diff options
Diffstat (limited to 'src/w32.c')
| -rw-r--r-- | src/w32.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/w32.c b/src/w32.c index 8dbf0cf8f19..804d6d0c4bc 100644 --- a/src/w32.c +++ b/src/w32.c @@ -35,6 +35,7 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ #include <mbstring.h> /* for _mbspbrk */ #include <math.h> #include <setjmp.h> +#include <time.h> /* must include CRT headers *before* config.h */ @@ -65,6 +66,8 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ #undef strerror +#undef localtime + #include "lisp.h" #include <pwd.h> @@ -1961,6 +1964,12 @@ gettimeofday (struct timeval *tv, struct timezone *tz) tv->tv_sec = tb.time; tv->tv_usec = tb.millitm * 1000L; + /* Implementation note: _ftime sometimes doesn't update the dstflag + according to the new timezone when the system timezone is + changed. We could fix that by using GetSystemTime and + GetTimeZoneInformation, but that doesn't seem necessary, since + Emacs always calls gettimeofday with the 2nd argument NULL (see + EMACS_GET_TIME). */ if (tz) { tz->tz_minuteswest = tb.timezone; /* minutes west of Greenwich */ @@ -5676,6 +5685,19 @@ sys_write (int fd, const void * buffer, unsigned int count) return nchars; } +/* 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. */ +struct tm * +sys_localtime (const time_t *t) +{ + tzset (); + return localtime (t); +} + static void check_windows_init_file () { |