/* Unix pipe-to-self. This is a utility module for tests, not a test.

 *

 * Copyright © 2008-2010 Red Hat, Inc.

 * Copyright © 2011 Nokia Corporation

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General

 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.

 *

 * Author: Simon McVittie <simon.mcvittie@collabora.co.uk>

 */

#include <errno.h>

#include <unistd.h>

#include <gio/gio.h>

#include "test-io-stream.h"

#include "test-pipe-unix.h"

#ifdef G_OS_UNIX

#   include <gio/gunixinputstream.h>

#   include <gio/gunixoutputstream.h>

#else

#   error This module only exists on Unix

#endif

/**

 * test_pipe:

 * @is: (out) (optional): used to return a #GInputStream

 * @os: (out) (optional): used to return a #GOutputStream

 * @error: used to raise an error

 *

 * Return a "pipe to self" connecting @is to @os. This can be used

 * as a unidirectional pipe to or from a child process, for instance.

 *

 * See test_bidi_pipe() if you want to emulate a bidirectional pipe

 * via a pair of unidirectional pipes.

 *

 * Returns: %TRUE on success

 */

gboolean

test_pipe (GInputStream  **is,

           GOutputStream **os,

           GError        **error)

{

  int pipefd[2];

  int ret;

  ret = pipe (pipefd);

  if (ret != 0)

    {

      int e = errno;

      g_set_error (error, G_IO_ERROR, g_io_error_from_errno (e),

                   "%s", g_strerror (e));

      return FALSE;

    }

  if (is != NULL)

    *is = g_unix_input_stream_new (pipefd[0], TRUE);

  else

    close (pipefd[0]);

  if (os != NULL)

    *os = g_unix_output_stream_new (pipefd[1], TRUE);

  else

    close (pipefd[1]);

  return TRUE;

}

/**

 * test_bidi_pipe:

 * @left: (out) (optional): used to return one #GIOStream

 * @right: (out) (optional): used to return the other #GIOStream

 * @error: used to raise an error

 *

 * Return two #GIOStreams connected to each other with pipes.

 * The "left" input stream is connected by a unidirectional pipe

 * to the "right" output stream, and vice versa. This can be used

 * as a bidirectional pipe to a child process, for instance.

 *

 * See test_pipe() if you only need a one-way pipe.

 *

 * Returns: %TRUE on success

 */

gboolean

test_bidi_pipe (GIOStream **left,

                GIOStream **right,

                GError    **error)

{

  GInputStream *left_in = NULL;

  GOutputStream *left_out = NULL;

  GInputStream *right_in = NULL;

  GOutputStream *right_out = NULL;

  gboolean ret = FALSE;

  if (!test_pipe (&left_in, &right_out, error))

    goto out;

  if (!test_pipe (&right_in, &left_out, error))

    goto out;

  if (left != NULL)

    *left = test_io_stream_new (left_in, left_out);

  if (right != NULL)

    *right = test_io_stream_new (right_in, right_out);

  ret = TRUE;

out:

  g_clear_object (&left_in);

  g_clear_object (&left_out);

  g_clear_object (&right_in);

  g_clear_object (&right_out);

  return ret;

}