path: root/signal/signal.h

/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/*
 *	ISO C Standard: 4.7 SIGNAL HANDLING <signal.h>
 */

#ifndef	_SIGNAL_H

#if !defined __need_sig_atomic_t && !defined __need_sigset_t
# define _SIGNAL_H
#endif

#include <features.h>

__BEGIN_DECLS

#include <bits/sigset.h>		/* __sigset_t, __sig_atomic_t.  */

/* An integral type that can be modified atomically, without the
   possibility of a signal arriving in the middle of the operation.  */
#ifndef __sig_atomic_t_defined
# if defined __need_sig_atomic_t || defined _SIGNAL_H
#  undef __need_sig_atomic_t
#  define __sig_atomic_t_defined
typedef __sig_atomic_t sig_atomic_t;
# endif
#endif

#ifndef __sigset_t_defined
# if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
#  undef __need_sigset_t
#  define __sigset_t_defined
typedef __sigset_t sigset_t;
# endif
#endif

#ifdef _SIGNAL_H

#include <bits/types.h>
#include <bits/signum.h>

#ifdef __USE_XOPEN
# ifndef __pid_t_defined
typedef __pid_t pid_t;
#  define __pid_t_defined
# endif
# ifndef __uid_t_defined
typedef __uid_t uid_t;
#  define __uid_t_defined
# endif
#endif	/* Unix98 */


/* Type of a signal handler.  */
typedef void (*__sighandler_t) (int);

/* The X/Open definition of `signal' specifies the SVID semantic.  Use
   the additional function `sysv_signal' when X/Open compatibility is
   requested.  */
extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
     __THROW;
#ifdef __USE_GNU
extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
     __THROW;
#endif

/* Set the handler for the signal SIG to HANDLER, returning the old
   handler, or SIG_ERR on error.
   By default `signal' has the BSD semantic.  */
#ifdef __USE_BSD
extern __sighandler_t signal (int __sig, __sighandler_t __handler) __THROW;
#else
/* Make sure the used `signal' implementation is the SVID version. */
# ifdef __REDIRECT
extern __sighandler_t __REDIRECT (signal,
				  (int __sig,
				   __sighandler_t __handler) __THROW,
				  __sysv_signal);
# else
#  define signal __sysv_signal
# endif
#endif

#ifdef __USE_XOPEN
/* The X/Open definition of `signal' conflicts with the BSD version.
   So they defined another function `bsd_signal'.  */
extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler) __THROW;
#endif

/* Send signal SIG to process number PID.  If PID is zero,
   send SIG to all processes in the current process's process group.
   If PID is < -1, send SIG to all processes in process group - PID.  */
#ifdef __USE_POSIX
extern int kill (__pid_t __pid, int __sig) __THROW;
#endif /* Use POSIX.  */

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
/* Send SIG to all processes in process group PGRP.
   If PGRP is zero, send SIG to all processes in
   the current process's process group.  */
extern int killpg (__pid_t __pgrp, int __sig) __THROW;
#endif /* Use BSD || X/Open Unix.  */

/* Raise signal SIG, i.e., send SIG to yourself.  */
extern int raise (int __sig) __THROW;

#ifdef __USE_SVID
/* SVID names for the same things.  */
extern __sighandler_t ssignal (int __sig, __sighandler_t __handler) __THROW;
extern int gsignal (int __sig) __THROW;
#endif /* Use SVID.  */

#ifdef __USE_MISC
/* Print a message describing the meaning of the given signal number.  */
extern void psignal (int __sig, __const char *__s) __THROW;
#endif /* Use misc.  */


/* The `sigpause' function has two different interfaces.  The original
   BSD definition defines the argument as a mask of the signal, while
   the more modern interface in X/Open defines it as the signal
   number.  We go with the BSD version unless the user explicitly
   selects the X/Open version.  */
extern int __sigpause (int __sig_or_mask, int __is_sig) __THROW;

#ifdef __USE_BSD
/* Set the mask of blocked signals to MASK,
   wait for a signal to arrive, and then restore the mask.  */
extern int sigpause (int __mask) __THROW;
# define sigpause(mask) __sigpause ((mask), 0)
#else
# ifdef __USE_XOPEN
#  ifdef __GNUC__
extern int sigpause (int __sig) __asm__ ("__xpg_sigpause") __THROW;
#  endif
/* Remove a signal from the signal mask and suspend the process.  */
#  define sigpause(sig) __sigpause ((sig), 1)
# endif
#endif


#ifdef __USE_BSD
/* None of the following functions should be used anymore.  They are here
   only for compatibility.  A single word (`int') is not guaranteed to be
   enough to hold a complete signal mask and therefore these functions
   simply do not work in many situations.  Use `sigprocmask' instead.  */

/* Compute mask for signal SIG.  */
# define sigmask(sig)	__sigmask(sig)

/* Block signals in MASK, returning the old mask.  */
extern int sigblock (int __mask) __THROW;

/* Set the mask of blocked signals to MASK, returning the old mask.  */
extern int sigsetmask (int __mask) __THROW;

/* Return currently selected signal mask.  */
extern int siggetmask (void) __THROW;
#endif /* Use BSD.  */


#ifdef __USE_MISC
# define NSIG	_NSIG
#endif

#ifdef __USE_GNU
typedef __sighandler_t sighandler_t;
#endif

/* 4.4 BSD uses the name `sig_t' for this.  */
#ifdef __USE_BSD
typedef __sighandler_t sig_t;
#endif

#ifdef __USE_POSIX

# ifdef __USE_POSIX199309
/* We need `struct timespec' later on.  */
#  define __need_timespec
#  include <time.h>

/* Get the `siginfo_t' type plus the needed symbols.  */
#  include <bits/siginfo.h>
# endif

/* Clear all signals from SET.  */
extern int sigemptyset (sigset_t *__set) __THROW;

/* Set all signals in SET.  */
extern int sigfillset (sigset_t *__set) __THROW;

/* Add SIGNO to SET.  */
extern int sigaddset (sigset_t *__set, int __signo) __THROW;

/* Remove SIGNO from SET.  */
extern int sigdelset (sigset_t *__set, int __signo) __THROW;

/* Return 1 if SIGNO is in SET, 0 if not.  */
extern int sigismember (__const sigset_t *__set, int __signo) __THROW;

# ifdef __USE_GNU
/* Return non-empty value is SET is not empty.  */
extern int sigisemptyset (__const sigset_t *__set) __THROW;

/* Build new signal set by combining the two inputs set using logical AND.  */
extern int sigandset (sigset_t *__set, __const sigset_t *__left,
		      __const sigset_t *__right) __THROW;

/* Build new signal set by combining the two inputs set using logical OR.  */
extern int sigorset (sigset_t *__set, __const sigset_t *__left,
		     __const sigset_t *__right) __THROW;
# endif /* GNU */

/* Get the system-specific definitions of `struct sigaction'
   and the `SA_*' and `SIG_*'. constants.  */
# include <bits/sigaction.h>

/* Get and/or change the set of blocked signals.  */
extern int sigprocmask (int __how, __const sigset_t *__set, sigset_t *__oset)
     __THROW;

/* Change the set of blocked signals to SET,
   wait until a signal arrives, and restore the set of blocked signals.  */
extern int sigsuspend (__const </