mirror of
https://github.com/jart/cosmopolitan.git
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99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/dce.h"
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#include "libc/fmt/conv.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/nt/synchronization.h"
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#include "libc/sysv/errfuns.h"
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static typeof(sys_clock_gettime) *__clock_gettime = sys_clock_gettime;
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/**
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* Returns nanosecond time.
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*
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* This is a high-precision timer that supports multiple definitions of
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* time. Among the more popular is CLOCK_MONOTONIC. This function has a
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* zero syscall implementation of that on modern x86.
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*
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* @param clockid can be CLOCK_REALTIME, CLOCK_MONOTONIC, etc.
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* @param ts is where the result is stored
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* @return 0 on success, or -1 w/ errno
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* @error EINVAL if clockid isn't supported on this system
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* @see strftime(), gettimeofday()
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* @asyncsignalsafe
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*/
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noinstrument int clock_gettime(int clockid, struct timespec *ts) {
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int rc, e;
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axdx_t ad;
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char buf[45];
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if (!ts) {
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rc = efault();
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} else if (IsAsan() && !__asan_is_valid(ts, sizeof(*ts))) {
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rc = efault();
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} else if (clockid == -1) {
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rc = einval();
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} else if (!IsWindows()) {
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e = errno;
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if ((rc = __clock_gettime(clockid, ts))) {
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errno = e;
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ad = sys_gettimeofday((struct timeval *)ts, NULL, NULL);
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assert(ad.ax != -1);
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if (SupportsXnu() && ad.ax) {
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ts->tv_sec = ad.ax;
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ts->tv_nsec = ad.dx;
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}
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ts->tv_nsec *= 1000;
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rc = 0;
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}
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} else {
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rc = sys_clock_gettime_nt(clockid, ts);
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}
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if (!__time_critical) {
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STRACE("clock_gettime(%d, [%s]) → %d% m", clockid,
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DescribeTimespec(buf, sizeof(buf), rc, ts), rc);
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}
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return rc;
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}
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/**
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* Returns fast system clock_gettime() if it exists.
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*/
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void *__get_clock_gettime(void) {
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// TODO(jart): Re-enable this.
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return 0;
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void *vdso;
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static bool once;
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static void *result;
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if (!once) {
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if ((vdso = __vdsofunc("__vdso_clock_gettime"))) {
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__clock_gettime = result = vdso;
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}
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once = true;
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}
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return result;
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}
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const void *const __clock_gettime_ctor[] initarray = {
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__get_clock_gettime,
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};
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