NetBSD/lib/libc/gen/signal.c

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/* $NetBSD: signal.c,v 1.6 1995/02/27 05:51:17 cgd Exp $ */
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/*
* Copyright (c) 1985, 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)signal.c 8.1 (Berkeley) 6/4/93";
#else
static char rcsid[] = "$NetBSD";
#endif
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#endif /* LIBC_SCCS and not lint */
/*
* Almost backwards compatible signal.
*/
#include <signal.h>
sigset_t __sigintr; /* shared with siginterrupt */
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sig_t
signal(s, a)
int s;
sig_t a;
{
struct sigaction sa, osa;
sa.sa_handler = a;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (!sigismember(&__sigintr, s))
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sa.sa_flags |= SA_RESTART;
if (sigaction(s, &sa, &osa) < 0)
return (SIG_ERR);
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return (osa.sa_handler);
}