1 /* GLib testing framework examples and tests
2 * Copyright (C) 2008 Red Hat, Inc
3 *
4 * This work is provided "as is"; redistribution and modification
5 * in whole or in part, in any medium, physical or electronic is
6 * permitted without restriction.
7 *
8 * This work is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * In no event shall the authors or contributors be liable for any
13 * direct, indirect, incidental, special, exemplary, or consequential
14 * damages (including, but not limited to, procurement of substitute
15 * goods or services; loss of use, data, or profits; or business
16 * interruption) however caused and on any theory of liability, whether
17 * in contract, strict liability, or tort (including negligence or
18 * otherwise) arising in any way out of the use of this software, even
19 * if advised of the possibility of such damage.
20 */
21
22 #include <glib/glib.h>
23 #include <gio/gio.h>
24 #include <gio/gunixinputstream.h>
25 #include <gio/gunixoutputstream.h>
26 #include <signal.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 #define DATA "abcdefghijklmnopqrstuvwxyz"
32
33 int writer_pipe[2], reader_pipe[2];
34 GCancellable *writer_cancel, *reader_cancel, *main_cancel;
35 GMainLoop *loop;
36
37 static gpointer
writer_thread(gpointer user_data)38 writer_thread (gpointer user_data)
39 {
40 GOutputStream *out;
41 gssize nwrote, offset;
42 GError *err = NULL;
43
44 out = g_unix_output_stream_new (writer_pipe[1], TRUE);
45
46 do
47 {
48 g_usleep (10);
49
50 offset = 0;
51 while (offset < sizeof (DATA))
52 {
53 nwrote = g_output_stream_write (out, DATA + offset,
54 sizeof (DATA) - offset,
55 writer_cancel, &err);
56 if (nwrote <= 0 || err != NULL)
57 break;
58 offset += nwrote;
59 }
60
61 g_assert (nwrote > 0 || err != NULL);
62 }
63 while (err == NULL);
64
65 if (g_cancellable_is_cancelled (writer_cancel))
66 {
67 g_cancellable_cancel (main_cancel);
68 g_object_unref (out);
69 return NULL;
70 }
71
72 g_warning ("writer: %s", err->message);
73 g_assert_not_reached ();
74 }
75
76 static gpointer
reader_thread(gpointer user_data)77 reader_thread (gpointer user_data)
78 {
79 GInputStream *in;
80 gssize nread, total;
81 GError *err = NULL;
82 char buf[sizeof (DATA)];
83
84 in = g_unix_input_stream_new (reader_pipe[0], TRUE);
85
86 do
87 {
88 total = 0;
89 while (total < sizeof (DATA))
90 {
91 nread = g_input_stream_read (in, buf + total, sizeof (buf) - total,
92 reader_cancel, &err);
93 if (nread <= 0 || err != NULL)
94 break;
95 total += nread;
96 }
97
98 if (err)
99 break;
100
101 if (nread == 0)
102 {
103 g_assert (err == NULL);
104 /* pipe closed */
105 g_object_unref (in);
106 return NULL;
107 }
108
109 g_assert_cmpstr (buf, ==, DATA);
110 g_assert (!g_cancellable_is_cancelled (reader_cancel));
111 }
112 while (err == NULL);
113
114 g_warning ("reader: %s", err->message);
115 g_assert_not_reached ();
116 }
117
118 char main_buf[sizeof (DATA)];
119 gssize main_len, main_offset;
120
121 static void readable (GObject *source, GAsyncResult *res, gpointer user_data);
122 static void writable (GObject *source, GAsyncResult *res, gpointer user_data);
123
124 static void
do_main_cancel(GOutputStream * out)125 do_main_cancel (GOutputStream *out)
126 {
127 g_output_stream_close (out, NULL, NULL);
128 g_main_loop_quit (loop);
129 }
130
131 static void
readable(GObject * source,GAsyncResult * res,gpointer user_data)132 readable (GObject *source, GAsyncResult *res, gpointer user_data)
133 {
134 GInputStream *in = G_INPUT_STREAM (source);
135 GOutputStream *out = user_data;
136 GError *err = NULL;
137
138 main_len = g_input_stream_read_finish (in, res, &err);
139
140 if (g_cancellable_is_cancelled (main_cancel))
141 {
142 do_main_cancel (out);
143 return;
144 }
145
146 g_assert (err == NULL);
147
148 main_offset = 0;
149 g_output_stream_write_async (out, main_buf, main_len,
150 G_PRIORITY_DEFAULT, main_cancel,
151 writable, in);
152 }
153
154 static void
writable(GObject * source,GAsyncResult * res,gpointer user_data)155 writable (GObject *source, GAsyncResult *res, gpointer user_data)
156 {
157 GOutputStream *out = G_OUTPUT_STREAM (source);
158 GInputStream *in = user_data;
159 GError *err = NULL;
160 gssize nwrote;
161
162 nwrote = g_output_stream_write_finish (out, res, &err);
163
164 if (g_cancellable_is_cancelled (main_cancel))
165 {
166 do_main_cancel (out);
167 return;
168 }
169
170 g_assert (err == NULL);
171 g_assert_cmpint (nwrote, <=, main_len - main_offset);
172
173 main_offset += nwrote;
174 if (main_offset == main_len)
175 {
176 g_input_stream_read_async (in, main_buf, sizeof (main_buf),
177 G_PRIORITY_DEFAULT, main_cancel,
178 readable, out);
179 }
180 else
181 {
182 g_output_stream_write_async (out, main_buf + main_offset,
183 main_len - main_offset,
184 G_PRIORITY_DEFAULT, main_cancel,
185 writable, in);
186 }
187 }
188
189 static gboolean
timeout(gpointer cancellable)190 timeout (gpointer cancellable)
191 {
192 g_cancellable_cancel (cancellable);
193 return FALSE;
194 }
195
196 static void
test_pipe_io(void)197 test_pipe_io (void)
198 {
199 GThread *writer, *reader;
200 GInputStream *in;
201 GOutputStream *out;
202
203 /* Split off two (additional) threads, a reader and a writer. From
204 * the writer thread, write data synchronously in small chunks,
205 * which gets read asynchronously by the main thread and then
206 * written asynchronously to the reader thread, which reads it
207 * synchronously. Eventually a timeout in the main thread will cause
208 * it to cancel the writer thread, which will in turn cancel the
209 * read op in the main thread, which will then close the pipe to
210 * the reader thread, causing the read op to fail.
211 */
212
213 g_assert (pipe (writer_pipe) == 0 && pipe (reader_pipe) == 0);
214
215 writer_cancel = g_cancellable_new ();
216 reader_cancel = g_cancellable_new ();
217 main_cancel = g_cancellable_new ();
218
219 writer = g_thread_create (writer_thread, NULL, TRUE, NULL);
220 reader = g_thread_create (reader_thread, NULL, TRUE, NULL);
221
222 in = g_unix_input_stream_new (writer_pipe[0], TRUE);
223 out = g_unix_output_stream_new (reader_pipe[1], TRUE);
224
225 g_input_stream_read_async (in, main_buf, sizeof (main_buf),
226 G_PRIORITY_DEFAULT, main_cancel,
227 readable, out);
228
229 g_timeout_add (500, timeout, writer_cancel);
230
231 loop = g_main_loop_new (NULL, TRUE);
232 g_main_loop_run (loop);
233 g_main_loop_unref (loop);
234
235 g_thread_join (reader);
236 g_thread_join (writer);
237
238 g_object_unref (main_cancel);
239 g_object_unref (reader_cancel);
240 g_object_unref (writer_cancel);
241 g_object_unref (in);
242 g_object_unref (out);
243 }
244
245 int
main(int argc,char * argv[])246 main (int argc,
247 char *argv[])
248 {
249 g_thread_init (NULL);
250 g_type_init ();
251 g_test_init (&argc, &argv, NULL);
252
253 g_test_add_func ("/unix-streams/pipe-io-test", test_pipe_io);
254
255 return g_test_run();
256 }
257