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| author |   Charles Longeau <github@chl.be> | 2012-10-14 17:12:36 +0200 |
|---|---|---|
| committer | Charles Longeau <github@chl.be> | 2012-10-14 17:12:36 +0200 |
| commit | 2421bbcc7466361d5b827f841749d807e6962204 (patch) | |
| tree | 508e8fde15d14818e51a41277d7e00866d452068 /openbsd-compat | |
| parent | s/clockid_t/int/ to make it build on Mac OS X (diff) | |
| download | OpenSMTPD-2421bbcc7466361d5b827f841749d807e6962204.tar.xz OpenSMTPD-2421bbcc7466361d5b827f841749d807e6962204.zip | |
for Mac OS X: make clock_gettime(CLOCK_MONOTONIC, ...) be more accurate, by using internal Mach calls, instead of gettimeofday()
Diffstat (limited to 'openbsd-compat')
| -rw-r--r-- | openbsd-compat/clock_gettime.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/openbsd-compat/clock_gettime.c b/openbsd-compat/clock_gettime.c index 09305bfc..6c1ef0d4 100644 --- a/openbsd-compat/clock_gettime.c +++ b/openbsd-compat/clock_gettime.c @@ -16,6 +16,9 @@ #include "includes.h" +#ifdef HAVE_MACH_MACH_TIME_H +#include <mach/mach_time.h> +#endif #include <sys/time.h> #include <time.h> @@ -23,11 +26,34 @@ int clock_gettime(int clock_id, struct timespec *tp) { - int ret; - struct timeval tv; + int ret = 0; + uint64_t time; + mach_timebase_info_data_t info; + static double scaling_factor = 0; + +#if 0 + struct timeval tv; ret = gettimeofday(&tv, NULL); TIMEVAL_TO_TIMESPEC(&tv, tp); +#endif + +/* based on http://code-factor.blogspot.fr/2009/11/monotonic-timers.html */ + + time = mach_absolute_time(); + + if (scaling_factor == 0) { + ret = (int) mach_timebase_info(&info); + if (ret != 0) + fatal("mach_timebase_info failed"); + scaling_factor = info.numer/info.denom; + } + + time *= scaling_factor; + + tp->tv_sec = time / 1000000000; + tp->tv_nsec = time % 1000000000; + return (ret); } #endif |