249 lines
6.2 KiB
C
249 lines
6.2 KiB
C
/* signals.c -- signal handling support for readline. */
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/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 1, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#if !defined (NO_SYS_FILE)
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# include <sys/file.h>
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#endif /* !NO_SYS_FILE */
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#include <signal.h>
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/* This is needed to include support for TIOCGWINSZ and window resizing. */
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#if defined (OSF1) || defined (BSD386) || defined (_386BSD) || defined (__BSD_4_4__) || defined (AIX)
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# include <sys/ioctl.h>
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#endif /* OSF1 || BSD386 || _386BSD || __BSD_4_4__ || AIX */
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#include <errno.h>
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/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
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#if !defined (errno)
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extern int errno;
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#endif /* !errno */
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "history.h"
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static void cr ();
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extern int readline_echoing_p;
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extern int rl_pending_input;
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extern int _rl_meta_flag;
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#ifdef __STDC__
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extern void _rl_output_character_function (int);
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#else
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extern void _rl_output_character_function ();
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#endif
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extern void free_undo_list ();
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#if defined (VOID_SIGHANDLER)
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# define sighandler void
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#else
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# define sighandler int
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#endif /* VOID_SIGHANDLER */
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/* This typedef is equivalant to the one for Function; it allows us
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to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
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typedef sighandler SigHandler ();
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/* **************************************************************** */
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/* */
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/* Signal Handling */
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/* */
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/* **************************************************************** */
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#if defined (HANDLE_SIGNALS)
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#if defined (SIGWINCH)
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static SigHandler *old_sigwinch = (SigHandler *)NULL;
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static sighandler
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rl_handle_sigwinch (sig)
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int sig;
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{
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if (readline_echoing_p)
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{
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_rl_set_screen_size (fileno (rl_instream), 1);
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cr (); /* was crlf () */
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rl_forced_update_display ();
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}
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if (old_sigwinch &&
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old_sigwinch != (SigHandler *)SIG_IGN &&
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old_sigwinch != (SigHandler *)SIG_DFL)
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(*old_sigwinch) (sig);
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#if !defined (VOID_SIGHANDLER)
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return (0);
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#endif /* VOID_SIGHANDLER */
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}
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#endif /* SIGWINCH */
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/* Interrupt handling. */
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static SigHandler
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*old_int = (SigHandler *)NULL,
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*old_tstp = (SigHandler *)NULL,
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*old_ttou = (SigHandler *)NULL,
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*old_ttin = (SigHandler *)NULL,
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*old_cont = (SigHandler *)NULL,
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*old_alrm = (SigHandler *)NULL;
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/* Handle an interrupt character. */
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static sighandler
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rl_signal_handler (sig)
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int sig;
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{
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#if !defined (HAVE_BSD_SIGNALS) && !defined (HAVE_POSIX_SIGNALS)
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/* Since the signal will not be blocked while we are in the signal
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handler, ignore it until rl_clear_signals resets the catcher. */
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if (sig == SIGINT)
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signal (sig, SIG_IGN);
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#endif /* !HAVE_BSD_SIGNALS */
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switch (sig)
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{
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case SIGINT:
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{
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register HIST_ENTRY *entry;
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free_undo_list ();
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entry = current_history ();
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if (entry)
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entry->data = (char *)NULL;
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}
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_rl_kill_kbd_macro ();
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rl_clear_message ();
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rl_init_argument ();
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#if defined (SIGTSTP)
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case SIGTSTP:
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case SIGTTOU:
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case SIGTTIN:
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#endif /* SIGTSTP */
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case SIGALRM:
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rl_clean_up_for_exit ();
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rl_deprep_terminal ();
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rl_clear_signals ();
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rl_pending_input = 0;
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kill (getpid (), sig);
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SIGNALS_UNBLOCK;
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rl_prep_terminal (_rl_meta_flag);
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rl_set_signals ();
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}
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#if !defined (VOID_SIGHANDLER)
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return (0);
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#endif /* !VOID_SIGHANDLER */
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}
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#if defined (HAVE_POSIX_SIGNALS)
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static SigHandler *
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rl_set_sighandler (sig, handler)
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int sig;
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SigHandler *handler;
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{
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struct sigaction act, oact;
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act.sa_handler = handler;
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act.sa_flags = 0;
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sigemptyset (&act.sa_mask);
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sigemptyset (&oact.sa_mask);
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sigaction (sig, &act, &oact);
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return (oact.sa_handler);
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}
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#else /* !HAVE_POSIX_SIGNALS */
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# define rl_set_sighandler(sig, handler) (SigHandler *)signal (sig, handler)
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#endif /* !HAVE_POSIX_SIGNALS */
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rl_set_signals ()
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{
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old_int = (SigHandler *)rl_set_sighandler (SIGINT, rl_signal_handler);
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if (old_int == (SigHandler *)SIG_IGN)
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signal (SIGINT, SIG_IGN);
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old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
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if (old_alrm == (SigHandler *)SIG_IGN)
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signal (SIGALRM, SIG_IGN);
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#if defined (SIGTSTP)
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old_tstp = (SigHandler *)rl_set_sighandler (SIGTSTP, rl_signal_handler);
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if (old_tstp == (SigHandler *)SIG_IGN)
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signal (SIGTSTP, SIG_IGN);
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#endif
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#if defined (SIGTTOU)
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old_ttou = (SigHandler *)rl_set_sighandler (SIGTTOU, rl_signal_handler);
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old_ttin = (SigHandler *)rl_set_sighandler (SIGTTIN, rl_signal_handler);
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if (old_tstp == (SigHandler *)SIG_IGN)
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{
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signal (SIGTTOU, SIG_IGN);
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signal (SIGTTIN, SIG_IGN);
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}
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#endif
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#if defined (SIGWINCH)
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old_sigwinch =
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(SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
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#endif
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}
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rl_clear_signals ()
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{
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rl_set_sighandler (SIGINT, old_int);
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rl_set_sighandler (SIGALRM, old_alrm);
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#if defined (SIGTSTP)
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signal (SIGTSTP, old_tstp);
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#endif
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#if defined (SIGTTOU)
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signal (SIGTTOU, old_ttou);
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signal (SIGTTIN, old_ttin);
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#endif
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#if defined (SIGWINCH)
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signal (SIGWINCH, old_sigwinch);
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#endif
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}
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/* Move to the start of the current line. */
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static void
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cr ()
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{
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extern char *term_cr;
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if (term_cr)
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tputs (term_cr, 1, _rl_output_character_function);
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}
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#endif /* HANDLE_SIGNALS */
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