/* signals.c -- signal handling support for readline. */
-/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2009 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.
+ This file is part of the GNU Readline Library (Readline), 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
+ Readline 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 3 of the License, 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
+ Readline 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. */
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
#define READLINE_LIBRARY
-#include <stdio.h>
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <stdio.h> /* Just for NULL. Yuck. */
#include <sys/types.h>
-#include <fcntl.h>
-#if !defined (NO_SYS_FILE)
-# include <sys/file.h>
-#endif /* !NO_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"
#include "readline.h"
#include "history.h"
-extern int readline_echoing_p;
-extern int rl_pending_input;
-extern int _rl_meta_flag;
+#include "rlprivate.h"
+
+#if defined (HANDLE_SIGNALS)
-extern void free_undo_list ();
+#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 void
+# define SIGHANDLER_RETURN return
#else
-# define sighandler int
-#endif /* 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 sighandler SigHandler ();
+typedef RETSIGTYPE SigHandler ();
-#if defined (__GO32__)
-# undef HANDLE_SIGNALS
-#endif /* __GO32__ */
+#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; int sa_mask, sa_flags; } sighandler_cxt;
+# define sigemptyset(m)
+#endif /* !HAVE_POSIX_SIGNALS */
+
+#ifndef SA_RESTART
+# define SA_RESTART 0
+#endif
+
+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 (STATIC_MALLOC)
-static char *xmalloc (), *xrealloc ();
+/* If non-zero, readline will install a signal handler for SIGWINCH. */
+#ifdef SIGWINCH
+int rl_catch_sigwinch = 1;
#else
-extern char *xmalloc (), *xrealloc ();
-#endif /* STATIC_MALLOC */
+int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */
+#endif
+
+/* Private variables. */
+/* If non-zero, print characters corresponding to received signals. */
+int _rl_echoctl = 0;
+
+int _rl_intr_char = 0;
+int _rl_quit_char = 0;
+int _rl_susp_char = 0;
+
+static int signals_set_flag;
+static int sigwinch_set_flag;
-\f
/* **************************************************************** */
/* */
/* 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 *old_sigwinch = (SigHandler *)NULL;
-
-static sighandler
-rl_handle_sigwinch (sig)
- int sig;
-{
- if (readline_echoing_p)
- {
- _rl_set_screen_size (fileno (rl_instream), 1);
- _rl_redisplay_after_sigwinch ();
- }
+static sighandler_cxt old_winch;
+#endif
- 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 */
+/* Readline signal handler functions. */
-#if defined (HANDLE_SIGNALS)
-/* Interrupt handling. */
-static SigHandler
- *old_int = (SigHandler *)NULL,
- *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 sighandler
+static RETSIGTYPE
rl_signal_handler (sig)
int sig;
{
#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 defined (SIGALRM)
+ if (sig == SIGINT || sig == SIGALRM)
+# else
if (sig == SIGINT)
- signal (sig, SIG_IGN);
-#endif /* !HAVE_BSD_SIGNALS */
+# endif
+ 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_reset_completion_state ();
+ rl_free_line_state ();
+ /* FALLTHROUGH */
+ case SIGTERM:
#if defined (SIGTSTP)
case SIGTSTP:
case SIGTTOU:
case SIGTTIN:
#endif /* SIGTSTP */
+#if defined (SIGALRM)
case SIGALRM:
- rl_clean_up_for_exit ();
- rl_deprep_terminal ();
- rl_clear_signals ();
- rl_pending_input = 0;
+#endif
+#if defined (SIGQUIT)
+ case SIGQUIT:
+#endif
+ rl_echo_signal_char (sig);
+ rl_cleanup_after_signal ();
#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&set);
sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
sigdelset (&set, sig);
#else /* !HAVE_POSIX_SIGNALS */
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
+#if defined (__EMX__)
+ signal (sig, SIG_ACK);
+#endif
+
+#if defined (HAVE_KILL)
kill (getpid (), sig);
+#else
+ raise (sig); /* assume we have raise */
+#endif
/* Let the signal that we just sent through. */
#if defined (HAVE_POSIX_SIGNALS)
# endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
- rl_prep_terminal (_rl_meta_flag);
- rl_set_signals ();
+ rl_reset_after_signal ();
}
-#if !defined (VOID_SIGHANDLER)
- return (0);
-#endif /* !VOID_SIGHANDLER */
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+ SIGHANDLER_RETURN;
}
-#if defined (HAVE_POSIX_SIGNALS)
+#if defined (SIGWINCH)
+static RETSIGTYPE
+rl_sigwinch_handler (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_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 */
+
+/* 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)
+rl_set_sighandler (sig, handler, ohandler)
int sig;
SigHandler *handler;
+ sighandler_cxt *ohandler;
{
- struct sigaction act, oact;
+ sighandler_cxt old_handler;
+#if defined (HAVE_POSIX_SIGNALS)
+ struct sigaction act;
act.sa_handler = handler;
+# if defined (SIGWINCH)
+ act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
+# else
act.sa_flags = 0;
+# endif /* SIGWINCH */
sigemptyset (&act.sa_mask);
- sigemptyset (&oact.sa_mask);
- sigaction (sig, &act, &oact);
- return (oact.sa_handler);
+ sigemptyset (&ohandler->sa_mask);
+ sigaction (sig, &act, &old_handler);
+#else
+ 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);
}
-#else /* !HAVE_POSIX_SIGNALS */
-# define rl_set_sighandler(sig, handler) (SigHandler *)signal (sig, handler)
-#endif /* !HAVE_POSIX_SIGNALS */
+static void
+rl_maybe_set_sighandler (sig, handler, ohandler)
+ int sig;
+ SigHandler *handler;
+ sighandler_cxt *ohandler;
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+ sigemptyset (&dummy.sa_mask);
+ oh = rl_set_sighandler (sig, handler, ohandler);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (sig, ohandler, &dummy);
+}
+
+int
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);
-
- old_alrm = (SigHandler *)rl_set_sighandler (SIGALRM, rl_signal_handler);
- if (old_alrm == (SigHandler *)SIG_IGN)
- rl_set_sighandler (SIGALRM, SIG_IGN);
+ sighandler_cxt dummy;
+ SigHandler *oh;
+#if defined (HAVE_POSIX_SIGNALS)
+ static int sigmask_set = 0;
+ static sigset_t bset, oset;
+#endif
-#if !defined (SHELL)
+#if defined (HAVE_POSIX_SIGNALS)
+ if (rl_catch_signals && sigmask_set == 0)
+ {
+ sigemptyset (&bset);
+ sigaddset (&bset, SIGINT);
+ sigaddset (&bset, SIGTERM);
+#if defined (SIGQUIT)
+ sigaddset (&bset, SIGQUIT);
+#endif
+#if defined (SIGALRM)
+ sigaddset (&bset, SIGALRM);
+#endif
#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 */
+ sigaddset (&bset, SIGTSTP);
+#endif
+#if defined (SIGTTIN)
+ sigaddset (&bset, SIGTTIN);
+#endif
#if defined (SIGTTOU)
- old_ttou = (SigHandler *)rl_set_sighandler (SIGTTOU, rl_signal_handler);
- old_ttin = (SigHandler *)rl_set_sighandler (SIGTTIN, rl_signal_handler);
+ sigaddset (&bset, SIGTTOU);
+#endif
+ sigmask_set = 1;
+ }
+#endif /* HAVE_POSIX_SIGNALS */
- if (old_tstp == (SigHandler *)SIG_IGN)
+ if (rl_catch_signals && signals_set_flag == 0)
{
- rl_set_sighandler (SIGTTOU, SIG_IGN);
- rl_set_sighandler (SIGTTIN, SIG_IGN);
- }
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&oset);
+ sigprocmask (SIG_BLOCK, &bset, &oset);
+#endif
+
+ rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+#if defined (SIGQUIT)
+ rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
+#endif
+
+#if defined (SIGALRM)
+ 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 */
+#endif /* SIGALRM */
+
+#if defined (SIGTSTP)
+ rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
+#endif /* SIGTSTP */
+
+#if defined (SIGTTOU)
+ rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
#endif /* SIGTTOU */
-#endif /* !SHELL */
+#if defined (SIGTTIN)
+ rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 1;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
+#endif
+ }
#if defined (SIGWINCH)
- old_sigwinch =
- (SigHandler *) rl_set_sighandler (SIGWINCH, rl_handle_sigwinch);
+ 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;
}
+int
rl_clear_signals ()
{
- rl_set_sighandler (SIGINT, old_int);
- rl_set_sighandler (SIGALRM, old_alrm);
+ sighandler_cxt dummy;
-#if !defined (SHELL)
+ if (rl_catch_signals && signals_set_flag == 1)
+ {
+ sigemptyset (&dummy.sa_mask);
-#if defined (SIGTSTP)
- rl_set_sighandler (SIGTSTP, old_tstp);
+ rl_sigaction (SIGINT, &old_int, &dummy);
+ rl_sigaction (SIGTERM, &old_term, &dummy);
+#if defined (SIGQUIT)
+ rl_sigaction (SIGQUIT, &old_quit, &dummy);
+#endif
+#if defined (SIGALRM)
+ rl_sigaction (SIGALRM, &old_alrm, &dummy);
#endif
+#if defined (SIGTSTP)
+ rl_sigaction (SIGTSTP, &old_tstp, &dummy);
+#endif /* SIGTSTP */
+
#if defined (SIGTTOU)
- rl_set_sighandler (SIGTTOU, old_ttou);
- rl_set_sighandler (SIGTTIN, old_ttin);
+ rl_sigaction (SIGTTOU, &old_ttou, &dummy);
#endif /* SIGTTOU */
-#endif /* !SHELL */
+#if defined (SIGTTIN)
+ rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 0;
+ }
#if defined (SIGWINCH)
- rl_set_sighandler (SIGWINCH, old_sigwinch);
+ 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 ();
+ if (rl_deprep_term_function)
+ (*rl_deprep_term_function) ();
+ rl_clear_pending_input ();
+ rl_clear_signals ();
+}
+
+/* Reset the terminal and readline state after a signal handler returns. */
+void
+rl_reset_after_signal ()
+{
+ if (rl_prep_term_function)
+ (*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_reset_argument ();
+}
+
#endif /* HANDLE_SIGNALS */
+
+/* **************************************************************** */
+/* */
+/* SIGINT Management */
+/* */
+/* **************************************************************** */
+
+#if defined (HAVE_POSIX_SIGNALS)
+static sigset_t sigint_set, sigint_oset;
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+static int sigint_oldmask;
+# endif /* HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+static int sigint_blocked;
+
+/* Cause SIGINT to not be delivered until the corresponding call to
+ release_sigint(). */
+void
+_rl_block_sigint ()
+{
+ if (sigint_blocked)
+ return;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&sigint_set);
+ sigemptyset (&sigint_oset);
+ sigaddset (&sigint_set, SIGINT);
+ sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+ sigint_oldmask = sigblock (sigmask (SIGINT));
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sighold (SIGINT);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+ sigint_blocked = 1;
+}
+
+/* Allow SIGINT to be delivered. */
+void
+_rl_release_sigint ()
+{
+ if (sigint_blocked == 0)
+ return;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
+#else
+# if defined (HAVE_BSD_SIGNALS)
+ sigsetmask (sigint_oldmask);
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sigrelse (SIGINT);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+ sigint_blocked = 0;
+}
+
+/* **************************************************************** */
+/* */
+/* Echoing special control characters */
+/* */
+/* **************************************************************** */
+void
+rl_echo_signal_char (sig)
+ int sig;
+{
+ char cstr[3];
+ int cslen, c;
+
+ if (_rl_echoctl == 0)
+ return;
+
+ switch (sig)
+ {
+ case SIGINT: c = _rl_intr_char; break;
+ case SIGQUIT: c = _rl_quit_char; break;
+ case SIGTSTP: c = _rl_susp_char; break;
+ default: return;
+ }
+
+ if (CTRL_CHAR (c) || c == RUBOUT)
+ {
+ cstr[0] = '^';
+ cstr[1] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
+ cstr[cslen = 2] = '\0';
+ }
+ else
+ {
+ cstr[0] = c;
+ cstr[cslen = 1] = '\0';
+ }
+
+ _rl_output_some_chars (cstr, cslen);
+}