| /* 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) \ |
| longjmp (alrmbuf, 1); \ |
| } 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) |
| |
| #define LASTSIG() \ |
| (terminating_signal ? terminating_signal : (interrupt_state ? SIGINT : 0)) |
| |
| #define CHECK_WAIT_INTR \ |
| do { \ |
| if (wait_signal_received && this_shell_builtin && (this_shell_builtin == wait_builtin)) \ |
| 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_ */ |