1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #pragma prototyped 23*4887Schin 24*4887Schin #include <ast.h> 25*4887Schin 26*4887Schin #if _lib_sigunblock 27*4887Schin 28*4887Schin NoN(sigunblock) 29*4887Schin 30*4887Schin #else 31*4887Schin 32*4887Schin #include <sig.h> 33*4887Schin 34*4887Schin #ifndef SIG_UNBLOCK 35*4887Schin #undef _lib_sigprocmask 36*4887Schin #endif 37*4887Schin 38*4887Schin int 39*4887Schin sigunblock(int s) 40*4887Schin { 41*4887Schin #if _lib_sigprocmask 42*4887Schin int op; 43*4887Schin sigset_t mask; 44*4887Schin 45*4887Schin sigemptyset(&mask); 46*4887Schin if (s) 47*4887Schin { 48*4887Schin sigaddset(&mask, s); 49*4887Schin op = SIG_UNBLOCK; 50*4887Schin } 51*4887Schin else op = SIG_SETMASK; 52*4887Schin return(sigprocmask(op, &mask, NiL)); 53*4887Schin #else 54*4887Schin #if _lib_sigsetmask 55*4887Schin return(sigsetmask(s ? (sigsetmask(0L) & ~sigmask(s)) : 0L)); 56*4887Schin #else 57*4887Schin NoP(s); 58*4887Schin return(0); 59*4887Schin #endif 60*4887Schin #endif 61*4887Schin } 62*4887Schin 63*4887Schin #endif 64