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
+ as published by the Free Software Foundation; either version 2, or
(at your option) any later version.
The GNU Readline Library is distributed in the hope that it will be
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. */
+ 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#define READLINE_LIBRARY
#if defined (HAVE_CONFIG_H)
# 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 ();
+#include "rlprivate.h"
#if !defined (RETSIGTYPE)
# if defined (VOID_SIGHANDLER)
# define SIGHANDLER_RETURN return (0)
#endif
-/* This typedef is equivalant to the one for Function; it allows us
+/* This typedef is equivalent 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 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;
+typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt;
# define sigemptyset(m)
#endif /* !HAVE_POSIX_SIGNALS */
-static sighandler_cxt old_int, old_alrm;
+static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *));
+
+/* Exported variables for use by applications. */
+
+/* If non-zero, readline will install its own signal handlers for
+ SIGINT, SIGTERM, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
+int rl_catch_signals = 1;
-#if !defined (SHELL)
-static sighandler_cxt old_tstp, old_ttou, old_ttin, old_term;
-#endif /* !SHELL */
+/* If non-zero, readline will install a signal handler for SIGWINCH. */
+#ifdef SIGWINCH
+int rl_catch_sigwinch = 1;
+#endif
+
+static int signals_set_flag;
+static int sigwinch_set_flag;
+/* **************************************************************** */
+/* */
+/* Signal Handling */
+/* */
+/* **************************************************************** */
+
+static sighandler_cxt old_int, old_term, old_alrm, old_quit;
+#if defined (SIGTSTP)
+static sighandler_cxt old_tstp, old_ttou, old_ttin;
+#endif
#if defined (SIGWINCH)
static sighandler_cxt old_winch;
#endif
#else /* !HAVE_POSIX_SIGNALS */
# if defined (HAVE_BSD_SIGNALS)
long omask;
-# endif /* HAVE_BSD_SIGNALS */
+# else /* !HAVE_BSD_SIGNALS */
+ sighandler_cxt dummy_cxt; /* needed for rl_set_sighandler call */
+# endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+
#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, (sighandler_cxt *)NULL);
+ 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 ();
+ rl_free_line_state ();
+ /* FALLTHROUGH */
#if defined (SIGTSTP)
case SIGTSTP:
#endif /* SIGTSTP */
case SIGALRM:
case SIGTERM:
- _rl_clean_up_for_exit ();
- (*rl_deprep_term_function) ();
- rl_clear_signals ();
- rl_pending_input = 0;
+ case SIGQUIT:
+ rl_cleanup_after_signal ();
#if defined (HAVE_POSIX_SIGNALS)
sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#if defined (__EMX__)
+ signal (sig, SIG_ACK);
+#endif
+
kill (getpid (), sig);
/* Let the signal that we just sent through. */
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- (*rl_prep_term_function) (_rl_meta_flag);
- rl_set_signals ();
+ rl_reset_after_signal ();
}
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
SIGHANDLER_RETURN;
}
#if defined (SIGWINCH)
static RETSIGTYPE
-rl_handle_sigwinch (sig)
+rl_sigwinch_handler (sig)
int sig;
{
SigHandler *oh;
- if (readline_echoing_p)
- {
- _rl_get_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
+#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_sigwinch_handler, &dummy_winch);
+#endif
+
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+ rl_resize_terminal ();
/* 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);
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
SIGHANDLER_RETURN;
}
#endif /* SIGWINCH */
SigHandler *handler;
sighandler_cxt *ohandler;
{
+ sighandler_cxt old_handler;
#if defined (HAVE_POSIX_SIGNALS)
struct sigaction act;
act.sa_handler = handler;
- act.sa_flags = 0;
+ act.sa_flags = 0; /* XXX - should we set SA_RESTART for SIGWINCH? */
sigemptyset (&act.sa_mask);
sigemptyset (&ohandler->sa_mask);
- sigaction (sig, &act, ohandler);
+ sigaction (sig, &act, &old_handler);
#else
- ohandler->sa_handler = (SigHandler *)signal (sig, handler);
+ old_handler.sa_handler = (SigHandler *)signal (sig, handler);
#endif /* !HAVE_POSIX_SIGNALS */
+
+ /* XXX -- assume we have memcpy */
+ /* If rl_set_signals is called twice in a row, don't set the old handler to
+ rl_signal_handler, because that would cause infinite recursion. */
+ if (handler != rl_signal_handler || old_handler.sa_handler != rl_signal_handler)
+ memcpy (ohandler, &old_handler, sizeof (sighandler_cxt));
+
return (ohandler->sa_handler);
}
-int
-rl_set_signals ()
+static void
+rl_maybe_set_sighandler (sig, handler, ohandler)
+ int sig;
+ SigHandler *handler;
+ sighandler_cxt *ohandler;
{
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);
+ oh = rl_set_sighandler (sig, handler, ohandler);
if (oh == (SigHandler *)SIG_IGN)
- rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (sig, ohandler, &dummy);
+}
- oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
- if (oh == (SigHandler *)SIG_IGN)
- rl_sigaction (SIGALRM, &old_alrm, &dummy);
+int
+rl_set_signals ()
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+
+ if (rl_catch_signals && signals_set_flag == 0)
+ {
+ rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+ rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
+
+ 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);
+ /* 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 (SHELL)
-
#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;
+ rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
#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);
- }
+ rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
#endif /* SIGTTOU */
- /* Handle SIGTERM if we're not being compiled as part of bash. */
- rl_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
-#endif /* !SHELL */
+#if defined (SIGTTIN)
+ rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 1;
+ }
#if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, rl_handle_sigwinch, &old_winch);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 0)
+ {
+ rl_maybe_set_sighandler (SIGWINCH, rl_sigwinch_handler, &old_winch);
+ sigwinch_set_flag = 1;
+ }
#endif /* SIGWINCH */
return 0;
{
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 (rl_catch_signals && signals_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
-#if !defined (SHELL)
+ rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (SIGTERM, &old_term, &dummy);
+ rl_sigaction (SIGQUIT, &old_quit, &dummy);
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#if defined (SIGTSTP)
- rl_sigaction (SIGTSTP, &old_tstp, &dummy);
-#endif
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+#endif /* SIGTSTP */
#if defined (SIGTTOU)
- rl_sigaction (SIGTTOU, &old_ttou, &dummy);
- rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+ rl_sigaction (SIGTTOU, &old_ttou, &dummy);
#endif /* SIGTTOU */
- rl_sigaction (SIGTERM, &old_term, &dummy);
+#if defined (SIGTTIN)
+ rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+#endif /* SIGTTIN */
-#endif /* !SHELL */
+ signals_set_flag = 0;
+ }
#if defined (SIGWINCH)
- sigemptyset (&dummy.sa_mask);
- rl_sigaction (SIGWINCH, &old_winch, &dummy);
+ if (rl_catch_sigwinch && sigwinch_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
+ rl_sigaction (SIGWINCH, &old_winch, &dummy);
+ sigwinch_set_flag = 0;
+ }
#endif
return 0;
}
+
+/* Clean up the terminal and readline state after catching a signal, before
+ resending it to the calling application. */
+void
+rl_cleanup_after_signal ()
+{
+ _rl_clean_up_for_exit ();
+ (*rl_deprep_term_function) ();
+ rl_clear_signals ();
+ rl_clear_pending_input ();
+}
+
+/* Reset the terminal and readline state after a signal handler returns. */
+void
+rl_reset_after_signal ()
+{
+ (*rl_prep_term_function) (_rl_meta_flag);
+ rl_set_signals ();
+}
+
+/* Free up the readline variable line state for the current line (undo list,
+ any partial history entry, any keyboard macros in progress, and any
+ numeric arguments in process) after catching a signal, before calling
+ rl_cleanup_after_signal(). */
+void
+rl_free_line_state ()
+{
+ register HIST_ENTRY *entry;
+
+ rl_free_undo_list ();
+
+ entry = current_history ();
+ if (entry)
+ entry->data = (char *)NULL;
+
+ _rl_kill_kbd_macro ();
+ rl_clear_message ();
+ _rl_init_argument ();
+}
+
#endif /* HANDLE_SIGNALS */