if (localtzname[0])
|
|
{
|
|
/* Found a localized name, so scan for that one too */
|
|
for (i = 0; win32_tzmap[i].stdname != NULL; i++)
|
|
{
|
|
if (strcmp(localtzname, win32_tzmap[i].stdname) == 0 ||
|
|
strcmp(localtzname, win32_tzmap[i].dstname) == 0)
|
|
{
|
|
elog(DEBUG4, "TZ \"%s\" matches localized system time zone \"%s\" (\"%s\")",
|
|
win32_tzmap[i].pgtzname, tzname, localtzname);
|
|
return win32_tzmap[i].pgtzname;
|
|
}
|
|
}
|
|
}
|
|
|
|
ereport(LOG,
|
|
(errmsg("could not find a match for system time zone \"%s\"",
|
|
tzname),
|
|
errdetail("The PostgreSQL time zone will be set to \"%s\".",
|
|
"GMT"),
|
|
errhint("You can specify the correct timezone in postgresql.conf.")));
|
|
return NULL; /* go to GMT */
|
|
}
|
|
#endif /* WIN32 */
|
|
|
|
|
|
|
|
/*
|
|
* We keep loaded timezones in a hashtable so we don't have to
|
|
* load and parse the TZ definition file every time one is selected.
|
|
* Because we want timezone names to be found case-insensitively,
|
|
* the hash key is the uppercased name of the zone.
|
|
*/
|
|
typedef struct
|
|
{
|
|
/* tznameupper contains the all-upper-case name of the timezone */
|
|
char tznameupper[TZ_STRLEN_MAX + 1];
|
|
pg_tz tz;
|
|
} pg_tz_cache;
|
|
|
|
static HTAB *timezone_cache = NULL;
|
|
|
|
|
|
static bool
|
|
init_timezone_hashtable(void)
|
|
{
|
|
HASHCTL hash_ctl;
|
|
|
|
MemSet(&hash_ctl, 0, sizeof(hash_ctl));
|
|
|
|
hash_ctl.keysize = TZ_STRLEN_MAX + 1;
|
|
hash_ctl.entrysize = sizeof(pg_tz_cache);
|
|
|
|
timezone_cache = hash_create("Timezones",
|
|
4,
|
|
&hash_ctl,
|
|
HASH_ELEM);
|
|
if (!timezone_cache)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Load a timezone from file or from cache.
|
|
* Does not verify that the timezone is acceptable!
|
|
*/
|
|
struct pg_tz *
|
|
pg_tzset(const char *name)
|
|
{
|
|
pg_tz_cache *tzp;
|
|
struct state tzstate;
|
|
char uppername[TZ_STRLEN_MAX + 1];
|
|
char canonname[TZ_STRLEN_MAX + 1];
|
|
char *p;
|
|
|
|
if (strlen(name) > TZ_STRLEN_MAX)
|
|
return NULL; /* not going to fit */
|
|
|
|
if (!timezone_cache)
|
|
if (!init_timezone_hashtable())
|
|
return NULL;
|
|
|
|
/*
|
|
* Upcase the given name to perform a case-insensitive hashtable search.
|
|
* (We could alternatively downcase it, but we prefer upcase so that we
|
|
* can get consistently upcased results from tzparse() in case the name is
|
|
* a POSIX-style timezone spec.)
|
|
*/
|
|
p = uppername;
|
|
while (*name)
|
|
*p++ = pg_toupper((unsigned char) *name++);
|
|
*p = '\0';
|
|
|
|
tzp = (pg_tz_cache *) hash_search(timezone_cache,
|
|
uppername,
|
|
HASH_FIND,
|
|
NULL);
|
|
if (tzp)
|
|
{
|
|
/* Timezone found in cache, nothing more to do */
|
|
return &tzp->tz;
|
|
}
|
|
|
|
if (tzload(uppername, canonname, &tzstate, TRUE) != 0)
|
|
{
|
|
if (uppername[0] == ':' || tzparse(uppername, &tzstate, FALSE) != 0)
|
|
{
|
|
/* Unknown timezone. Fail our call instead of loading GMT! */
|
|
return NULL;
|
|
}
|
|
/* For POSIX timezone specs, use uppercase name as canonical */
|
|
strcpy(canonname, uppername);
|
|
}
|
|
|
|
/* Save timezone in the cache */
|
|
tzp = (pg_tz_cache *) hash_search(timezone_cache,
|
|
uppername,
|
|
HASH_ENTER,
|
|
NULL);
|
|
|
|
/* hash_search already copied uppername into the hash key */
|
|
strcpy(tzp->tz.TZname, canonname);
|
|
memcpy(&tzp->tz.state, &tzstate, sizeof(tzstate));
|
|
|
|
return &tzp->tz;
|
|
}
|
|
|
|
|
|
/*
|
|
* Check whether timezone is acceptable.
|
|
*
|
|
* What we are doing here is checking for leap-second-aware timekeeping.
|
|
* We need to reject such TZ settings because they'll wreak havoc with our
|
|
* date/time arithmetic.
|
|
*
|
|
* NB: this must NOT ereport(ERROR). The caller must get control back so that
|
|
* it can restore the old value of TZ if we don't like the new one.
|
|
*/
|
|
bool
|
|
tz_acceptable(pg_tz *tz)
|
|
{
|
|
struct pg_tm *tt;
|
|
pg_time_t time2000;
|
|
|
|
/*
|
|
* To detect leap-second timekeeping, run pg_localtime for what should be
|
|
* GMT midnight, 2000-01-01. Insist that the tm_sec value be zero; any
|
|
* other result has to be due to leap seconds.
|
|
*/
|
|
time2000 = (POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY;
|
|
tt = pg_localtime(&time2000, tz);
|
|
if (!tt || tt->tm_sec != 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get a pg_tz struct for the given timezone name. Returns NULL if name
|
|
* is invalid or not an "acceptable" zone.
|
|
*/
|
|
static pg_tz *
|
|
get_pg_tz_for_zone(const char *tzname)
|
|
{
|
|
pg_tz *tz;
|
|
|
|
if (!tzname || !tzname[0])
|
|
return NULL;
|
|
|
|
tz = pg_tzset(tzname);
|
|
if (!tz)
|
|
return NULL;
|
|
|
|
if (!tz_acceptable(tz))
|
|
return NULL;
|
|
|
|
return tz;
|
|
}
|
|
|
|
/*
|
|
* 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 */
|
|
}
|
|
|
|
|
|
/*
|
|
* Pre-initialize timezone library
|
|
*
|
|
* This is called before GUC variable initialization begins. Its purpose
|
|
* is to ensure that elog.c has a pgtz variable available to format timestamps
|
|
* with, in case log_line_prefix is set to a value requiring that. We cannot
|
|
* set log_timezone yet.
|
|
*/
|
|
void
|
|
pg_timezone_pre_initialize(void)
|
|
{
|
|
/*
|
|
* We can't use tzload() because we may not know where PGSHAREDIR is (in
|
|
* particular this is true in an EXEC_BACKEND subprocess). Since this
|
|
* timezone variable will only be used for emergency fallback purposes, it
|
|
* seems OK to just use the "lastditch" case provided by tzparse().
|
|
*/
|
|
if (tzparse("GMT", &gmt_timezone_data.state, TRUE) != 0)
|
|
elog(FATAL, "could not initialize GMT time zone");
|
|
strcpy(gmt_timezone_data.TZname, "GMT");
|
|
gmt_timezone = &gmt_timezone_data;
|
|
}
|
|
|
|
/*
|
|
* Initialize timezone library
|
|
*
|
|
* This is called after initial loading of postgresql.conf. If no TimeZone
|
|
* setting was found therein, we try to derive one from the environment.
|
|
* Likewise for log_timezone.
|
|
*
|
|
* Note: this is also called from ProcessConfigFile, to re-establish valid
|
|
* GUC settings if the GUCs have been reset to default following their
|
|
* removal from postgresql.conf.
|
|
*/
|
|
void
|
|
pg_timezone_initialize(void)
|
|
{
|
|
pg_tz *def_tz = NULL;
|
|
|
|
/*
|
|
* Make sure that session_timezone and log_timezone are set.
|
|
* (session_timezone could still be NULL even if a timezone value was set
|
|
* in postgresql.conf, if that setting was interval-based rather than
|
|
* timezone-based.)
|
|
*/
|
|
if (!session_timezone)
|
|
{
|
|
def_tz = select_default_timezone();
|
|
session_timezone = def_tz;
|
|
}
|
|
if (!log_timezone)
|
|
{
|
|
/* Don't duplicate work */
|
|
if (!def_tz)
|
|
def_tz = select_default_timezone();
|
|
log_timezone = def_tz;
|
|
}
|
|
|
|
/*
|
|
* Now, set the timezone and log_timezone GUCs if they're still default.
|
|
* (This will redundantly call pg_tzset().)
|
|
*
|
|
* We choose to label these values PGC_S_ENV_VAR, rather than
|
|
* PGC_S_DYNAMIC_DEFAULT which would be functionally equivalent, because
|
|
* they came either from getenv("TZ") or from libc behavior that's
|
|
* determined by process environment of some kind.
|
|
*
|
|
* Note: in the case where a setting has just been removed from
|
|
* postgresql.conf, this code will not do what you might expect, namely
|
|
* call select_default_timezone() and install that value as the setting.
|
|
* Rather, the previously active setting --- typically the one from
|
|
* postgresql.conf --- will be reinstalled, relabeled as PGC_S_ENV_VAR. If
|
|
* we did try to install the "correct" default value, the effect would be
|
|
* that each postmaster child would independently run an extremely
|
|
* expensive search of the timezone database, bringing the database to its
|
|
* knees for possibly multiple seconds. This is so unpleasant, and could
|
|
* so easily be triggered quite unintentionally, that it seems better to
|
|
* violate the principle of least astonishment.
|
|
*/
|
|
if (GetConfigOptionResetString("timezone") == NULL)
|
|
SetConfigOption("timezone", pg_get_timezone_name(session_timezone),
|
|
PGC_POSTMASTER, PGC_S_ENV_VAR);
|
|
|
|
if (GetConfigOptionResetString("log_timezone") == NULL)
|
|
SetConfigOption("log_timezone", pg_get_timezone_name(log_timezone),
|
|
PGC_POSTMASTER, PGC_S_ENV_VAR);
|
|
}
|
|
|
|
|
|
/*
|
|
* Functions to enumerate available timezones
|
|
*
|
|
* Note that pg_tzenumerate_next() will return a pointer into the pg_tzenum
|
|
* structure, so the data is only valid up to the next call.
|
|
*
|
|
* All data is allocated using palloc in the current context.
|
|
*/
|
|
#define MAX_TZDIR_DEPTH 10
|
|
|
|
struct pg_tzenum
|
|
{
|
|
int baselen;
|
|
int depth;
|
|
DIR *dirdesc[MAX_TZDIR_DEPTH];
|
|
char *dirname[MAX_TZDIR_DEPTH];
|
|
struct pg_tz tz;
|
|
};
|
|
|
|
/* typedef pg_tzenum is declared in pgtime.h */
|
|
|
|
pg_tzenum *
|
|
pg_tzenumerate_start(void)
|
|
{
|
|
pg_tzenum *ret = (pg_tzenum *) palloc0(sizeof(pg_tzenum));
|
|
char *startdir = pstrdup(pg_TZDIR());
|
|
|
|
ret->baselen = strlen(startdir) + 1;
|
|
ret->depth = 0;
|
|
ret->dirname[0] = startdir;
|
|
ret->dirdesc[0] = AllocateDir(startdir);
|
|
if (!ret->dirdesc[0])
|
|
ereport(ERROR,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open directory \"%s\": %m", startdir)));
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
pg_tzenumerate_end(pg_tzenum *dir)
|
|
{
|
|
while (dir->depth >= 0)
|
|
{
|
|
FreeDir(dir->dirdesc[dir->depth]);
|
|
pfree(dir->dirname[dir->depth]);
|
|
dir->depth--;
|
|
}
|
|
pfree(dir);
|
|
}
|
|
|
|
pg_tz *
|
|
pg_tzenumerate_next(pg_tzenum *dir)
|
|
{
|
|
while (dir->depth >= 0)
|
|
{
|
|
struct dirent *direntry;
|
|
char fullname[MAXPGPATH];
|
|
struct stat statbuf;
|
|
|
|
direntry = ReadDir(dir->dirdesc[dir->depth], dir->dirname[dir->depth]);
|
|
|
|
if (!direntry)
|
|
{
|
|
/* End of this directory */
|
|
FreeDir(dir->dirdesc[dir->depth]);
|
|
pfree(dir->dirname[dir->depth]);
|
|
dir->depth--;
|
|
continue;
|
|
}
|
|
|
|
if (direntry->d_name[0] == '.')
|
|
continue;
|
|
|
|
snprintf(fullname, MAXPGPATH, "%s/%s",
|
|
dir->dirname[dir->depth], direntry->d_name);
|
|
if (stat(fullname, &statbuf) != 0)
|
|
ereport(ERROR,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not stat \"%s\": %m", fullname)));
|
|
|
|
if (S_ISDIR(statbuf.st_mode))
|
|
{
|
|
/* Step into the subdirectory */
|
|
if (dir->depth >= MAX_TZDIR_DEPTH - 1)
|
|
ereport(ERROR,
|
|
(errmsg_internal("timezone directory stack overflow")));
|
|
dir->depth++;
|
|
dir->dirname[dir->depth] = pstrdup(fullname);
|
|
dir->dirdesc[dir->depth] = AllocateDir(fullname);
|
|
if (!dir->dirdesc[dir->depth])
|
|
ereport(ERROR,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open directory \"%s\": %m",
|
|
fullname)));
|
|
|
|
/* Start over reading in the new directory */
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Load this timezone using tzload() not pg_tzset(), so we don't fill
|
|
* the cache
|
|
*/
|
|
if (tzload(fullname + dir->baselen, dir->tz.TZname, &dir->tz.state,
|
|
TRUE) != 0)
|
|
{
|
|
/* Zone could not be loaded, ignore it */
|
|
continue;
|
|
}
|
|
|
|
if (!tz_acceptable(&dir->tz))
|
|
{
|
|
/* Ignore leap-second zones */
|
|
continue;
|
|
}
|
|
|
|
/* Timezone loaded OK. */
|
|
return &dir->tz;
|
|
}
|
|
|
|
/* Nothing more found */
|
|
return NULL;
|
|
}
|