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Diffstat (limited to '')
| -rw-r--r-- | quit.h | 75 |
1 files changed, 75 insertions, 0 deletions
@@ -0,0 +1,75 @@ +/* quit.h -- How to handle SIGINT gracefully. */ + +/* Copyright (C) 1993-2021 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/>. +*/ + +#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 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_ */ |