hbase

heirloom base
git clone git://git.2f30.org/hbase
Log | Files | Refs | README

sigset.c (1907B)


      1 /*
      2  * Copyright (c) 2004 Gunnar Ritter
      3  *
      4  * This software is provided 'as-is', without any express or implied
      5  * warranty. In no event will the authors be held liable for any damages
      6  * arising from the use of this software.
      7  *
      8  * Permission is granted to anyone to use this software for any purpose,
      9  * including commercial applications, and to alter it and redistribute
     10  * it freely, subject to the following restrictions:
     11  *
     12  * 1. The origin of this software must not be misrepresented; you must not
     13  *    claim that you wrote the original software. If you use this software
     14  *    in a product, an acknowledgment in the product documentation would be
     15  *    appreciated but is not required.
     16  *
     17  * 2. Altered source versions must be plainly marked as such, and must not be
     18  *    misrepresented as being the original software.
     19  *
     20  * 3. This notice may not be removed or altered from any source distribution.
     21  */
     22 /*	Sccsid @(#)sigset.c	1.7 (gritter) 1/22/06	*/
     23 
     24 #if defined (__FreeBSD__) || defined (__dietlibc__) || defined (__NetBSD__) || \
     25 	defined (__OpenBSD__) || defined (__DragonFly__) || defined (__APPLE__)
     26 #include <signal.h>
     27 #include "sigset.h"
     28 
     29 void (*sigset(int sig, void (*func)(int)))(int)
     30 {
     31 	struct sigaction nact, oact;
     32 	sigset_t	nset, oset;
     33 
     34 	if (sig <= 0)
     35 		return SIG_ERR;
     36 	sigemptyset(&nset);
     37 	sigaddset(&nset, sig);
     38 	if (sigprocmask(func==SIG_HOLD?SIG_BLOCK:SIG_UNBLOCK, &nset, &oset) < 0)
     39 		return SIG_ERR;
     40 	nact.sa_handler = func;
     41 	nact.sa_flags = 0;
     42 	if (sig == SIGCHLD && func == SIG_IGN)
     43 		nact.sa_flags |= SA_NOCLDSTOP|SA_NOCLDWAIT;
     44 	sigemptyset(&nact.sa_mask);
     45 	sigaddset(&nact.sa_mask, sig);
     46 	if (sigaction(sig, func==SIG_HOLD?(struct sigaction *)0:&nact, &oact)
     47 			== -1)
     48 		return SIG_ERR;
     49 	if (sigismember(&oset, sig))
     50 		return SIG_HOLD;
     51 	else
     52 		return (oact.sa_handler);
     53 }
     54 #endif	/* __FreeBSD__ || __dietlibc__ || __NetBSD__ || __OpenBSD__ ||
     55 	__DragonFly__ || __APPLE__ */