mirror of
https://github.com/jart/cosmopolitan.git
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88 lines
4.2 KiB
C
88 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/sigtimedwait.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/sigtimedwait.internal.h"
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#include "libc/calls/struct/siginfo.internal.h"
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#include "libc/calls/struct/sigset.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/strace.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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int sys_sigtimedwait_nt(const sigset_t *, siginfo_t *, const struct timespec *);
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/**
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* Waits for signal synchronously, w/ timeout.
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*
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* This function does not change the thread signal mask. Signals that
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* aren't masked, which aren't in `set`, will be handled normally, in
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* which case this function will raise `EINTR`.
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*
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* This function silently ignores attempts to synchronously wait for
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* SIGTHR which is used internally by the POSIX threads implementation.
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*
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* @param set is signals for which we'll be waiting
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* @param opt_info if not null shall receive info about signal
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* @param opt_timeout is relative deadline and null means wait forever
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* @return signal number on success, or -1 w/ errno
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* @raise EINTR if an asynchronous signal was delivered instead
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise EINVAL if nanoseconds parameter was out of range
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* @raise EAGAIN if timeout elapsed
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* @raise ENOSYS on XNU, OpenBSD, and Metal
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* @raise EFAULT if invalid memory was supplied
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* @cancelationpoint
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* @norestart
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*/
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int sigtimedwait(const sigset_t *set, siginfo_t *opt_info,
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const struct timespec *opt_timeout) {
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int rc;
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char strsig[21];
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struct timespec ts;
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union siginfo_meta si = {0};
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BEGIN_CANCELATION_POINT;
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// validate timeout
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if (opt_timeout && opt_timeout->tv_nsec >= 1000000000ull) {
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rc = einval();
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} else if (IsLinux() || IsFreebsd() || IsNetbsd()) {
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if (opt_timeout) {
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// 1. Linux needs its size parameter
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// 2. NetBSD modifies timeout argument
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ts = *opt_timeout;
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rc = sys_sigtimedwait(set, &si, &ts, 8);
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} else {
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rc = sys_sigtimedwait(set, &si, 0, 8);
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}
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if (rc != -1 && opt_info)
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__siginfo2cosmo(opt_info, &si);
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} else if (IsWindows()) {
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rc = sys_sigtimedwait_nt(set, opt_info, opt_timeout);
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} else {
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rc = enosys();
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}
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END_CANCELATION_POINT;
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STRACE("sigtimedwait(%s, [%s], %s) → %s% m", DescribeSigset(0, set),
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DescribeSiginfo(rc, opt_info), DescribeTimespec(0, opt_timeout),
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strsignal_r(rc, strsig));
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return rc;
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}
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