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