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-rw-r--r--signals.c779
1 files changed, 779 insertions, 0 deletions
diff --git a/signals.c b/signals.c
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+++ b/signals.c
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+/* signals.c -- signal handling support for readline. */
+
+/* Copyright (C) 1987-2017 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
+
+ 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.
+
+ 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.
+
+ 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
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <stdio.h> /* Just for NULL. Yuck. */
+#include <sys/types.h>
+#include <signal.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_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"
+
+#include "rlprivate.h"
+
+#if defined (HANDLE_SIGNALS)
+
+#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_RETURN return
+#else
+# define SIGHANDLER_RETURN return (0)
+#endif
+
+/* This typedef is equivalent to the one for Function; it allows us
+ to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */
+typedef RETSIGTYPE SigHandler ();
+
+#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 *));
+static void rl_maybe_restore_sighandler PARAMS((int, sighandler_cxt *));
+
+static RETSIGTYPE rl_signal_handler PARAMS((int));
+static RETSIGTYPE _rl_handle_signal PARAMS((int));
+
+/* Exported variables for use by applications. */
+
+/* If non-zero, readline will install its own signal handlers for
+ SIGINT, SIGTERM, SIGHUP, SIGQUIT, SIGALRM, SIGTSTP, SIGTTIN, and SIGTTOU. */
+int rl_catch_signals = 1;
+
+/* If non-zero, readline will install a signal handler for SIGWINCH. */
+#ifdef SIGWINCH
+int rl_catch_sigwinch = 1;
+#else
+int rl_catch_sigwinch = 0; /* for the readline state struct in readline.c */
+#endif
+
+/* Private variables. */
+int volatile _rl_caught_signal = 0; /* should be sig_atomic_t, but that requires including <signal.h> everywhere */
+
+/* If non-zero, print characters corresponding to received signals as long as
+ the user has indicated his desire to do so (_rl_echo_control_chars). */
+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;
+
+#if defined (HAVE_POSIX_SIGNALS)
+sigset_t _rl_orig_sigset;
+#endif /* !HAVE_POSIX_SIGNALS */
+
+/* **************************************************************** */
+/* */
+/* Signal Handling */
+/* */
+/* **************************************************************** */
+
+static sighandler_cxt old_int, old_term, old_hup, 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
+
+_rl_sigcleanup_func_t *_rl_sigcleanup;
+void *_rl_sigcleanarg;
+
+/* Readline signal handler functions. */
+
+/* Called from RL_CHECK_SIGNALS() macro to run signal handling code. */
+RETSIGTYPE
+_rl_signal_handler (int sig)
+{
+ _rl_caught_signal = 0; /* XXX */
+
+#if defined (SIGWINCH)
+ if (sig == SIGWINCH)
+ {
+ RL_SETSTATE(RL_STATE_SIGHANDLER);
+
+ rl_resize_terminal ();
+ /* XXX - experimental for now */
+ /* Call a signal hook because though we called the original signal handler
+ in rl_sigwinch_handler below, we will not resend the signal to
+ ourselves. */
+ if (rl_signal_event_hook)
+ (*rl_signal_event_hook) ();
+
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+ }
+ else
+#endif
+ _rl_handle_signal (sig);
+
+ SIGHANDLER_RETURN;
+}
+
+static RETSIGTYPE
+rl_signal_handler (int sig)
+{
+ _rl_caught_signal = sig;
+ SIGHANDLER_RETURN;
+}
+
+/* This is called to handle a signal when it is safe to do so (out of the
+ signal handler execution path). Called by _rl_signal_handler for all the
+ signals readline catches except SIGWINCH. */
+static RETSIGTYPE
+_rl_handle_signal (int sig)
+{
+ int block_sig;
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigset_t set, oset;
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+ long omask;
+# 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)
+# endif
+ rl_set_sighandler (sig, SIG_IGN, &dummy_cxt);
+#endif /* !HAVE_BSD_SIGNALS && !HAVE_POSIX_SIGNALS */
+
+ /* If there's a sig cleanup function registered, call it and `deregister'
+ the cleanup function to avoid multiple calls */
+ if (_rl_sigcleanup)
+ {
+ (*_rl_sigcleanup) (sig, _rl_sigcleanarg);
+ _rl_sigcleanup = 0;
+ _rl_sigcleanarg = 0;
+ }
+
+#if defined (HAVE_POSIX_SIGNALS)
+ /* Get the current set of blocked signals. If we want to block a signal for
+ the duration of the cleanup functions, make sure to add it to SET and
+ set block_sig = 1 (see the SIGHUP case below). */
+ block_sig = 0; /* sentinel to block signals with sigprocmask */
+ sigemptyset (&set);
+ sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &set);
+#endif
+
+ switch (sig)
+ {
+ case SIGINT:
+ _rl_reset_completion_state ();
+ rl_free_line_state ();
+#if defined (READLINE_CALLBACKS)
+ rl_callback_sigcleanup ();
+#endif
+
+ /* FALLTHROUGH */
+
+#if defined (SIGTSTP)
+ case SIGTSTP:
+ case SIGTTIN:
+ case SIGTTOU:
+# if defined (HAVE_POSIX_SIGNALS)
+ /* Block SIGTTOU so we can restore the terminal settings to something
+ sane without stopping on SIGTTOU if we have been placed into the
+ background. Even trying to get the current terminal pgrp with
+ tcgetpgrp() will generate SIGTTOU, so we don't bother. We still do
+ this even if we've been stopped on SIGTTOU, since we handle signals
+ when we have returned from the signal handler and the signal is no
+ longer blocked. */
+ sigaddset (&set, SIGTTOU);
+ block_sig = 1;
+# endif
+#endif /* SIGTSTP */
+ /* Any signals that should be blocked during cleanup should go here. */
+#if defined (SIGHUP)
+ case SIGHUP:
+# if defined (_AIX)
+ if (block_sig == 0)
+ {
+ sigaddset (&set, sig);
+ block_sig = 1;
+ }
+# endif // _AIX
+#endif
+ /* Signals that don't require blocking during cleanup should go here. */
+ case SIGTERM:
+#if defined (SIGALRM)
+ case SIGALRM:
+#endif
+#if defined (SIGQUIT)
+ case SIGQUIT:
+#endif
+
+ if (block_sig)
+ sigprocmask (SIG_BLOCK, &set, &oset);
+
+ rl_echo_signal_char (sig);
+ rl_cleanup_after_signal ();
+
+ /* At this point, the application's signal handler, if any, is the
+ current handler. */
+
+#if defined (HAVE_POSIX_SIGNALS)
+ /* Unblock any signal(s) blocked above */
+ if (block_sig)
+ sigprocmask (SIG_UNBLOCK, &oset, (sigset_t *)NULL);
+#endif
+
+ /* We don't have to bother unblocking the signal because we are not
+ running in a signal handler context. */
+#if 0
+#if defined (HAVE_POSIX_SIGNALS)
+ /* Make sure this signal is not blocked when we resend it to the
+ calling application. */
+ sigemptyset (&set);
+ 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 */
+#endif
+
+#if defined (__EMX__)
+ signal (sig, SIG_ACK);
+#endif
+
+#if defined (HAVE_KILL)
+ kill (getpid (), sig);
+#else
+ raise (sig); /* assume we have raise */
+#endif
+
+ /* We don't need to modify the signal mask now that this is not run in
+ a signal handler context. */
+#if 0
+ /* Let the signal that we just sent through if it is blocked. */
+#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 */
+#endif
+
+ rl_reset_after_signal ();
+ }
+
+ RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+ SIGHANDLER_RETURN;
+}
+
+#if defined (SIGWINCH)
+static RETSIGTYPE
+rl_sigwinch_handler (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_caught_signal = sig;
+
+ /* 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 (int sig, sighandler_cxt *nh, sighandler_cxt *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 (int sig, SigHandler *handler, sighandler_cxt *ohandler)
+{
+ 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 (&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);
+}
+
+/* Set disposition of SIG to HANDLER, returning old state in OHANDLER. Don't
+ change disposition if OHANDLER indicates the signal was ignored. */
+static void
+rl_maybe_set_sighandler (int sig, SigHandler *handler, sighandler_cxt *ohandler)
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+
+ sigemptyset (&dummy.sa_mask);
+ dummy.sa_flags = 0;
+ oh = rl_set_sighandler (sig, handler, ohandler);
+ if (oh == (SigHandler *)SIG_IGN)
+ rl_sigaction (sig, ohandler, &dummy);
+}
+
+/* Set the disposition of SIG to HANDLER, if HANDLER->sa_handler indicates the
+ signal was not being ignored. MUST only be called for signals whose
+ disposition was changed using rl_maybe_set_sighandler or for which the
+ SIG_IGN check was performed inline (e.g., SIGALRM below). */
+static void
+rl_maybe_restore_sighandler (int sig, sighandler_cxt *handler)
+{
+ sighandler_cxt dummy;
+
+ sigemptyset (&dummy.sa_mask);
+ dummy.sa_flags = 0;
+ if (handler->sa_handler != SIG_IGN)
+ rl_sigaction (sig, handler, &dummy);
+}
+
+int
+rl_set_signals (void)
+{
+ sighandler_cxt dummy;
+ SigHandler *oh;
+#if defined (HAVE_POSIX_SIGNALS)
+ static int sigmask_set = 0;
+ static sigset_t bset, oset;
+#endif
+
+#if defined (HAVE_POSIX_SIGNALS)
+ if (rl_catch_signals && sigmask_set == 0)
+ {
+ sigemptyset (&bset);
+
+ sigaddset (&bset, SIGINT);
+ sigaddset (&bset, SIGTERM);
+#if defined (SIGHUP)
+ sigaddset (&bset, SIGHUP);
+#endif
+#if defined (SIGQUIT)
+ sigaddset (&bset, SIGQUIT);
+#endif
+#if defined (SIGALRM)
+ sigaddset (&bset, SIGALRM);
+#endif
+#if defined (SIGTSTP)
+ sigaddset (&bset, SIGTSTP);
+#endif
+#if defined (SIGTTIN)
+ sigaddset (&bset, SIGTTIN);
+#endif
+#if defined (SIGTTOU)
+ sigaddset (&bset, SIGTTOU);
+#endif
+ sigmask_set = 1;
+ }
+#endif /* HAVE_POSIX_SIGNALS */
+
+ if (rl_catch_signals && signals_set_flag == 0)
+ {
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&_rl_orig_sigset);
+ sigprocmask (SIG_BLOCK, &bset, &_rl_orig_sigset);
+#endif
+
+ rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
+ rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
+#if defined (SIGHUP)
+ rl_maybe_set_sighandler (SIGHUP, rl_signal_handler, &old_hup);
+#endif
+#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 */
+
+#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, &_rl_orig_sigset, (sigset_t *)NULL);
+#endif
+ }
+ else if (rl_catch_signals == 0)
+ {
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&_rl_orig_sigset);
+ sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &_rl_orig_sigset);
+#endif
+ }
+
+#if defined (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 (void)
+{
+ sighandler_cxt dummy;
+
+ if (rl_catch_signals && signals_set_flag == 1)
+ {
+ /* Since rl_maybe_set_sighandler doesn't override a SIG_IGN handler,
+ we should in theory not have to restore a handler where
+ old_xxx.sa_handler == SIG_IGN. That's what rl_maybe_restore_sighandler
+ does. Fewer system calls should reduce readline's per-line
+ overhead */
+ rl_maybe_restore_sighandler (SIGINT, &old_int);
+ rl_maybe_restore_sighandler (SIGTERM, &old_term);
+#if defined (SIGHUP)
+ rl_maybe_restore_sighandler (SIGHUP, &old_hup);
+#endif
+#if defined (SIGQUIT)
+ rl_maybe_restore_sighandler (SIGQUIT, &old_quit);
+#endif
+#if defined (SIGALRM)
+ rl_maybe_restore_sighandler (SIGALRM, &old_alrm);
+#endif
+
+#if defined (SIGTSTP)
+ rl_maybe_restore_sighandler (SIGTSTP, &old_tstp);
+#endif /* SIGTSTP */
+
+#if defined (SIGTTOU)
+ rl_maybe_restore_sighandler (SIGTTOU, &old_ttou);
+#endif /* SIGTTOU */
+
+#if defined (SIGTTIN)
+ rl_maybe_restore_sighandler (SIGTTIN, &old_ttin);
+#endif /* SIGTTIN */
+
+ signals_set_flag = 0;
+ }
+
+#if defined (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 (void)
+{
+ _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 (void)
+{
+ 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 (void)
+{
+ 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 ();
+}
+
+int
+rl_pending_signal (void)
+{
+ return (_rl_caught_signal);
+}
+
+void
+rl_check_signals (void)
+{
+ RL_CHECK_SIGNALS ();
+}
+#endif /* HANDLE_SIGNALS */
+
+/* **************************************************************** */
+/* */
+/* SIGINT Management */
+/* */
+/* **************************************************************** */
+
+#if defined (HAVE_POSIX_SIGNALS)
+static sigset_t sigint_set, sigint_oset;
+static sigset_t sigwinch_set, sigwinch_oset;
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+static int sigint_oldmask;
+static int sigwinch_oldmask;
+# endif /* HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+static int sigint_blocked;
+static int sigwinch_blocked;
+
+/* Cause SIGINT to not be delivered until the corresponding call to
+ release_sigint(). */
+void
+_rl_block_sigint (void)
+{
+ if (sigint_blocked)
+ return;
+
+ sigint_blocked = 1;
+}
+
+/* Allow SIGINT to be delivered. */
+void
+_rl_release_sigint (void)
+{
+ if (sigint_blocked == 0)
+ return;
+
+ sigint_blocked = 0;
+ RL_CHECK_SIGNALS ();
+}
+
+/* Cause SIGWINCH to not be delivered until the corresponding call to
+ release_sigwinch(). */
+void
+_rl_block_sigwinch (void)
+{
+ if (sigwinch_blocked)
+ return;
+
+#if defined (SIGWINCH)
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigemptyset (&sigwinch_set);
+ sigemptyset (&sigwinch_oset);
+ sigaddset (&sigwinch_set, SIGWINCH);
+ sigprocmask (SIG_BLOCK, &sigwinch_set, &sigwinch_oset);
+#else /* !HAVE_POSIX_SIGNALS */
+# if defined (HAVE_BSD_SIGNALS)
+ sigwinch_oldmask = sigblock (sigmask (SIGWINCH));
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sighold (SIGWINCH);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+#endif /* SIGWINCH */
+
+ sigwinch_blocked = 1;
+}
+
+/* Allow SIGWINCH to be delivered. */
+void
+_rl_release_sigwinch (void)
+{
+ if (sigwinch_blocked == 0)
+ return;
+
+#if defined (SIGWINCH)
+
+#if defined (HAVE_POSIX_SIGNALS)
+ sigprocmask (SIG_SETMASK, &sigwinch_oset, (sigset_t *)NULL);
+#else
+# if defined (HAVE_BSD_SIGNALS)
+ sigsetmask (sigwinch_oldmask);
+# else /* !HAVE_BSD_SIGNALS */
+# if defined (HAVE_USG_SIGHOLD)
+ sigrelse (SIGWINCH);
+# endif /* HAVE_USG_SIGHOLD */
+# endif /* !HAVE_BSD_SIGNALS */
+#endif /* !HAVE_POSIX_SIGNALS */
+
+#endif /* SIGWINCH */
+
+ sigwinch_blocked = 0;
+}
+
+/* **************************************************************** */
+/* */
+/* Echoing special control characters */
+/* */
+/* **************************************************************** */
+void
+rl_echo_signal_char (int sig)
+{
+ char cstr[3];
+ int cslen, c;
+
+ if (_rl_echoctl == 0 || _rl_echo_control_chars == 0)
+ return;
+
+ switch (sig)
+ {
+ case SIGINT: c = _rl_intr_char; break;
+#if defined (SIGQUIT)
+ case SIGQUIT: c = _rl_quit_char; break;
+#endif
+#if defined (SIGTSTP)
+ case SIGTSTP: c = _rl_susp_char; break;
+#endif
+ 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);
+}