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/* sig.h -- header file for signal handler definitions. */
/* Copyright (C) 1994-2022 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 void
typedef void SigHandler (int);
#define SIGRETURN(n) return
/* 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 (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;
extern volatile int builtin_catch_sigpipe; /* not used yet */
/* Functions from sig.c. */
extern sighandler termsig_sighandler (int);
extern void termsig_handler (int);
extern sighandler sigint_sighandler (int);
extern void initialize_signals (int);
extern void initialize_terminating_signals (void);
extern void reset_terminating_signals (void);
extern void top_level_cleanup (void);
extern void throw_to_top_level (void);
extern void jump_to_top_level (int) __attribute__((__noreturn__));
extern void restore_sigmask (void);
extern sighandler sigwinch_sighandler (int);
extern void set_sigwinch_handler (void);
extern void unset_sigwinch_handler (void);
extern sighandler sigterm_sighandler (int);
extern void sigpipe_handler (int);
/* Functions defined in trap.c. */
extern SigHandler *set_sigint_handler (void);
extern SigHandler *trap_to_sighandler (int);
extern sighandler trap_handler (int);
extern int block_trapped_signals (sigset_t *, sigset_t *);
extern int unblock_trapped_signals (sigset_t *);
#endif /* _SIG_H_ */
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