[thirdparty/bash.git] / sig.h

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

/* Copyright (C) 1994-2013 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
*/

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

#if !defined (_SIG_H_)
#  define _SIG_H_

#include "stdc.h"

#include <signal.h>		/* for sig_atomic_t */

#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 */

#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)

#define UNBLOCK_SIGNAL(ovar) sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)

#if defined (HAVE_POSIX_SIGNALS)
#  define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
#  define UNBLOCK_CHILD(ovar) UNBLOCK_SIGNAL(ovar)
#else /* !HAVE_POSIX_SIGNALS */
#  define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
#  define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif /* !HAVE_POSIX_SIGNALS */

/* Extern variables */
extern volatile sig_atomic_t sigwinch_received;
extern volatile sig_atomic_t sigterm_received;

extern int interrupt_immediately;	/* no longer used */
extern int terminate_immediately;

/* Functions from sig.c. */
extern sighandler termsig_sighandler __P((int));
extern void termsig_handler __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 top_level_cleanup __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));

extern sighandler sigterm_sighandler __P((int));

/* 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_ */
Commit	Line	Data
	1	/* sig.h -- header file for signal handler definitions. */
	2
	3	/* Copyright (C) 1994-2013 Free Software Foundation, Inc.
	4
	5	This file is part of GNU Bash, the Bourne Again SHell.
	6
	7	Bash is free software: you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation, either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	Bash is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with Bash. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	/* Make sure that this is included after config.h! */
	22
	23	#if !defined (_SIG_H_)
	24	# define _SIG_H_
	25
	26	#include "stdc.h"
	27
	28	#include <signal.h> /* for sig_atomic_t */
	29
	30	#if !defined (SIGABRT) && defined (SIGIOT)
	31	# define SIGABRT SIGIOT
	32	#endif
	33
	34	#define sighandler RETSIGTYPE
	35	typedef RETSIGTYPE SigHandler __P((int));
	36
	37	#if defined (VOID_SIGHANDLER)
	38	# define SIGRETURN(n) return
	39	#else
	40	# define SIGRETURN(n) return(n)
	41	#endif /* !VOID_SIGHANDLER */
	42
	43	/* Here is a definition for set_signal_handler () which simply expands to
	44	a call to signal () for non-Posix systems. The code for set_signal_handler
	45	in the Posix case resides in general.c. */
	46	#if !defined (HAVE_POSIX_SIGNALS)
	47	# define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
	48	#else
	49	extern SigHandler set_signal_handler __P((int, SigHandler )); /* in sig.c */
	50	#endif /* _POSIX_VERSION */
	51
	52	#if !defined (SIGCHLD) && defined (SIGCLD)
	53	# define SIGCHLD SIGCLD
	54	#endif
	55
	56	#if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
	57	# define sigmask(x) (1 << ((x)-1))
	58	#endif /* !HAVE_POSIX_SIGNALS && !sigmask */
	59
	60	#if !defined (HAVE_POSIX_SIGNALS)
	61	# if !defined (SIG_BLOCK)
	62	# define SIG_BLOCK 2
	63	# define SIG_SETMASK 3
	64	# endif /* SIG_BLOCK */
	65
	66	/* sigset_t defined in config.h */
	67
	68	/* Make sure there is nothing inside the signal set. */
	69	# define sigemptyset(set) (*(set) = 0)
	70
	71	/* Initialize the signal set to hold all signals. */
	72	# define sigfillset(set) (*set) = sigmask (NSIG) - 1
	73
	74	/* Add SIG to the contents of SET. */
	75	# define sigaddset(set, sig) *(set) \|= sigmask (sig)
	76
	77	/* Delete SIG from signal set SET. */
	78	# define sigdelset(set, sig) *(set) &= ~sigmask (sig)
	79
	80	/* Is SIG a member of the signal set SET? */
	81	# define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
	82
	83	/* Suspend the process until the reception of one of the signals
	84	not present in SET. */
	85	# define sigsuspend(set) sigpause (*(set))
	86	#endif /* !HAVE_POSIX_SIGNALS */
	87
	88	/* These definitions are used both in POSIX and non-POSIX implementations. */
	89
	90	#define BLOCK_SIGNAL(sig, nvar, ovar) \
	91	do { \
	92	sigemptyset (&nvar); \
	93	sigaddset (&nvar, sig); \
	94	sigemptyset (&ovar); \
	95	sigprocmask (SIG_BLOCK, &nvar, &ovar); \
	96	} while (0)
	97
	98	#define UNBLOCK_SIGNAL(ovar) sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
	99
	100	#if defined (HAVE_POSIX_SIGNALS)
	101	# define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
	102	# define UNBLOCK_CHILD(ovar) UNBLOCK_SIGNAL(ovar)
	103	#else /* !HAVE_POSIX_SIGNALS */
	104	# define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
	105	# define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
	106	#endif /* !HAVE_POSIX_SIGNALS */
	107
	108	/* Extern variables */
	109	extern volatile sig_atomic_t sigwinch_received;
	110	extern volatile sig_atomic_t sigterm_received;
	111
	112	extern int interrupt_immediately; /* no longer used */
	113	extern int terminate_immediately;
	114
	115	/* Functions from sig.c. */
	116	extern sighandler termsig_sighandler __P((int));
	117	extern void termsig_handler __P((int));
	118	extern sighandler sigint_sighandler __P((int));
	119	extern void initialize_signals __P((int));
	120	extern void initialize_terminating_signals __P((void));
	121	extern void reset_terminating_signals __P((void));
	122	extern void top_level_cleanup __P((void));
	123	extern void throw_to_top_level __P((void));
	124	extern void jump_to_top_level __P((int)) __attribute__((__noreturn__));
	125
	126	extern sighandler sigwinch_sighandler __P((int));
	127	extern void set_sigwinch_handler __P((void));
	128	extern void unset_sigwinch_handler __P((void));
	129
	130	extern sighandler sigterm_sighandler __P((int));
	131
	132	/* Functions defined in trap.c. */
	133	extern SigHandler *set_sigint_handler __P((void));
	134	extern SigHandler *trap_to_sighandler __P((int));
	135	extern sighandler trap_handler __P((int));
	136
	137	#endif /* _SIG_H_ */