meillo@0: /*
meillo@0:  * Copyright (c) 2004 Gunnar Ritter
meillo@0:  *
meillo@0:  * This software is provided 'as-is', without any express or implied
meillo@0:  * warranty. In no event will the authors be held liable for any damages
meillo@0:  * arising from the use of this software.
meillo@0:  *
meillo@0:  * Permission is granted to anyone to use this software for any purpose,
meillo@0:  * including commercial applications, and to alter it and redistribute
meillo@0:  * it freely, subject to the following restrictions:
meillo@0:  *
meillo@0:  * 1. The origin of this software must not be misrepresented; you must not
meillo@0:  *    claim that you wrote the original software. If you use this software
meillo@0:  *    in a product, an acknowledgment in the product documentation would be
meillo@0:  *    appreciated but is not required.
meillo@0:  *
meillo@0:  * 2. Altered source versions must be plainly marked as such, and must not be
meillo@0:  *    misrepresented as being the original software.
meillo@0:  *
meillo@0:  * 3. This notice may not be removed or altered from any source distribution.
meillo@0:  */
meillo@0: /*	Sccsid @(#)sigset.c	1.7 (gritter) 1/22/06	*/
meillo@0: 
meillo@0: #if defined (__FreeBSD__) || defined (__dietlibc__) || defined (__NetBSD__) || \
meillo@0: 	defined (__OpenBSD__) || defined (__DragonFly__) || defined (__APPLE__)
meillo@0: #include <signal.h>
meillo@0: #include "sigset.h"
meillo@0: 
meillo@0: void (*sigset(int sig, void (*func)(int)))(int)
meillo@0: {
meillo@0: 	struct sigaction nact, oact;
meillo@0: 	sigset_t	nset, oset;
meillo@0: 
meillo@0: 	if (sig <= 0)
meillo@0: 		return SIG_ERR;
meillo@0: 	sigemptyset(&nset);
meillo@0: 	sigaddset(&nset, sig);
meillo@0: 	if (sigprocmask(func==SIG_HOLD?SIG_BLOCK:SIG_UNBLOCK, &nset, &oset) < 0)
meillo@0: 		return SIG_ERR;
meillo@0: 	nact.sa_handler = func;
meillo@0: 	nact.sa_flags = 0;
meillo@0: 	if (sig == SIGCHLD && func == SIG_IGN)
meillo@0: 		nact.sa_flags |= SA_NOCLDSTOP|SA_NOCLDWAIT;
meillo@0: 	sigemptyset(&nact.sa_mask);
meillo@0: 	sigaddset(&nact.sa_mask, sig);
meillo@0: 	if (sigaction(sig, func==SIG_HOLD?(struct sigaction *)0:&nact, &oact)
meillo@0: 			== -1)
meillo@0: 		return SIG_ERR;
meillo@0: 	if (sigismember(&oset, sig))
meillo@0: 		return SIG_HOLD;
meillo@0: 	else
meillo@0: 		return (oact.sa_handler);
meillo@0: }
meillo@0: #endif	/* __FreeBSD__ || __dietlibc__ || __NetBSD__ || __OpenBSD__ ||
meillo@0: 	__DragonFly__ || __APPLE__ */