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https://github.com/jart/cosmopolitan.git
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12d9e1e128
It now works most excellently across all supported operating sytsems (earlier it didn't work on NT and XNU). Demo code is available in examples/clock.c and this change also adds some of the newer ANSI C time functions like timespec_get(), plus timespec_getres() which hasn't even come out yet as it's C23
69 lines
3.2 KiB
C
69 lines
3.2 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=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 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/calls/asan.internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/timespec.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/sysv/consts/clock.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/time.h"
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static int sys_clock_getres_poly(int clock, struct timespec *ts, int64_t real) {
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if (clock == CLOCK_REALTIME) {
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ts->tv_sec = 0;
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ts->tv_nsec = real;
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return 0;
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} else if (clock == CLOCK_MONOTONIC) {
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ts->tv_sec = 0;
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ts->tv_nsec = 1;
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return 0;
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} else {
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return einval();
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}
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}
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static int sys_clock_getres_nt(int clock, struct timespec *ts) {
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return sys_clock_getres_poly(clock, ts, 100);
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}
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static int sys_clock_getres_xnu(int clock, struct timespec *ts) {
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return sys_clock_getres_poly(clock, ts, 1000);
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}
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/**
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* Returns granularity of clock.
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*/
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int clock_getres(int clock, struct timespec *ts) {
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int rc;
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if (!ts || (IsAsan() && !__asan_is_valid_timespec(ts))) {
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rc = efault();
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} else if (clock == 127) {
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rc = einval(); // 127 is used by consts.sh to mean unsupported
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} else if (IsWindows()) {
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rc = sys_clock_getres_nt(clock, ts);
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} else if (IsXnu()) {
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rc = sys_clock_getres_xnu(clock, ts);
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} else {
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rc = sys_clock_getres(clock, ts);
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}
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STRACE("clock_getres(%s, [%s]) → %d% m", DescribeClockName(clock),
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DescribeTimespec(rc, ts), rc);
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return rc;
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}
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