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/* sig.h -- header file for signal handler definitions. */
/* Copyright (C) 1994-2005 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 __P((int));
#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 __P((int, SigHandler *)); /* 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) \
do { \
sigemptyset (&nvar); \
sigaddset (&nvar, sig); \
sigemptyset (&ovar); \
sigprocmask (SIG_BLOCK, &nvar, &ovar); \
} while (0)
#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 */
/* Extern variables */
extern volatile int sigwinch_received;
/* Functions from sig.c. */
extern sighandler termination_unwind_protect __P((int));
extern sighandler sigint_sighandler __P((int));
extern void initialize_signals __P((int));
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__));
extern sighandler sigwinch_sighandler __P((int));
extern void set_sigwinch_handler __P((void));
extern void unset_sigwinch_handler __P((void));
/* 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_ */
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