56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* BSD-like signal function.
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Copyright (C) 1991,1992,1996,1997,2000,2002,2005
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <string.h> /* For the real memset prototype. */
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sigset_t _sigintr attribute_hidden; /* Set by siginterrupt. */
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/* Set the handler for the signal SIG to HANDLER,
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returning the old handler, or SIG_ERR on error. */
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__sighandler_t
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__bsd_signal (sig, handler)
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int sig;
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__sighandler_t handler;
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{
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struct sigaction act, oact;
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/* Check signal extents to protect __sigismember. */
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if (handler == SIG_ERR || sig < 1 || sig >= NSIG)
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{
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__set_errno (EINVAL);
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return SIG_ERR;
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}
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act.sa_handler = handler;
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if (__sigemptyset (&act.sa_mask) < 0
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|| __sigaddset (&act.sa_mask, sig) < 0)
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return SIG_ERR;
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act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;
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if (__sigaction (sig, &act, &oact) < 0)
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return SIG_ERR;
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return oact.sa_handler;
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}
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weak_alias (__bsd_signal, bsd_signal)
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weak_alias (__bsd_signal, signal)
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weak_alias (__bsd_signal, ssignal)
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