53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/* quit.h -- How to handle SIGINT gracefully. */
|
|
|
|
/* Copyright (C) 1993 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. */
|
|
|
|
#if !defined (_QUIT_H_)
|
|
#define _QUIT_H_
|
|
|
|
/* Non-zero means SIGINT has already ocurred. */
|
|
extern volatile int interrupt_state;
|
|
extern volatile int 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 SETINTERRUPT interrupt_state = 1
|
|
#define CLRINTERRUPT interrupt_state = 0
|
|
|
|
#define ADDINTERRUPT interrupt_state++
|
|
#define DELINTERRUPT interrupt_state--
|
|
|
|
/* 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)
|
|
|
|
#endif /* _QUIT_H_ */
|