mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
66 lines
3.3 KiB
C
66 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/struct/timeval.h"
|
|
#include "libc/fmt/conv.h"
|
|
#include "libc/nt/synchronization.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Returns nanosecond time.
|
|
*
|
|
* This is a high-precision timer that supports multiple definitions of
|
|
* time. Among the more popular is CLOCK_MONOTONIC. This function has a
|
|
* zero syscall implementation of that on modern x86.
|
|
*
|
|
* @param clockid can be CLOCK_REALTIME, CLOCK_MONOTONIC, etc. noting
|
|
* that on Linux CLOCK_MONOTONIC is redefined to use the monotonic
|
|
* clock that's actually monotonic lool
|
|
* @param ts is where the result is stored
|
|
* @return 0 on success, or -1 w/ errno
|
|
* @error ENOSYS if clockid isn't available; in which case this function
|
|
* guarantees an ordinary timestamp is still stored to ts; and
|
|
* errno isn't restored to its original value, to detect prec. loss
|
|
* @see strftime(), gettimeofday()
|
|
* @asyncsignalsafe
|
|
*/
|
|
int clock_gettime(int clockid, struct timespec *ts) {
|
|
int rc;
|
|
axdx_t ad;
|
|
struct NtFileTime ft;
|
|
if (!ts) return efault();
|
|
if (!IsWindows()) {
|
|
if ((rc = sys_clock_gettime(clockid, ts)) == -1 && errno == ENOSYS) {
|
|
ad = sys_gettimeofday((struct timeval *)ts, NULL, NULL);
|
|
assert(ad.ax != -1);
|
|
if (SupportsXnu() && ad.ax) {
|
|
ts->tv_sec = ad.ax;
|
|
ts->tv_nsec = ad.dx;
|
|
}
|
|
ts->tv_nsec *= 1000;
|
|
rc = 0;
|
|
}
|
|
return rc;
|
|
} else {
|
|
GetSystemTimeAsFileTime(&ft);
|
|
*ts = FileTimeToTimeSpec(ft);
|
|
return 0;
|
|
}
|
|
}
|