mirror of
https://github.com/jart/cosmopolitan.git
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82 lines
4 KiB
C
82 lines
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 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/calls/asan.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/state.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/errfuns.h"
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/**
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* Sleeps for a particular amount of time.
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*
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* @param req is the duration of time we should sleep
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* @param rem if non-NULL will receive the amount of time that wasn't
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* slept because a signal was delivered. If no signal's delivered
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* then this value will be set to `{0, 0}`. It's also fine to set
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* this value to the same pointer as `req`.
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* @return 0 on success, or -1 w/ errno
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* @raise EINVAL if `req->tv_nsec ∉ [0,1000000000)`
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* @raise EINTR if a signal was delivered, and `rem` is updated
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* @raise EFAULT if `req` is NULL or `req` / `rem` is a bad pointer
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* @raise ENOSYS on bare metal
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* @note POSIX.1 specifies nanosleep() measures against `CLOCK_REALTIME`
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* however Linux measures uses `CLOCK_MONOTONIC`. This shouldn't
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* matter, since POSIX.1 further specifies that discontinuous
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* changes in `CLOCK_REALTIME` shouldn't impact nanosleep()
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* @norestart
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*/
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int nanosleep(const struct timespec *req, struct timespec *rem) {
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int rc;
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if (!req || (IsAsan() && (!__asan_is_valid_timespec(req) ||
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(rem && !__asan_is_valid_timespec(rem))))) {
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rc = efault();
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} else if (req->tv_sec < 0 ||
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!(0 <= req->tv_nsec && req->tv_nsec <= 999999999)) {
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rc = einval();
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} else if (!IsWindows() && !IsMetal() && !IsXnu()) {
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rc = sys_nanosleep(req, rem);
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} else if (IsXnu()) {
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rc = sys_nanosleep_xnu(req, rem);
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} else if (IsMetal()) {
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rc = enosys(); /* TODO: Sleep on Metal */
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} else {
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rc = sys_nanosleep_nt(req, rem);
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}
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// Linux Kernel doesn't change the remainder value on success, but
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// some kernels like OpenBSD will. POSIX doesn't specify the Linux
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// behavior. So we polyfill it here.
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if (!rc && rem) {
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rem->tv_sec = 0;
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rem->tv_nsec = 0;
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}
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#if defined(SYSDEBUG) && _POLLTRACE
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if (!__time_critical) {
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POLLTRACE("nanosleep(%s, [%s]) → %d% m", DescribeTimespec(rc, req),
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DescribeTimespec(rc, rem), rc);
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}
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#endif
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return rc;
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}
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