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57 lines
3 KiB
C
57 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 2023 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.internal.h"
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#include "libc/dce.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/thread/tls.h"
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// since there's so many c library interfaces and system call wrappers
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// that always need to block signals we avoid the distraction of their
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// ftrace and strace output being muddied with sigprocmask lines. it's
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// usually better that sigprocmask only strace the user is calling it.
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// plus, since we have a very specific use case, this code goes faster
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sigset_t __sig_block(void) {
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if (IsWindows() || IsMetal()) {
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if (__tls_enabled)
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return atomic_exchange_explicit(&__get_tls()->tib_sigmask, -1,
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memory_order_acquire);
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else
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return 0;
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} else {
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sigset_t res, neu = -1;
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sys_sigprocmask(SIG_SETMASK, &neu, &res);
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return res;
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}
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}
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void __sig_unblock(sigset_t m) {
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if (IsWindows() || IsMetal()) {
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if (__tls_enabled) {
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atomic_store_explicit(&__get_tls()->tib_sigmask, m, memory_order_release);
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if (_weaken(__sig_check))
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_weaken(__sig_check)();
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}
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} else {
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sys_sigprocmask(SIG_SETMASK, &m, 0);
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}
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}
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