File: sig.h

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/* sig.h -- header file for signal handler definitions. */

/* Copyright (C) 1994 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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.

   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

/* Make sure that this is included *after* config.h! */

#if !defined (_SIG_H_)
#  define _SIG_H_

#include "stdc.h"

#if !defined (SIGABRT) && defined (SIGIOT)
#  define SIGABRT SIGIOT
#endif

#define sighandler RETSIGTYPE
typedef RETSIGTYPE SigHandler ();

#if defined (VOID_SIGHANDLER)
#  define SIGRETURN(n)	return
#else
#  define SIGRETURN(n)	return(n)
#endif /* !VOID_SIGHANDLER */

/* Here is a definition for set_signal_handler () which simply expands to
   a call to signal () for non-Posix systems.  The code for set_signal_handler
   in the Posix case resides in general.c. */
#if !defined (HAVE_POSIX_SIGNALS)
#  define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
#else
extern SigHandler *set_signal_handler ();	/* in sig.c */
#endif /* _POSIX_VERSION */

/* Definitions used by the job control code. */
#if defined (JOB_CONTROL)

#if !defined (SIGCHLD) && defined (SIGCLD)
#  define SIGCHLD SIGCLD
#endif

#if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
#  define sigmask(x) (1 << ((x)-1))
#endif /* !HAVE_POSIX_SIGNALS && !sigmask */

#if !defined (HAVE_POSIX_SIGNALS)
#  if !defined (SIG_BLOCK)
#    define SIG_BLOCK 2
#    define SIG_SETMASK 3
#  endif /* SIG_BLOCK */

/* sigset_t defined in config.h */

/* Make sure there is nothing inside the signal set. */
#  define sigemptyset(set) (*(set) = 0)

/* Initialize the signal set to hold all signals. */
#  define sigfillset(set) (*set) = sigmask (NSIG) - 1

/* Add SIG to the contents of SET. */
#  define sigaddset(set, sig) *(set) |= sigmask (sig)

/* Delete SIG from signal set SET. */
#  define sigdelset(set, sig) *(set) &= ~sigmask (sig)

/* Is SIG a member of the signal set SET? */
#  define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)

/* Suspend the process until the reception of one of the signals
   not present in SET. */
#  define sigsuspend(set) sigpause (*(set))
#endif /* !HAVE_POSIX_SIGNALS */

/* These definitions are used both in POSIX and non-POSIX implementations. */

#define BLOCK_SIGNAL(sig, nvar, ovar) \
  sigemptyset (&nvar); \
  sigaddset (&nvar, sig); \
  sigemptyset (&ovar); \
  sigprocmask (SIG_BLOCK, &nvar, &ovar)

#if defined (HAVE_POSIX_SIGNALS)
#  define BLOCK_CHILD(nvar, ovar) \
	BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
#  define UNBLOCK_CHILD(ovar) \
	sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
#else /* !HAVE_POSIX_SIGNALS */
#  define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
#  define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif /* !HAVE_POSIX_SIGNALS */

#endif /* JOB_CONTROL */

/* Functions from sig.c. */
extern sighandler termination_unwind_protect __P((int));
extern sighandler sigint_sighandler __P((int));
extern void initialize_signals __P((void));
extern void reinitialize_signals __P((void));
extern void initialize_terminating_signals __P((void));
extern void reset_terminating_signals __P((void));
extern void throw_to_top_level __P((void));
extern void jump_to_top_level __P((int)) __attribute__((__noreturn__));

/* Functions defined in trap.c. */
extern SigHandler *set_sigint_handler __P((void));
extern SigHandler *trap_to_sighandler __P((int));
extern sighandler trap_handler __P((int));

#endif /* _SIG_H_ */