cosmopolitan/libc/calls/sigtimedwait.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2022 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
2023-04-27 03:45:01 +00:00
#include "libc/calls/sigtimedwait.h"
#include "libc/calls/asan.internal.h"
#include "libc/calls/cp.internal.h"
#include "libc/calls/sigtimedwait.internal.h"
#include "libc/calls/struct/siginfo.internal.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
/**
* Waits for signal synchronously, w/ timeout.
*
* @param set is signals for which we'll be waiting
* @param info if not null shall receive info about signal
* @param timeout is relative deadline and null means wait forever
* @return signal number on success, or -1 w/ errno
* @raise EINTR if an asynchronous signal was delivered instead
* @raise ECANCELED if thread was cancelled in masked mode
* @raise EINVAL if nanoseconds parameter was out of range
* @raise EAGAIN if deadline expired
* @raise ENOSYS on Windows, XNU, OpenBSD, Metal
* @raise EFAULT if invalid memory was supplied
* @cancellationpoint
*/
int sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec *timeout) {
int rc;
char strsig[15];
struct timespec ts;
union siginfo_meta si = {0};
BEGIN_CANCELLATION_POINT;
if (IsAsan() && (!__asan_is_valid(set, sizeof(*set)) ||
(info && !__asan_is_valid(info, sizeof(*info))) ||
(timeout && !__asan_is_valid_timespec(timeout)))) {
rc = efault();
} else if (IsLinux() || IsFreebsd() || IsNetbsd()) {
if (timeout) {
// 1. Linux needs its size parameter
// 2. NetBSD modifies timeout argument
ts = *timeout;
rc = sys_sigtimedwait(set, &si, &ts, 8);
} else {
rc = sys_sigtimedwait(set, &si, 0, 8);
}
if (rc != -1 && info) {
__siginfo2cosmo(info, &si);
}
} else {
rc = enosys();
}
END_CANCELLATION_POINT;
STRACE("sigtimedwait(%s, [%s], %s) → %s% m", DescribeSigset(0, set),
DescribeSiginfo(rc, info), DescribeTimespec(0, timeout),
strsignal_r(rc, strsig));
return rc;
}