mirror of
https://github.com/jart/cosmopolitan.git
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66 lines
3.3 KiB
C
66 lines
3.3 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/sig.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/struct/sigset.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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/**
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* Determines the blocked pending signals
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*
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* @param pending is where the bitset of pending signals is returned,
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* which may not be null
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* @return 0 on success, or -1 w/ errno
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* @raise EFAULT if `pending` points to invalid memory
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* @asyncsignalsafe
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*/
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int sigpending(sigset_t *pending) {
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int rc;
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if (!pending || (IsAsan() && !__asan_is_valid(pending, sizeof(*pending)))) {
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rc = efault();
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} else if (IsLinux() || IsNetbsd() || IsOpenbsd() || IsFreebsd() || IsXnu()) {
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// 128 signals on NetBSD and FreeBSD, 64 on Linux, 32 on OpenBSD and XNU
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uint64_t mem[2];
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rc = sys_sigpending(mem, 8);
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if (IsOpenbsd()) {
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*pending = rc;
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} else {
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*pending = mem[0];
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}
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if (IsXnu() || IsOpenbsd()) {
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*pending &= 0xffffffff;
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}
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rc = 0;
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} else if (IsWindows()) {
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*pending = atomic_load_explicit(&__sig.pending, memory_order_acquire) |
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atomic_load_explicit(&__get_tls()->tib_sigpending,
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memory_order_acquire);
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rc = 0;
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} else {
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rc = enosys();
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}
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STRACE("sigpending([%s]) → %d% m", DescribeSigset(rc, pending), rc);
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return rc;
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}
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