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/* isatty.c. Implementation of the _isatty syscall for newlib

   Copyright (C) 2004, Jacob Bower

   Copyright (C) 2010, Embecosm Limited <info@embecosm.com>

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Newlib.

   The original work by Jacob Bower is provided as-is without any kind of

   warranty. Use it at your own risk!

   All subsequent work is bound by version 3 of the GPL as follows.

   This program 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 3 of the License, or (at your option)

   any later version.

   This program 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 this program.  If not, see <http:#www.gnu.org/licenses/>.             */

/* -------------------------------------------------------------------------- */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen.                                                              */

/* -------------------------------------------------------------------------- */

#include <errno.h>

#include <unistd.h>

#undef ERRNO

extern int  errno;

/* -------------------------------------------------------------------------- */

/*!Is a file a TTY?

   We only support stdout and stderr to the console, so we are always a TTY

   for these.

   Remember that this function is *not* reentrant, so no static state should

   be held.

   @param[in] file  The fileno to check.

   @return  1 if we are a TTY, 0 otherwise, with an error code in the global

            variable errno.                                                   */

/* -------------------------------------------------------------------------- */

int

_isatty (int   file)

{

  if ((file == STDOUT_FILENO) || (file == STDERR_FILENO))

    {

      return  1;

    }

  else

    {

      errno = EBADF;

      return  -1;

    }

}       /* _isatty () */