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Fix system time sampling on MS-Windows

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* 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.
This commit is contained in:
Eli Zaretskii 2023-03-24 14:10:30 +03:00
parent 33d436eefa
commit accb387166
1 changed files with 9 additions and 0 deletions
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9
src/timefns.c
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@ -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);