mirror of
https://github.com/jart/cosmopolitan.git
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046c7ebd4a
- Introduce fast spinlock API - Double rand64() perf w/ spinlock - Improve raise() on New Technology - Support gettid() across platforms - Implement SA_NODEFER on New Technology - Move the lock intrinsics into LIBC_INTRIN - Make SIGTRAP recoverable on New Technology - Block SIGCHLD in wait4() on New Technology - Add threading prototypes for XNU and FreeBSD - Rewrite abort() fixing its minor bugs on XNU/NT - Shave down a lot of the content in libc/bits/bits.h - Let signal handlers modify CPU registers on New Technology
40 lines
2.4 KiB
C
40 lines
2.4 KiB
C
/*-*- mode:c; indent-tabs-mode:nil; tab-width:2; 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/calls.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/sysv/consts/sa.h"
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/**
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* Installs kernel interrupt handler, e.g.
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*
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* void GotCtrlC(int sig) { ... }
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* CHECK_NE(SIG_ERR, signal(SIGINT, GotCtrlC));
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*
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* @return old signal handler on success or SIG_ERR w/ errno
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* @note this function has BSD semantics, i.e. SA_RESTART
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* @see sigaction() which has more features
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*/
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sighandler_t(signal)(int sig, sighandler_t func) {
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struct sigaction old, sa = {.sa_handler = func, .sa_flags = SA_RESTART};
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if ((sigaction)(sig, &sa, &old) != -1) {
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return old.sa_handler;
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} else {
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return SIG_ERR;
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}
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}
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