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https://github.com/jart/cosmopolitan.git
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ccbae7799e
This change also found a few POSIX compliance bugs with errnos. Another bug was discovered where, on Windows, pread() and pwrite() could modify the file position in cases where ReadFile() returned an error e.g. when seeking past the end of file. We also have more tests!
75 lines
3.4 KiB
C
75 lines
3.4 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/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/intrin/strace.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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* @return 0 on success, or -1 w/ errno
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* @error EPERM if pledge() is in play without stdio promise
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* @error EINVAL if `clock` isn't supported on this system
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* @error EFAULT if `ts` points to bad memory
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* @threadsafe
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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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