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/* Implementation of the SIGNAL and ALARM g77 intrinsics

   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran 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 of the License, or (at your option) any later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

Libgfortran 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 libgfortran; see the file COPYING.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#include "libgfortran.h"

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#include <errno.h>

/* SIGNAL subroutine with PROCEDURE as handler  */

extern void signal_sub (int *, void (*)(int), int *);

iexport_proto(signal_sub);

void

signal_sub (int *number, void (*handler)(int), int *status)

{

#ifdef HAVE_SIGNAL

  if (status != NULL)

    *status = (int) signal (*number, handler);

  else

    signal (*number, handler);

#else

  errno = ENOSYS;

  if (status != NULL)

    *status = -1;

#endif

}

iexport(signal_sub);

/* SIGNAL subroutine with INTEGER as handler  */

extern void signal_sub_int (int *, int *, int *);

iexport_proto(signal_sub_int);

void

signal_sub_int (int *number, int *handler, int *status)

{

#ifdef HAVE_SIGNAL

  if (status != NULL)

    *status = (int) signal (*number, (void (*)(int)) *handler);

  else

    signal (*number, (void (*)(int)) *handler);

#else

  errno = ENOSYS;

  if (status != NULL)

    *status = -1;

#endif

}

iexport(signal_sub_int);

/* SIGNAL function with PROCEDURE as handler  */

extern int signal_func (int *, void (*)(int));

iexport_proto(signal_func);

int

signal_func (int *number, void (*handler)(int))

{

  int status;

  signal_sub (number, handler, &status);

  return status;

}

iexport(signal_func);

/* SIGNAL function with INTEGER as handler  */

extern int signal_func_int (int *, int *);

iexport_proto(signal_func_int);

int

signal_func_int (int *number, int *handler)

{

  int status;

  signal_sub_int (number, handler, &status);

  return status;

}

iexport(signal_func_int);

/* ALARM intrinsic with PROCEDURE as handler  */

extern void alarm_sub (int *, void (*)(int), int *);

iexport_proto(alarm_sub);

void

alarm_sub (int *seconds, void (*handler)(int), int *status)

{

#if defined (SIGALRM) && defined (HAVE_ALARM) && defined (HAVE_SIGNAL)

  if (status != NULL)

    {

      if (signal (SIGALRM, handler) == SIG_ERR)

        *status = -1;

      else

        *status = alarm (*seconds);

    }

  else

    {

      signal (SIGALRM, handler);

      alarm (*seconds);

    }

#else

  errno = ENOSYS;

  if (status != NULL)

    *status = -1;

#endif

}

iexport(alarm_sub);

/* ALARM intrinsic with INTEGER as handler  */

extern void alarm_sub_int (int *, int *, int *);

iexport_proto(alarm_sub_int);

void

alarm_sub_int (int *seconds, int *handler, int *status)

{

#if defined (SIGALRM) && defined (HAVE_ALARM) && defined (HAVE_SIGNAL)

  if (status != NULL)

    {

      if (signal (SIGALRM, (void (*)(int)) handler) == SIG_ERR)

        *status = -1;

      else

        *status = alarm (*seconds);

    }

  else

    {

      signal (SIGALRM, (void (*)(int)) handler);

      alarm (*seconds);

    }

#else

  errno = ENOSYS;

  if (status != NULL)

    *status = -1;

#endif

}

iexport(alarm_sub_int);