53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/* quit.h -- How to handle SIGINT gracefully. */
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/* Copyright (C) 1993-2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined (_QUIT_H_)
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#define _QUIT_H_
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/* Non-zero means SIGINT has already ocurred. */
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extern volatile int interrupt_state;
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extern volatile int terminating_signal;
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/* Macro to call a great deal. SIGINT just sets the interrupt_state variable.
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When it is safe, put QUIT in the code, and the "interrupt" will take
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place. The same scheme is used for terminating signals (e.g., SIGHUP)
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and the terminating_signal variable. That calls a function which will
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end up exiting the shell. */
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#define QUIT \
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do { \
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if (terminating_signal) termsig_handler (terminating_signal); \
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if (interrupt_state) throw_to_top_level (); \
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} while (0)
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#define SETINTERRUPT interrupt_state = 1
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#define CLRINTERRUPT interrupt_state = 0
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#define ADDINTERRUPT interrupt_state++
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#define DELINTERRUPT interrupt_state--
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/* The same sort of thing, this time just for signals that would ordinarily
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cause the shell to terminate. */
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#define CHECK_TERMSIG \
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do { \
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if (terminating_signal) termsig_handler (terminating_signal); \
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} while (0)
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#endif /* _QUIT_H_ */
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