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/* 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. */
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#if !defined (NO_SYS_FILE)
# include <sys/file.h>
#endif /* !NO_SYS_FILE */
#include <signal.h>
/* This is needed to include support for TIOCGWINSZ and window resizing. */
#if defined (OSF1) || defined (BSD386) || defined (_386BSD) || defined (__BSD_4_4__) || defined (AIX)
# include <sys/ioctl.h>
#endif /* OSF1 || BSD386 || _386BSD || __BSD_4_4__ || AIX */
#include <errno.h>
/* Not all systems declare ERRNO in errno.h... and some systems #define it! */
#if !defined (errno)
extern int errno;
#endif /* !errno */
/* System-specific feature definitions and include files. */
#include "rldefs.h"
/* Some standard library routines. */
#include "readline.h"
#include "history.h"
static void cr ();
extern int readline_echoing_p;
extern int rl_pending_input;
extern int _rl_meta_flag;
#ifdef __STDC__
extern void _rl_output_character_function (int);
#else
extern void _rl_output_character_function ();
#endif
extern void free_undo_list ();
#if defined (VOID_SIGHANDLER)
# define sighandler void
#else
# define sighandler int
#endif /* VOID_SIGHANDLER */
/* This typedef is equivalant to the one for Function; it allows us
to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
typedef sighandler SigHandler ();
/* **************************************************************** */
/* */
/* Signal Handling */
/* */
/* **************************************************************** */
#if defined (HANDLE_SIGNALS)
#if defined (SIGWINCH)
static SigHandler *old_sigwinch = (SigHandler *)NULL;
static sighandler
rl_handle_sigwinch (sig)
int sig;
{
if (readline_echoing_p)
{
_rl_set_screen_size (fileno (rl_instream), 1);
cr (); /* was crlf () */
rl_forced_update_display ();
}
if (old_sigwinch &&
old_sigwinch != (SigHandler *)SIG_IGN &&
old_sigwinch != (SigHandler *)SIG_DFL)
(*old_sigwinch) (sig);
#if !defined (VOID_SIGHANDLER)
return (0);
#endif /* VOID_SIGHANDLER */
}
#endif /* SIGWINCH */
/* Interrupt handling. */
static SigHandler
*old_int = (SigHandler *)NULL,
*old_tstp = (SigHandler *)NULL,
*old_ttou = (SigHandler *)NULL,
*old_ttin = (SigHandler *)NULL,
*old_cont = (SigHandler *)NULL,
*old_alrm = (SigHandler *)NULL;
/* Handle an interrupt character. */
static sighandler
rl_signal_handler (sig)
int sig;
{
#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)
signal (sig, SIG_IGN);
#endif /* !HAVE_BSD_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:
rl_clean_up_for_exit ();
rl_deprep_terminal ();
rl_clear_signals ();
rl_pending_input = 0;
kill (getpid (), sig);
SIGNALS_UNBLOCK;
rl_prep_terminal (_rl_meta_flag);
rl_set_signals ();
}
#if !defined (VOID_SIGHANDLER)
return (0);
#endif /* !VOID_SIGHANDLER */
}
#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)
signal (SIGINT, SIG_IGN);
old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
if (old_alrm == (SigHandler *)SIG_IGN)
signal (SIGALRM, SIG_IGN);
#if defined (SIGTSTP)
old_tstp = (SigHandler *)rl_set_sighandler (SIGTSTP, rl_signal_handler);
if (old_tstp == (SigHandler *)SIG_IGN)
signal (SIGTSTP, SIG_IGN);
#endif
#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)
{
signal (SIGTTOU, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
}
#endif
#if defined (SIGWINCH)
old_sigwinch =
(SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
#endif
}
rl_clear_signals ()
{
rl_set_sighandler (SIGINT, old_int);
rl_set_sighandler (SIGALRM, old_alrm);
#if defined (SIGTSTP)
signal (SIGTSTP, old_tstp);
#endif
#if defined (SIGTTOU)
signal (SIGTTOU, old_ttou);
signal (SIGTTIN, old_ttin);
#endif
#if defined (SIGWINCH)
signal (SIGWINCH, old_sigwinch);
#endif
}
/* Move to the start of the current line. */
static void
cr ()
{
extern char *term_cr;
if (term_cr)
tputs (term_cr, 1, _rl_output_character_function);
}
#endif /* HANDLE_SIGNALS */
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