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author | Eli Zaretskii <eliz@gnu.org> | 2023-03-24 14:10:30 +0300 |
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committer | Eli Zaretskii <eliz@gnu.org> | 2023-03-24 14:10:30 +0300 |
commit | accb3871668201a1d7b9c54713b94b814c879271 (patch) | |
tree | 4672f312c1ae693eb231a93301ac40c821f4b74d /src | |
parent | 33d436eefa16dfd4cf53bd53fdd764b2896c649c (diff) | |
download | emacs-accb3871668201a1d7b9c54713b94b814c879271.tar.gz |
Fix system time sampling on MS-Windows
* src/timefns.c (emacs_localtime_rz) [WINDOWSNT]: Unconditionally
call tzset to make sure we pick up all the changes of time zone,
working around the MS CRT caching.
Diffstat (limited to 'src')
-rw-r--r-- | src/timefns.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/timefns.c b/src/timefns.c index b3132e7bc34..87971cf4563 100644 --- a/src/timefns.c +++ b/src/timefns.c @@ -180,6 +180,15 @@ static timezone_t const utc_tz = 0; static struct tm * emacs_localtime_rz (timezone_t tz, time_t const *t, struct tm *tm) { +#ifdef WINDOWSNT + /* The Windows CRT functions are "optimized for speed", so they don't + check for timezone and DST changes if they were last called less + than 1 minute ago (see http://support.microsoft.com/kb/821231). + So all Emacs features that repeatedly call time functions (e.g., + display-time) are in real danger of missing timezone and DST + changes. Calling tzset before each localtime call fixes that. */ + tzset (); +#endif tm = localtime_rz (tz, t, tm); if (!tm && errno == ENOMEM) memory_full (SIZE_MAX); |