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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
66 lines
3 KiB
C
66 lines
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 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/assert.h"
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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/intrin/atomic.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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textwindows int __sig_mask(int how, const sigset_t *neu, sigset_t *old) {
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// validate api usage
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if (how != SIG_BLOCK && how != SIG_UNBLOCK && how != SIG_SETMASK) {
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return einval();
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}
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// get address of sigset to modify
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_Atomic(uint64_t) *mask = &__get_tls()->tib_sigmask;
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// handle read-only case
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sigset_t oldmask;
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if (neu) {
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if (how == SIG_BLOCK) {
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oldmask = atomic_fetch_or_explicit(mask, *neu, memory_order_acq_rel);
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} else if (how == SIG_UNBLOCK) {
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oldmask = atomic_fetch_and_explicit(mask, ~*neu, memory_order_acq_rel);
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} else { // SIG_SETMASK
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oldmask = atomic_exchange_explicit(mask, *neu, memory_order_acq_rel);
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}
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} else {
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oldmask = atomic_load_explicit(mask, memory_order_acquire);
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}
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// return old signal mask to caller
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if (old) {
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*old = oldmask;
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}
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if (_weaken(__sig_check)) {
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_weaken(__sig_check)();
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}
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return 0;
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}
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#endif /* __x86_64__ */
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