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/* signals.h -- Header to include system dependent signal definitions.
$Id: signals.h,v 1.3 1997/07/15 18:35:59 karl Exp $
This file is part of GNU Info, a program for reading online documentation
stored in Info format.
Copyright (C) 1993, 94, 95, 97 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.
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 */
#if !defined (HAVE_SIGPROCMASK)
# 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 */
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