1 /* Unix pipe-to-self. This is a utility module for tests, not a test.
2 *
3 * Copyright © 2008-2010 Red Hat, Inc.
4 * Copyright © 2011 Nokia Corporation
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General
17 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 * Author: Simon McVittie <simon.mcvittie@collabora.co.uk>
20 */
21
22 #include <errno.h>
23 #include <unistd.h>
24
25 #include <gio/gio.h>
26
27 #include "test-io-stream.h"
28 #include "test-pipe-unix.h"
29
30 #ifdef G_OS_UNIX
31 # include <gio/gunixinputstream.h>
32 # include <gio/gunixoutputstream.h>
33 #else
34 # error This module only exists on Unix
35 #endif
36
37 /**
38 * test_pipe:
39 * @is: (out) (optional): used to return a #GInputStream
40 * @os: (out) (optional): used to return a #GOutputStream
41 * @error: used to raise an error
42 *
43 * Return a "pipe to self" connecting @is to @os. This can be used
44 * as a unidirectional pipe to or from a child process, for instance.
45 *
46 * See test_bidi_pipe() if you want to emulate a bidirectional pipe
47 * via a pair of unidirectional pipes.
48 *
49 * Returns: %TRUE on success
50 */
51 gboolean
test_pipe(GInputStream ** is,GOutputStream ** os,GError ** error)52 test_pipe (GInputStream **is,
53 GOutputStream **os,
54 GError **error)
55 {
56 int pipefd[2];
57 int ret;
58
59 ret = pipe (pipefd);
60
61 if (ret != 0)
62 {
63 int e = errno;
64
65 g_set_error (error, G_IO_ERROR, g_io_error_from_errno (e),
66 "%s", g_strerror (e));
67 return FALSE;
68 }
69
70 if (is != NULL)
71 *is = g_unix_input_stream_new (pipefd[0], TRUE);
72 else
73 close (pipefd[0]);
74
75 if (os != NULL)
76 *os = g_unix_output_stream_new (pipefd[1], TRUE);
77 else
78 close (pipefd[1]);
79
80 return TRUE;
81 }
82
83 /**
84 * test_bidi_pipe:
85 * @left: (out) (optional): used to return one #GIOStream
86 * @right: (out) (optional): used to return the other #GIOStream
87 * @error: used to raise an error
88 *
89 * Return two #GIOStreams connected to each other with pipes.
90 * The "left" input stream is connected by a unidirectional pipe
91 * to the "right" output stream, and vice versa. This can be used
92 * as a bidirectional pipe to a child process, for instance.
93 *
94 * See test_pipe() if you only need a one-way pipe.
95 *
96 * Returns: %TRUE on success
97 */
98 gboolean
test_bidi_pipe(GIOStream ** left,GIOStream ** right,GError ** error)99 test_bidi_pipe (GIOStream **left,
100 GIOStream **right,
101 GError **error)
102 {
103 GInputStream *left_in = NULL;
104 GOutputStream *left_out = NULL;
105 GInputStream *right_in = NULL;
106 GOutputStream *right_out = NULL;
107 gboolean ret = FALSE;
108
109 if (!test_pipe (&left_in, &right_out, error))
110 goto out;
111
112 if (!test_pipe (&right_in, &left_out, error))
113 goto out;
114
115 if (left != NULL)
116 *left = test_io_stream_new (left_in, left_out);
117
118 if (right != NULL)
119 *right = test_io_stream_new (right_in, right_out);
120
121 ret = TRUE;
122
123 out:
124 g_clear_object (&left_in);
125 g_clear_object (&left_out);
126 g_clear_object (&right_in);
127 g_clear_object (&right_out);
128 return ret;
129 }
130