diff options
Diffstat (limited to 'readline/signals.c')
| -rw-r--r-- | readline/signals.c | 363 |
1 files changed, 0 insertions, 363 deletions
diff --git a/readline/signals.c b/readline/signals.c deleted file mode 100644 index e19c22d..0000000 --- a/readline/signals.c +++ /dev/null @@ -1,363 +0,0 @@ -/* signals.c -- signal handling support for readline. */ - -/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. - - This file is part of the GNU Readline Library, a library for - reading lines of text with interactive input and history editing. - - The GNU Readline Library 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 1, or - (at your option) any later version. - - The GNU Readline Library 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. - - The GNU General Public License is often shipped with GNU software, and - is generally kept in a file called COPYING or LICENSE. If you do not - have a copy of the license, write to the Free Software Foundation, - 675 Mass Ave, Cambridge, MA 02139, USA. */ -#define READLINE_LIBRARY - -#if defined (HAVE_CONFIG_H) -# include <config.h> -#endif - -#include <stdio.h> /* Just for NULL. Yuck. */ -#include <sys/types.h> -#include <signal.h> - -#if defined (HAVE_UNISTD_H) -# include <unistd.h> -#endif /* HAVE_UNISTD_H */ - -/* System-specific feature definitions and include files. */ -#include "rldefs.h" - -#if defined (GWINSZ_IN_SYS_IOCTL) -# include <sys/ioctl.h> -#endif /* GWINSZ_IN_SYS_IOCTL */ - -#if defined (__GO32__) -# undef HANDLE_SIGNALS -#endif /* __GO32__ */ - -#if defined (HANDLE_SIGNALS) -/* Some standard library routines. */ -#include "readline.h" -#include "history.h" - -extern int readline_echoing_p; -extern int rl_pending_input; -extern int _rl_meta_flag; - -extern void free_undo_list (); -extern void _rl_get_screen_size (); -extern void _rl_redisplay_after_sigwinch (); -extern void _rl_clean_up_for_exit (); -extern void _rl_kill_kbd_macro (); -extern void _rl_init_argument (); -extern void rl_deprep_terminal (), rl_prep_terminal (); - -#if !defined (RETSIGTYPE) -# if defined (VOID_SIGHANDLER) -# define RETSIGTYPE void -# else -# define RETSIGTYPE int -# endif /* !VOID_SIGHANDLER */ -#endif /* !RETSIGTYPE */ - -#if defined (VOID_SIGHANDLER) -# define SIGHANDLER_RETURN return -#else -# define SIGHANDLER_RETURN return (0) -#endif - -/* This typedef is equivalant to the one for Function; it allows us - to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */ -typedef RETSIGTYPE SigHandler (); - -static SigHandler *rl_set_sighandler (); - -/* **************************************************************** */ -/* */ -/* Signal Handling */ -/* */ -/* **************************************************************** */ - -/* If we're not being compiled as part of bash, initialize handlers for - and catch the job control signals (SIGTTIN, SIGTTOU, SIGTSTP) and - SIGTERM. */ -#if !defined (SHELL) -# define HANDLE_JOB_SIGNALS -# define HANDLE_SIGTERM -#endif /* !SHELL */ - -#if defined (HAVE_POSIX_SIGNALS) -typedef struct sigaction sighandler_cxt; -# define rl_sigaction(s, nh, oh) sigaction(s, nh, oh) -#else -typedef struct { SigHandler *sa_handler; } sighandler_cxt; -# define sigemptyset(m) -#endif /* !HAVE_POSIX_SIGNALS */ - -static sighandler_cxt old_int, old_alrm; - -#if defined (HANDLE_JOB_SIGNALS) -static sighandler_cxt old_tstp, old_ttou, old_ttin; -#endif /* HANDLE_JOB_SIGNALS */ - -#if defined (HANDLE_SIGTERM) -static sighandler_cxt old_term; -#endif - -#if defined (SIGWINCH) -static sighandler_cxt old_winch; -#endif - -/* Readline signal handler functions. */ - -static RETSIGTYPE -rl_signal_handler (sig) - int sig; -{ -#if defined (HAVE_POSIX_SIGNALS) - sigset_t set; -#else /* !HAVE_POSIX_SIGNALS */ -# if defined (HAVE_BSD_SIGNALS) - long omask; -# else /* !HAVE_BSD_SIGNALS */ - sighandler_cxt dummy_cxt; /* needed for rl_set_sighandler call */ -# endif /* !HAVE_BSD_SIGNALS */ -#endif /* !HAVE_POSIX_SIGNALS */ - -#if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS) - /* Since the signal will not be blocked while we are in the signal - handler, ignore it until rl_clear_signals resets the catcher. */ - if (sig == SIGINT || sig == SIGALRM) - rl_set_sighandler (sig, SIG_IGN, &dummy_cxt); -#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */ - - switch (sig) - { - case SIGINT: - { - register HIST_ENTRY *entry; - - free_undo_list (); - - entry = current_history (); - if (entry) - entry->data = (char *)NULL; - } - _rl_kill_kbd_macro (); - rl_clear_message (); - _rl_init_argument (); - -#if defined (SIGTSTP) - case SIGTSTP: - case SIGTTOU: - case SIGTTIN: -#endif /* SIGTSTP */ - case SIGALRM: - case SIGTERM: - _rl_clean_up_for_exit (); - (*rl_deprep_term_function) (); - rl_clear_signals (); - rl_pending_input = 0; - -#if defined (HAVE_POSIX_SIGNALS) - sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set); - sigdelset (&set, sig); -#else /* !HAVE_POSIX_SIGNALS */ -# if defined (HAVE_BSD_SIGNALS) - omask = sigblock (0); -# endif /* HAVE_BSD_SIGNALS */ -#endif /* !HAVE_POSIX_SIGNALS */ - - kill (getpid (), sig); - - /* Let the signal that we just sent through. */ -#if defined (HAVE_POSIX_SIGNALS) - sigprocmask (SIG_SETMASK, &set, (sigset_t *)NULL); -#else /* !HAVE_POSIX_SIGNALS */ -# if defined (HAVE_BSD_SIGNALS) - sigsetmask (omask & ~(sigmask (sig))); -# endif /* HAVE_BSD_SIGNALS */ -#endif /* !HAVE_POSIX_SIGNALS */ - - (*rl_prep_term_function) (_rl_meta_flag); - rl_set_signals (); - } - - SIGHANDLER_RETURN; -} - -#if defined (SIGWINCH) -static RETSIGTYPE -rl_handle_sigwinch (sig) - int sig; -{ - SigHandler *oh; - -#if defined (MUST_REINSTALL_SIGHANDLERS) - sighandler_cxt dummy_winch; - - /* We don't want to change old_winch -- it holds the state of SIGWINCH - disposition set by the calling application. We need this state - because we call the application's SIGWINCH handler after updating - our own idea of the screen size. */ - rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &dummy_winch); -#endif - - if (readline_echoing_p) - { - _rl_get_screen_size (fileno (rl_instream), 1); - _rl_redisplay_after_sigwinch (); - } - - /* If another sigwinch handler has been installed, call it. */ - oh = (SigHandler *)old_winch.sa_handler; - if (oh && oh != (SigHandler *)SIG_IGN && oh != (SigHandler *)SIG_DFL) - (*oh) (sig); - - SIGHANDLER_RETURN; -} -#endif /* SIGWINCH */ - -/* Functions to manage signal handling. */ - -#if !defined (HAVE_POSIX_SIGNALS) -static int -rl_sigaction (sig, nh, oh) - int sig; - sighandler_cxt *nh, *oh; -{ - oh->sa_handler = signal (sig, nh->sa_handler); - return 0; -} -#endif /* !HAVE_POSIX_SIGNALS */ - -/* Set up a readline-specific signal handler, saving the old signal - information in OHANDLER. Return the old signal handler, like - signal(). */ -static SigHandler * -rl_set_sighandler (sig, handler, ohandler) - int sig; - SigHandler *handler; - sighandler_cxt *ohandler; -{ -#if defined (HAVE_POSIX_SIGNALS) - struct sigaction act; - - act.sa_handler = handler; - act.sa_flags = 0; - sigemptyset (&act.sa_mask); - sigemptyset (&ohandler->sa_mask); - sigaction (sig, &act, ohandler); -#else - ohandler->sa_handler = (SigHandler *)signal (sig, handler); -#endif /* !HAVE_POSIX_SIGNALS */ - return (ohandler->sa_handler); -} - -int -rl_set_signals () -{ - sighandler_cxt dummy; - SigHandler *oh; - -#if defined (HAVE_POSIX_SIGNALS) - sigemptyset (&dummy.sa_mask); -#endif - - oh = rl_set_sighandler (SIGINT, rl_signal_handler, &old_int); - if (oh == (SigHandler *)SIG_IGN) - rl_sigaction (SIGINT, &old_int, &dummy); - - oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm); - if (oh == (SigHandler *)SIG_IGN) - rl_sigaction (SIGALRM, &old_alrm, &dummy); -#if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART) - /* If the application using readline has already installed a signal - handler with SA_RESTART, SIGALRM will cause reads to be restarted - automatically, so readline should just get out of the way. Since - we tested for SIG_IGN above, we can just test for SIG_DFL here. */ - if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART)) - rl_sigaction (SIGALRM, &old_alrm, &dummy); -#endif /* HAVE_POSIX_SIGNALS */ - -#if defined (HANDLE_JOB_SIGNALS) - -#if defined (SIGTSTP) - oh = rl_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp); - if (oh == (SigHandler *)SIG_IGN) - rl_sigaction (SIGTSTP, &old_tstp, &dummy); -#else - oh = (SigHandler *)NULL; -#endif /* SIGTSTP */ - -#if defined (SIGTTOU) - rl_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou); - rl_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin); - - if (oh == (SigHandler *)SIG_IGN) - { - rl_set_sighandler (SIGTTOU, SIG_IGN, &dummy); - rl_set_sighandler (SIGTTIN, SIG_IGN, &dummy); - } -#endif /* SIGTTOU */ - -#endif /* HANDLE_JOB_SIGNALS */ - -#if defined (HANDLE_SIGTERM) - /* Handle SIGTERM if we're not being compiled as part of bash. */ - rl_set_sighandler (SIGTERM, rl_signal_handler, &old_term); -#endif /* HANDLE_SIGTERM */ - -#if defined (SIGWINCH) - rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &old_winch); -#endif /* SIGWINCH */ - - return 0; -} - -int -rl_clear_signals () -{ - sighandler_cxt dummy; - -#if defined (HAVE_POSIX_SIGNALS) - sigemptyset (&dummy.sa_mask); -#endif - - rl_sigaction (SIGINT, &old_int, &dummy); - rl_sigaction (SIGALRM, &old_alrm, &dummy); - -#if defined (HANDLE_JOB_SIGNALS) - -#if defined (SIGTSTP) - rl_sigaction (SIGTSTP, &old_tstp, &dummy); -#endif - -#if defined (SIGTTOU) - rl_sigaction (SIGTTOU, &old_ttou, &dummy); - rl_sigaction (SIGTTIN, &old_ttin, &dummy); -#endif /* SIGTTOU */ - -#endif /* HANDLE_JOB_SIGNALS */ - -#if defined (HANDLE_SIGTERM) - rl_sigaction (SIGTERM, &old_term, &dummy); -#endif /* HANDLE_SIGTERM */ - -#if defined (SIGWINCH) - sigemptyset (&dummy.sa_mask); - rl_sigaction (SIGWINCH, &old_winch, &dummy); -#endif - - return 0; -} -#endif /* HANDLE_SIGNALS */ |