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/****************************************************************************

 *                                                                          *

 *                         GNAT COMPILER COMPONENTS                         *

 *                                                                          *

 *                               C T R L _ C                                *

 *                                                                          *

 *                          C Implementation File                           *

 *                                                                          *

 *        Copyright (C) 2002-2009, Free Software Foundation, Inc.           *

 *                                                                          *

 * GNAT is free software;  you can  redistribute it  and/or modify it under *

 * terms of the  GNU General Public License as published  by the Free Soft- *

 * ware  Foundation;  either version 3,  or (at your option) any later ver- *

 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *

 * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *

 * or FITNESS FOR A PARTICULAR PURPOSE.                                     *

 *                                                                          *

 * As a special exception under Section 7 of GPL version 3, you are granted *

 * additional permissions described in the GCC Runtime Library Exception,   *

 * version 3.1, as published by the Free Software Foundation.               *

 *                                                                          *

 * You should have received a copy of the GNU General Public License and    *

 * a copy of the GCC Runtime Library Exception along with this program;     *

 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *

 * <http://www.gnu.org/licenses/>.                                          *

 *                                                                          *

 * GNAT was originally developed  by the GNAT team at  New York University. *

 * Extensive contributions were provided by Ada Core Technologies Inc.      *

 *                                                                          *

 ****************************************************************************/

#ifdef IN_RTS

#include "tconfig.h"

#include "tsystem.h"

#include <sys/stat.h>

#else

#include "config.h"

#include "system.h"

#endif

/* Services to intercept Ctrl-C */

/* __gnat_install_int_handler will install the specified handler.

   If called for the first time, it will also save the original handler */

void __gnat_install_int_handler (void (*) (void));

/* __gnat_uninstall_int_handler will reinstall the original handler */

void __gnat_uninstall_int_handler (void);

/* POSIX implementation */

#if (defined (__unix__) || defined (_AIX) || defined (__APPLE__)) \

 && !defined (__vxworks)

#include <signal.h>

void (*sigint_intercepted) (void) = 0;

struct sigaction original_act;

static void

__gnat_int_handler (int sig __attribute__ ((unused)))

{

  if (sigint_intercepted != 0)

    sigint_intercepted ();

}

/* Install handler and save original handler. */

void

__gnat_install_int_handler (void (*proc) (void))

{

  struct sigaction act;

  if (sigint_intercepted == 0)

    {

      act.sa_handler = __gnat_int_handler;

#if defined (__Lynx__)

      /* LynxOS does not support SA_RESTART. */

      act.sa_flags = 0;

#else

      act.sa_flags = SA_RESTART;

#endif

      sigemptyset (&act.sa_mask);

      sigaction (SIGINT, &act, &original_act);

    }

  sigint_intercepted = proc;

}

/* Restore original handler */

void

__gnat_uninstall_int_handler (void)

{

 if (sigint_intercepted != 0)

   {

     sigaction (SIGINT, &original_act, 0);

     sigint_intercepted = 0;

   }

}

/* Windows implementation */

#elif defined (__MINGW32__)

#include "mingw32.h"

#include <windows.h>

void (*sigint_intercepted) (void) = NULL;

static BOOL WINAPI

__gnat_int_handler  (DWORD dwCtrlType)

{

  switch (dwCtrlType)

    {

    case CTRL_C_EVENT:

    case CTRL_BREAK_EVENT:

      if (sigint_intercepted != 0)

        {

          sigint_intercepted ();

          return TRUE;

        }

      break;

    case CTRL_CLOSE_EVENT:

    case CTRL_LOGOFF_EVENT:

    case CTRL_SHUTDOWN_EVENT:

      break;

    }

  return FALSE;

}

void

__gnat_install_int_handler (void (*proc) (void))

{

  if (sigint_intercepted == NULL)

    SetConsoleCtrlHandler (__gnat_int_handler, TRUE);

  sigint_intercepted = proc;

}

void

__gnat_uninstall_int_handler (void)

{

  if (sigint_intercepted != NULL)

    SetConsoleCtrlHandler (__gnat_int_handler, FALSE);

  sigint_intercepted = NULL;

}

/* Default implementation: do nothing */

#else

void

__gnat_install_int_handler (void (*proc) (void) __attribute__ ((unused)))

{

}

void

__gnat_uninstall_int_handler (void)

{

}

#endif