/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <ast.h>
#if _lib_sigunblock
NoN(sigunblock)
#else
#include <sig.h>
#ifndef SIG_UNBLOCK
#undef _lib_sigprocmask
#endif
int
sigunblock(int s)
{
#if _lib_sigprocmask
int op;
sigset_t mask;
sigemptyset(&mask);
if (s)
{
sigaddset(&mask, s);
op = SIG_UNBLOCK;
}
else op = SIG_SETMASK;
return(sigprocmask(op, &mask, NiL));
#else
#if _lib_sigsetmask
return(sigsetmask(s ? (sigsetmask(0L) & ~sigmask(s)) : 0L));
#else
NoP(s);
return(0);
#endif
#endif
}
#endif