/*

Copyright (C) 2002 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 <cstring>

#include <new>

// Include signal.h, not csignal since the latter might only define
// the ANSI standard C signal interface.

#include <signal.h>

#include "quit.h"

octave_jmp_buf current_context;

void
octave_save_current_context (void *save_buf)
{
  std::memcpy (save_buf, current_context, sizeof (octave_jmp_buf));
}

void
octave_restore_current_context (void *save_buf)
{
  std::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;

void
octave_throw_interrupt_exception (void)
{
  throw octave_interrupt_exception ();
}

void
octave_throw_bad_alloc (void)
{
  throw std::bad_alloc ();
}

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
