--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libcruft/misc/cquit.c	Thu Oct 30 16:48:09 2003 +0000
@@ -0,0 +1,94 @@
+/*
+
+Copyright (C) 2003 John W. Eaton
+
+This file is part of Octave.
+
+Octave 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.
+
+Octave 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 Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <signal.h>
+#include <string.h>
+
+#include "quit.h"
+
+octave_jmp_buf current_context;
+
+void
+octave_save_current_context (void *save_buf)
+{
+  memcpy (save_buf, current_context, sizeof (octave_jmp_buf));
+}
+
+void
+octave_restore_current_context (void *save_buf)
+{
+  memcpy (current_context, save_buf, sizeof (octave_jmp_buf));
+}
+
+void
+octave_jump_to_enclosing_context (void)
+{
+#if defined (OCTAVE_HAVE_SIG_JUMP)
+  siglongjmp (current_context, 1);
+#else
+  longjmp (current_context, 1);
+#endif
+}
+
+// Allow us to save the signal mask and then restore it to the most
+// recently saved value.  This is necessary when using the POSIX
+// signal handling interface on some systems calling longjmp out of
+// the signal handler to get to the top level on an interrupt doesn't
+// restore the original signal mask.  Alternatively, we could use
+// sigsetjmp/siglongjmp, but saving and restoring the signal mask
+// ourselves works ok and seems simpler just now.
+
+#if defined (HAVE_POSIX_SIGNALS)
+static sigset_t octave_signal_mask;
+#endif
+
+void
+octave_save_signal_mask (void)
+{
+#if defined (HAVE_POSIX_SIGNALS)
+  sigprocmask (0, 0, &octave_signal_mask);
+#endif
+}
+
+void
+octave_restore_signal_mask (void)
+{
+#if defined (HAVE_POSIX_SIGNALS)
+  sigprocmask (SIG_SETMASK, &octave_signal_mask, 0);
+#endif
+}
+
+sig_atomic_t octave_interrupt_immediately = 0;
+
+sig_atomic_t octave_interrupt_state = 0;
+
+sig_atomic_t octave_allocation_error = 0;
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/