Adding upstream version 5.1.upstream/5.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 779 insertions, 0 deletions

diff --git a/lib/readline/signals.c b/lib/readline/signals.c
new file mode 100644
index 0000000..f9174ab
--- /dev/null
+++ b/lib/readline/signals.c
@@ -0,0 +1,779 @@
+/* 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);
+}