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      1 /*	$NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1985, 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)signal.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 /*
     42  * Almost backwards compatible signal.
     43  */
     44 #include "namespace.h"
     45 #include "extern.h"
     46 #include <signal.h>
     47 
     48 #ifdef __weak_alias
     49 __weak_alias(signal,_signal)
     50 #endif
     51 
     52 sigset_t __sigintr;		/* shared with siginterrupt */
     53 
     54 sig_t
     55 signal(int s, sig_t a)
     56 {
     57 	struct sigaction sa, osa;
     58 
     59 	sa.sa_handler = a;
     60 	sigemptyset(&sa.sa_mask);
     61 	sa.sa_flags = 0;
     62 	if (!sigismember(&__sigintr, s))
     63 		sa.sa_flags |= SA_RESTART;
     64 	if (sigaction(s, &sa, &osa) < 0)
     65 		return (SIG_ERR);
     66 	return (osa.sa_handler);
     67 }
     68 
     69 void
     70 (*bsd_signal(int sig, void (*func)(int)))(int)
     71 {
     72 	struct sigaction act, oact;
     73 
     74 	act.sa_handler = func;
     75 	act.sa_flags = SA_RESTART;
     76 
     77 	sigemptyset(&act.sa_mask);
     78 	sigaddset(&act.sa_mask, sig);
     79 	if (sigaction(sig, &act, &oact) < 0)
     80 		return (SIG_ERR);
     81 
     82 	return (oact.sa_handler);
     83 }
     84