mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-06 11:18:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Introduce sigtimedwait() and sigwaitinfo()

Browse source 
This change also invents sigcountset() and strsignal_r() and improves
the quality of siginfo_t handling.
This commit is contained in:
Justine Tunney 2022-10-10 07:36:07 -07:00
parent 7ae556463a
commit 467a332e38
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
41 changed files with 887 additions and 345 deletions
Download patch file Download diff file Expand all files Collapse all files

75
libc/calls/sigtimedwait.c Normal file
View file

@ -0,0 +1,75 @@
/*-*- 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. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/asan.internal.h"
#include "libc/calls/sigtimedwait.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 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
*/
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};
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();
}
STRACE("sigtimedwait(%s, [%s], %s) → %s% m", DescribeSigset(0, set),
DescribeSiginfo(rc, info), DescribeTimespec(0, timeout),
strsignal_r(rc, strsig));
return rc;
}