text: /*	$NetBSD: signals.h,v 1.1.1.1 2016/01/14 00:11:29 christos Exp $	*/
  
  /* signals.h -- header to include system dependent signal definitions.
     Id: signals.h,v 1.2 2004/04/11 17:56:46 karl Exp 
  
     Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  
     Originally written by Brian Fox (bfox@ai.mit.edu). */
  
  #ifndef INFO_SIGNALS_H
  #define INFO_SIGNALS_H
  
  #include <sys/types.h>
  #include <signal.h>
  
  /* For sysV68 --phdm@info.ucl.ac.be.  */
  #if !defined (SIGCHLD) && defined (SIGCLD)
  #define SIGCHLD SIGCLD
  #endif
  
  #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
  #  define sigmask(x) (1 << ((x)-1))
  #endif /* !HAVE_SIGPROCMASK && !sigmask */
  
  /* Without SA_NOCLDSTOP, sigset_t might end up being undefined even
     though we have sigprocmask, on older systems, according to Nelson
     Beebe.  The test is from coreutils/sort.c, via Paul Eggert.  */
  #if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP)
  #  if !defined (SIG_BLOCK)
  #    define SIG_UNBLOCK 1
  #    define SIG_BLOCK   2
  #    define SIG_SETMASK 3
  #  endif /* SIG_BLOCK */
  
  /* Type of a signal set. */
  #  define sigset_t int
  
  /* Make SET have no signals in it. */
  #  define sigemptyset(set) (*(set) = (sigset_t)0x0)
  
  /* Make SET have the full range of signal specifications possible. */
  #  define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
  
  /* Add SIG to the contents of SET. */
  #  define sigaddset(set, sig) *(set) |= sigmask (sig)
  
  /* Delete SIG from the contents of SET. */
  #  define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
  
  /* Tell if SET contains SIG. */
  #  define sigismember(set, sig) (*(set) & (sigmask (sig)))
  
  /* Suspend the process until the reception of one of the signals
     not present in SET. */
  #  define sigsuspend(set) sigpause (*(set))
  #endif /* !HAVE_SIGPROCMASK */
  
  #if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
  /* These definitions are used both in POSIX and non-POSIX implementations. */
  
  #define BLOCK_SIGNAL(sig) \
    do { \
      sigset_t nvar, ovar; \
      sigemptyset (&nvar); \
      sigemptyset (&ovar); \
      sigaddset (&nvar, sig); \
      sigprocmask (SIG_BLOCK, &nvar, &ovar); \
    } while (0)
  
  #define UNBLOCK_SIGNAL(sig) \
    do { \
      sigset_t nvar, ovar; \
      sigemptyset (&ovar); \
      sigemptyset (&nvar); \
      sigaddset (&nvar, sig); \
      sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
    } while (0)
  
  #else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  #  define BLOCK_SIGNAL(sig)
  #  define UNBLOCK_SIGNAL(sig)
  #endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
  
  #endif /* not INFO_SIGNALS_H */
  