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- /* Modified by Klaus Gebhardt, October 1996 */
- /* 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. */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #define READLINE_LIBRARY
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <fcntl.h>
- #if defined (HAVE_SYS_FILE)
- # include <sys/file.h>
- #endif /* HAVE_SYS_FILE */
- #include <signal.h>
-
- #if defined (HAVE_UNISTD_H)
- # include <unistd.h>
- #endif /* HAVE_UNISTD_H */
-
- #if defined (HAVE_STDLIB_H)
- # include <stdlib.h>
- #else
- # include "ansi_stdlib.h"
- #endif /* HAVE_STDLIB_H */
-
- #include <errno.h>
- /* Not all systems declare ERRNO in errno.h... and some systems #define it! */
- #if !defined (errno)
- extern int errno;
- #endif /* !errno */
-
- #include "posixstat.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 */
-
- /* 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 ();
-
- /* This typedef is equivalant to the one for Function; it allows us
- to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
- typedef RETSIGTYPE SigHandler ();
-
-
- #if defined (__GO32__)
- # undef HANDLE_SIGNALS
- #endif /* __GO32__ */
-
- #if defined (STATIC_MALLOC)
- static char *xmalloc (), *xrealloc ();
- #else
- extern char *xmalloc (), *xrealloc ();
- #endif /* STATIC_MALLOC */
-
-
- /* **************************************************************** */
- /* */
- /* Signal Handling */
- /* */
- /* **************************************************************** */
-
- #if defined (SIGWINCH)
- static SigHandler *old_sigwinch = (SigHandler *)NULL;
-
- static RETSIGTYPE
- rl_handle_sigwinch (sig)
- int sig;
- {
- if (readline_echoing_p)
- {
- _rl_set_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
-
- if (old_sigwinch &&
- old_sigwinch != (SigHandler *)SIG_IGN &&
- old_sigwinch != (SigHandler *)SIG_DFL)
- (*old_sigwinch) (sig);
- #if RETSIGTYPE != void
- return (0);
- #endif
- }
- #endif /* SIGWINCH */
-
- #if defined (HANDLE_SIGNALS)
- /* Interrupt handling. */
- static SigHandler
- *old_int = (SigHandler *)NULL,
- #if defined (__EMX__)
- *old_break= (SigHandler *)NULL,
- *old_term = (SigHandler *)NULL,
- #endif
- *old_alrm = (SigHandler *)NULL;
- #if !defined (SHELL)
- static SigHandler
- *old_tstp = (SigHandler *)NULL,
- *old_ttou = (SigHandler *)NULL,
- *old_ttin = (SigHandler *)NULL,
- *old_cont = (SigHandler *)NULL;
- #endif /* !SHELL */
-
- /* Handle an interrupt character. */
- 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;
- # 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 ! defined (__EMX__)
- if (sig == SIGINT)
- #else
- if ((sig == SIGINT) || (sig == SIGBREAK))
- #endif
- signal (sig, SIG_IGN);
- #endif /* !HAVE_BSD_SIGNALS */
-
- switch (sig)
- {
- case SIGINT:
- #if defined (__EMX__)
- case SIGBREAK:
- #endif
- {
- 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:
- rl_clean_up_for_exit ();
- rl_deprep_terminal ();
- rl_clear_signals ();
- rl_pending_input = 0;
-
- #if defined (__EMX__)
- signal (sig, SIG_ACK);
- #endif
-
- #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_terminal (_rl_meta_flag);
- rl_set_signals ();
- }
-
- #if RETSIGTYPE != void
- return (0);
- #endif
- }
-
- #if defined (HAVE_POSIX_SIGNALS)
- static SigHandler *
- rl_set_sighandler (sig, handler)
- int sig;
- SigHandler *handler;
- {
- struct sigaction act, oact;
-
- act.sa_handler = handler;
- act.sa_flags = 0;
- sigemptyset (&act.sa_mask);
- sigemptyset (&oact.sa_mask);
- sigaction (sig, &act, &oact);
- return (oact.sa_handler);
- }
-
- #else /* !HAVE_POSIX_SIGNALS */
- # define rl_set_sighandler(sig, handler) (SigHandler *)signal (sig, handler)
- #endif /* !HAVE_POSIX_SIGNALS */
-
- rl_set_signals ()
- {
- old_int = (SigHandler *)rl_set_sighandler (SIGINT, rl_signal_handler);
- if (old_int == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGINT, SIG_IGN);
-
- #if defined (__EMX__)
- old_break = (SigHandler *)rl_set_sighandler (SIGBREAK, rl_signal_handler);
- if (old_break == (SigHandler *)SIG_IGN)
- signal (SIGBREAK, SIG_IGN);
- #endif
-
- old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
- if (old_alrm == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGALRM, SIG_IGN);
-
- #if !defined (SHELL)
-
- #if defined (SIGTSTP)
- old_tstp = (SigHandler *)rl_set_sighandler (SIGTSTP, rl_signal_handler);
- if (old_tstp == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGTSTP, SIG_IGN);
- #endif /* SIGTSTP */
- #if defined (SIGTTOU)
- old_ttou = (SigHandler *)rl_set_sighandler (SIGTTOU, rl_signal_handler);
- old_ttin = (SigHandler *)rl_set_sighandler (SIGTTIN, rl_signal_handler);
-
- if (old_tstp == (SigHandler *)SIG_IGN)
- {
- rl_set_sighandler (SIGTTOU, SIG_IGN);
- rl_set_sighandler (SIGTTIN, SIG_IGN);
- }
- #endif /* SIGTTOU */
-
- #endif /* !SHELL */
-
- #if defined (SIGWINCH)
- old_sigwinch =
- (SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
- #endif /* SIGWINCH */
- return 0;
- }
-
- rl_clear_signals ()
- {
- rl_set_sighandler (SIGINT, old_int);
- #if defined (__EMX__)
- rl_set_sighandler (SIGBREAK, old_break);
- #endif
- rl_set_sighandler (SIGALRM, old_alrm);
-
- #if !defined (SHELL)
-
- #if defined (SIGTSTP)
- rl_set_sighandler (SIGTSTP, old_tstp);
- #endif
-
- #if defined (SIGTTOU)
- rl_set_sighandler (SIGTTOU, old_ttou);
- rl_set_sighandler (SIGTTIN, old_ttin);
- #endif /* SIGTTOU */
-
- #endif /* !SHELL */
-
- #if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, old_sigwinch);
- #endif
-
- return 0;
- }
- #endif /* HANDLE_SIGNALS */
-