mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
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/intrin/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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