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/* quit.h -- How to handle SIGINT gracefully. */
/* Copyright (C) 1993-2013 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/>.
*/
#if !defined (_QUIT_H_)
#define _QUIT_H_
#include "sig.h" /* for sig_atomic_t */
/* Non-zero means SIGINT has already occurred. */
extern volatile sig_atomic_t interrupt_state;
extern volatile sig_atomic_t terminating_signal;
/* Macro to call a great deal. SIGINT just sets the interrupt_state variable.
When it is safe, put QUIT in the code, and the "interrupt" will take
place. The same scheme is used for terminating signals (e.g., SIGHUP)
and the terminating_signal variable. That calls a function which will
end up exiting the shell. */
#define QUIT \
do { \
if (terminating_signal) termsig_handler (terminating_signal); \
if (interrupt_state) throw_to_top_level (); \
} while (0)
#define CHECK_ALRM \
do { \
if (sigalrm_seen) \
sh_longjmp (alrmbuf, 1); \
} while (0)
#define SETINTERRUPT interrupt_state = 1
#define CLRINTERRUPT interrupt_state = 0
#define ADDINTERRUPT interrupt_state++
#define DELINTERRUPT interrupt_state--
#define ISINTERRUPT interrupt_state != 0
/* The same sort of thing, this time just for signals that would ordinarily
cause the shell to terminate. */
#define CHECK_TERMSIG \
do { \
if (terminating_signal) termsig_handler (terminating_signal); \
} while (0)
#define LASTSIG() \
(terminating_signal ? terminating_signal : (interrupt_state ? SIGINT : 0))
#define CHECK_WAIT_INTR \
do { \
if (wait_intr_flag && wait_signal_received && this_shell_builtin && (this_shell_builtin == wait_builtin)) \
sh_longjmp (wait_intr_buf, 1); \
} while (0)
#define RESET_SIGTERM \
do { \
sigterm_received = 0; \
} while (0)
#define CHECK_SIGTERM \
do { \
if (sigterm_received) termsig_handler (SIGTERM); \
} while (0)
#endif /* _QUIT_H_ */
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