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sigunblock.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              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

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