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Diffstat (limited to 'sig.h')
| -rw-r--r-- | sig.h | 136 |
1 files changed, 136 insertions, 0 deletions
@@ -0,0 +1,136 @@ +/* sig.h -- header file for signal handler definitions. */ + +/* Copyright (C) 1994-2021 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 PARAMS((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 PARAMS((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 PARAMS((int)); +extern void termsig_handler PARAMS((int)); +extern sighandler sigint_sighandler PARAMS((int)); +extern void initialize_signals PARAMS((int)); +extern void initialize_terminating_signals PARAMS((void)); +extern void reset_terminating_signals PARAMS((void)); +extern void top_level_cleanup PARAMS((void)); +extern void throw_to_top_level PARAMS((void)); +extern void jump_to_top_level PARAMS((int)) __attribute__((__noreturn__)); +extern void restore_sigmask PARAMS((void)); + +extern sighandler sigwinch_sighandler PARAMS((int)); +extern void set_sigwinch_handler PARAMS((void)); +extern void unset_sigwinch_handler PARAMS((void)); + +extern sighandler sigterm_sighandler PARAMS((int)); + +/* Functions defined in trap.c. */ +extern SigHandler *set_sigint_handler PARAMS((void)); +extern SigHandler *trap_to_sighandler PARAMS((int)); +extern sighandler trap_handler PARAMS((int)); + +extern int block_trapped_signals PARAMS((sigset_t *, sigset_t *)); +extern int unblock_trapped_signals PARAMS((sigset_t *)); +#endif /* _SIG_H_ */ |