34 lines
2.3 KiB
C
34 lines
2.3 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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.
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*
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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 sa_old, sa = {.sa_handler = func, .sa_flags = SA_RESTART};
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if ((sigaction)(sig, &sa, &sa_old) == -1) return SIG_ERR;
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return sa_old.sa_handler;
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}
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