mirror of
https://github.com/jart/cosmopolitan.git
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47 lines
2.3 KiB
C
47 lines
2.3 KiB
C
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/*-*- 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 <signal.h>
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volatile int gotsig;
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void OnSig(int sig) {
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gotsig = sig;
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}
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int main() {
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struct sigaction sa;
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sa.sa_handler = OnSig;
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sa.sa_flags = SA_RESETHAND;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIGUSR1, &sa, 0))
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return 1;
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if (sigaction(SIGUSR1, 0, &sa))
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return 2;
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if (sa.sa_handler != OnSig)
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return 3;
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if (raise(SIGUSR1))
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return 4;
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if (gotsig != SIGUSR1)
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return 5;
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if (sigaction(SIGUSR1, 0, &sa))
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return 6;
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if (sa.sa_handler != SIG_DFL)
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return 7;
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}
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