1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2009 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 28 NoN(sigunblock) 29 30 #else 31 32 #include <sig.h> 33 34 #ifndef SIG_UNBLOCK 35 #undef _lib_sigprocmask 36 #endif 37 38 int 39 sigunblock(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