1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 8* * 9* A copy of the License is available at * 10* http://www.opensource.org/licenses/cpl1.0.txt * 11* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12* * 13* Information and Software Systems Research * 14* AT&T Research * 15* Florham Park NJ * 16* * 17* Glenn Fowler <gsf@research.att.com> * 18* David Korn <dgk@research.att.com> * 19* Phong Vo <kpv@research.att.com> * 20* * 21***********************************************************************/ 22#pragma prototyped 23 24#include <ast.h> 25 26#if _lib_sigunblock 27 28NoN(sigunblock) 29 30#else 31 32#include <sig.h> 33 34#ifndef SIG_UNBLOCK 35#undef _lib_sigprocmask 36#endif 37 38int 39sigunblock(int s) 40{ 41#if _lib_sigprocmask 42 int op; 43 sigset_t mask; 44 45 sigemptyset(&mask); 46 if (s) 47 { 48 sigaddset(&mask, s); 49 op = SIG_UNBLOCK; 50 } 51 else op = SIG_SETMASK; 52 return(sigprocmask(op, &mask, NiL)); 53#else 54#if _lib_sigsetmask 55 return(sigsetmask(s ? (sigsetmask(0L) & ~sigmask(s)) : 0L)); 56#else 57 NoP(s); 58 return(0); 59#endif 60#endif 61} 62 63#endif 64