84 lines
3.9 KiB
C
84 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/bits/bits.h"
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/timespec.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/mach.h"
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#include "libc/nt/struct/filetime.h"
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#include "libc/nt/struct/systemtime.h"
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#include "libc/nt/synchronization.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/time.h"
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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. noting
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* that on Linux CLOCK_MONOTONIC is redefined to use the monotonic
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* clock that's actually monotonic lool
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* @param out_ts is where the nanoseconds are stored if non-NULL
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* @return 0 on success or -1 w/ errno on error
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* @error ENOSYS if clockid isn't available; in which case this function
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* guarantees an ordinary timestamp is still stored to out_ts; and
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* errno isn't restored to its original value, to detect prec. loss
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* @see strftime(), gettimeofday()
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* @asyncsignalsafe
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* @syscall
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*/
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int clock_gettime(int clockid, struct timespec *out_ts) {
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/* TODO(jart): Just ignore O/S for MONOTONIC and measure RDTSC on start */
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if (!IsWindows()) {
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if (!IsXnu()) {
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if (out_ts) {
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out_ts->tv_sec = 0;
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out_ts->tv_nsec = 0;
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}
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return clock_gettime$sysv(clockid, out_ts);
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} else {
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int rc;
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_Static_assert(sizeof(struct timeval) == sizeof(struct timespec));
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if (out_ts) {
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out_ts->tv_sec = 0;
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out_ts->tv_nsec = 0;
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}
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rc = gettimeofday$sysv((struct timeval *)out_ts, NULL);
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if (out_ts) {
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out_ts->tv_nsec *= 1000;
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}
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return rc;
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}
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} else {
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struct NtFileTime ft;
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GetSystemTimeAsFileTime(&ft);
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*out_ts = FileTimeToTimeSpec(ft);
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return 0;
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}
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}
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