glib/gio/tests/test-pipe-unix.c

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/* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* 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) (allow-none): used to return a #GInputStream
* @os: (out) (allow-none): 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) (allow-none): used to return one #GIOStream
* @right: (out) (allow-none): used to return the other #GIOStream
* @error: used to raise an error
*
* Return two #GIOStream<!---->s 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;
}