initial import from bash_3.1dfsg.orig.tar.gz

1 files changed, 426 insertions, 0 deletions

diff --git a/lib/readline/signals.c b/lib/readline/signals.c
new file mode 100644
index 0000000..f344ed8
--- /dev/null
+++ b/lib/readline/signals.c
@@ -0,0 +1,426 @@
+/* signals.c -- signal handling support for readline. */
+
+/* Copyright (C) 1987-2005 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 2, 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,
+   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+#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 */
+
+#if defined (HANDLE_SIGNALS)
+/* Some standard library routines. */
+#include "readline.h"
+#include "history.h"
+
+#include "rlprivate.h"
+
+#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 *));
+
+/* 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 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
+
+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
+
+/* Readline signal handler functions. */
+
+static RETSIGTYPE
+rl_signal_handler (sig)
+     int sig;
+{
+#if defined (HAVE_POSIX_SIGNALS)
+  sigset_t set;
+#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 */
+
+  switch (sig)
+    {
+    case SIGINT:
+      rl_free_line_state ();
+      /* FALLTHROUGH */
+
+    case SIGTERM:
+#if defined (SIGTSTP)
+    case SIGTSTP:
+    case SIGTTOU:
+    case SIGTTIN:
+#endif /* SIGTSTP */
+#if defined (SIGALRM)
+    case SIGALRM:
+#endif
+#if defined (SIGQUIT)
+    case SIGQUIT:
+#endif
+      rl_cleanup_after_signal ();
+
+#if defined (HAVE_POSIX_SIGNALS)
+      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 */
+
+#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)
+      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 */
+
+      rl_reset_after_signal ();
+    }
+
+  RL_UNSETSTATE(RL_STATE_SIGHANDLER);
+  SIGHANDLER_RETURN;
+}
+
+#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, ohandler)
+     int sig;
+     SigHandler *handler;
+     sighandler_cxt *ohandler;
+{
+  sighandler_cxt old_handler;
+#if defined (HAVE_POSIX_SIGNALS)
+  struct sigaction act;
+
+  act.sa_handler = handler;
+  act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
+  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);
+}
+
+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 ()
+{
+  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);
+#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 (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 ()
+{
+  sighandler_cxt dummy;
+
+  if (rl_catch_signals && signals_set_flag == 1)
+    {
+      sigemptyset (&dummy.sa_mask);
+
+      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_sigaction (SIGTTOU, &old_ttou, &dummy);
+#endif /* SIGTTOU */
+
+#if defined (SIGTTIN)
+      rl_sigaction (SIGTTIN, &old_ttin, &dummy);
+#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 ()
+{
+  _rl_clean_up_for_exit ();
+  if (rl_deprep_term_function)
+    (*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 ()
+{
+  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 */