2 * Copyright (C) 2013 Canonical Ltd.
3 * Author: Robert Ancell <robert.ancell@canonical.com>
5 * This program is free software: you can redistribute it and/or modify it under
6 * the terms of the GNU General Public License as published by the Free Software
7 * Foundation, either version 3 of the License, or (at your option) any later
8 * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
18 #include <glib/gstdio.h>
21 #include "unity-system-compositor.h"
22 #include "configuration.h"
27 struct UnitySystemCompositorPrivate
29 /* Compositor process */
35 /* Command to run the compositor */
38 /* Socket to communicate on */
45 /* Pipes to communicate with compositor */
46 int to_compositor_pipe[2];
47 int from_compositor_pipe[2];
49 /* IO channel listening on for messages from the compositor */
50 GIOChannel *from_compositor_channel;
51 guint from_compositor_watch;
53 /* Buffer reading from channel */
55 gsize read_buffer_length;
56 gsize read_buffer_n_used;
58 /* Timeout when waiting for compositor to start */
62 /* TRUE when received ready signal */
66 G_DEFINE_TYPE (UnitySystemCompositor, unity_system_compositor, DISPLAY_SERVER_TYPE);
72 USC_MESSAGE_READY = 2,
73 USC_MESSAGE_SESSION_CONNECTED = 3,
74 USC_MESSAGE_SET_ACTIVE_SESSION = 4,
75 USC_MESSAGE_SET_NEXT_SESSION = 5,
78 UnitySystemCompositor *
79 unity_system_compositor_new (void)
81 return g_object_new (UNITY_SYSTEM_COMPOSITOR_TYPE, NULL);
85 unity_system_compositor_set_command (UnitySystemCompositor *compositor, const gchar *command)
87 g_return_if_fail (compositor != NULL);
88 g_free (compositor->priv->command);
89 compositor->priv->command = g_strdup (command);
93 unity_system_compositor_set_socket (UnitySystemCompositor *compositor, const gchar *socket)
95 g_return_if_fail (compositor != NULL);
96 g_free (compositor->priv->socket);
97 compositor->priv->socket = g_strdup (socket);
101 unity_system_compositor_get_socket (UnitySystemCompositor *compositor)
103 g_return_val_if_fail (compositor != NULL, NULL);
104 return compositor->priv->socket;
108 unity_system_compositor_set_vt (UnitySystemCompositor *compositor, gint vt)
110 g_return_if_fail (compositor != NULL);
112 if (compositor->priv->have_vt_ref)
113 vt_unref (compositor->priv->vt);
114 compositor->priv->have_vt_ref = FALSE;
115 compositor->priv->vt = vt;
119 compositor->priv->have_vt_ref = TRUE;
124 unity_system_compositor_set_timeout (UnitySystemCompositor *compositor, gint timeout)
126 g_return_if_fail (compositor != NULL);
127 compositor->priv->timeout = timeout;
131 write_message (UnitySystemCompositor *compositor, guint16 id, const guint8 *payload, guint16 payload_length)
134 gsize data_length = 4 + payload_length;
136 data = g_malloc (data_length);
139 data[2] = payload_length >> 8;
140 data[3] = payload_length & 0xFF;
141 memcpy (data + 4, payload, payload_length);
144 if (write (compositor->priv->to_compositor_pipe[1], data, data_length) != data_length)
145 l_warning (compositor, "Failed to write to compositor: %s", strerror (errno));
149 unity_system_compositor_set_active_session (UnitySystemCompositor *compositor, const gchar *id)
151 g_return_if_fail (compositor != NULL);
152 write_message (compositor, USC_MESSAGE_SET_ACTIVE_SESSION, (const guint8 *) id, strlen (id));
156 unity_system_compositor_set_next_session (UnitySystemCompositor *compositor, const gchar *id)
158 g_return_if_fail (compositor != NULL);
159 write_message (compositor, USC_MESSAGE_SET_NEXT_SESSION, (const guint8 *) id, strlen (id));
163 unity_system_compositor_get_vt (DisplayServer *server)
165 g_return_val_if_fail (server != NULL, 0);
166 return UNITY_SYSTEM_COMPOSITOR (server)->priv->vt;
170 unity_system_compositor_connect_session (DisplayServer *display_server, Session *session)
172 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (display_server);
175 if (compositor->priv->socket)
176 session_set_env (session, "MIR_SOCKET", compositor->priv->socket);
177 if (IS_GREETER (session))
181 session_set_env (session, "MIR_SERVER_NAME", name);
183 if (compositor->priv->vt >= 0)
185 gchar *value = g_strdup_printf ("%d", compositor->priv->vt);
186 session_set_env (session, "XDG_VTNR", value);
192 unity_system_compositor_disconnect_session (DisplayServer *display_server, Session *session)
194 session_unset_env (session, "MIR_SOCKET");
195 session_unset_env (session, "MIR_SERVER_NAME");
196 session_unset_env (session, "XDG_VTNR");
200 get_absolute_command (const gchar *command)
203 gchar *absolute_binary, *absolute_command = NULL;
205 tokens = g_strsplit (command, " ", 2);
207 absolute_binary = g_find_program_in_path (tokens[0]);
211 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
213 absolute_command = g_strdup (absolute_binary);
215 g_free (absolute_binary);
219 return absolute_command;
223 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
225 UnitySystemCompositor *compositor = data;
227 guint16 id, payload_length;
230 if (condition == G_IO_HUP)
232 l_debug (compositor, "Compositor closed communication channel");
236 /* Work out how much required for a message */
237 if (compositor->priv->read_buffer_n_used < 4)
238 n_to_read = 4 - compositor->priv->read_buffer_n_used;
241 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
242 n_to_read = 4 + payload_length - compositor->priv->read_buffer_n_used;
245 /* Read from compositor */
248 gsize n_total, n_read = 0;
250 GError *error = NULL;
252 n_total = compositor->priv->read_buffer_n_used + n_to_read;
253 if (compositor->priv->read_buffer_length < n_total)
254 compositor->priv->read_buffer = g_realloc (compositor->priv->read_buffer, n_total);
256 status = g_io_channel_read_chars (source,
257 (gchar *)compositor->priv->read_buffer + compositor->priv->read_buffer_n_used,
262 l_warning (compositor, "Failed to read from compositor: %s", error->message);
263 if (status != G_IO_STATUS_NORMAL)
265 g_clear_error (&error);
266 compositor->priv->read_buffer_n_used += n_read;
270 if (compositor->priv->read_buffer_n_used < 4)
272 id = compositor->priv->read_buffer[0] << 8 | compositor->priv->read_buffer[1];
273 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
276 if (compositor->priv->read_buffer_n_used < 4 + payload_length)
278 /*payload = compositor->priv->read_buffer + 4;*/
282 case USC_MESSAGE_PING:
283 l_debug (compositor, "PING!");
284 write_message (compositor, USC_MESSAGE_PONG, NULL, 0);
286 case USC_MESSAGE_PONG:
287 l_debug (compositor, "PONG!");
289 case USC_MESSAGE_READY:
290 l_debug (compositor, "READY");
291 if (!compositor->priv->is_ready)
293 compositor->priv->is_ready = TRUE;
294 l_debug (compositor, "Compositor ready");
295 g_source_remove (compositor->priv->timeout_source);
296 compositor->priv->timeout_source = 0;
297 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->start (DISPLAY_SERVER (compositor));
300 case USC_MESSAGE_SESSION_CONNECTED:
301 l_debug (compositor, "SESSION CONNECTED");
304 l_warning (compositor, "Ignoring unknown message %d with %d octets from system compositor", id, payload_length);
309 compositor->priv->read_buffer_n_used = 0;
315 run_cb (Process *process, UnitySystemCompositor *compositor)
319 /* Make input non-blocking */
320 fd = open ("/dev/null", O_RDONLY);
321 dup2 (fd, STDIN_FILENO);
324 /* Redirect output to logfile */
325 if (compositor->priv->log_file)
330 /* Move old file out of the way */
331 old_filename = g_strdup_printf ("%s.old", compositor->priv->log_file);
332 rename (compositor->priv->log_file, old_filename);
333 g_free (old_filename);
335 /* Create new file and log to it */
336 fd = g_open (compositor->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
338 l_warning (compositor, "Failed to open log file %s: %s", compositor->priv->log_file, g_strerror (errno));
341 dup2 (fd, STDOUT_FILENO);
342 dup2 (fd, STDERR_FILENO);
349 timeout_cb (gpointer data)
351 UnitySystemCompositor *compositor = data;
353 /* Stop the compositor - it is not working */
354 display_server_stop (DISPLAY_SERVER (compositor));
356 compositor->priv->timeout_source = 0;
362 stopped_cb (Process *process, UnitySystemCompositor *compositor)
364 l_debug (compositor, "Unity system compositor stopped");
366 if (compositor->priv->timeout_source != 0)
367 g_source_remove (compositor->priv->timeout_source);
368 compositor->priv->timeout_source = 0;
370 /* Release VT and display number for re-use */
371 if (compositor->priv->have_vt_ref)
373 vt_unref (compositor->priv->vt);
374 compositor->priv->have_vt_ref = FALSE;
377 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->stop (DISPLAY_SERVER (compositor));
381 unity_system_compositor_start (DisplayServer *server)
383 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (server);
385 gchar *dir, *command, *absolute_command, *value;
387 g_return_val_if_fail (compositor->priv->process == NULL, FALSE);
389 compositor->priv->is_ready = FALSE;
391 g_return_val_if_fail (compositor->priv->command != NULL, FALSE);
393 /* Create pipes to talk to compositor */
394 if (pipe (compositor->priv->to_compositor_pipe) < 0 || pipe (compositor->priv->from_compositor_pipe) < 0)
396 l_debug (compositor, "Failed to create compositor pipes: %s", g_strerror (errno));
400 /* Don't allow the daemon end of the pipes to be accessed in the compositor */
401 fcntl (compositor->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
402 fcntl (compositor->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
404 /* Listen for messages from the compositor */
405 compositor->priv->from_compositor_channel = g_io_channel_unix_new (compositor->priv->from_compositor_pipe[0]);
406 compositor->priv->from_compositor_watch = g_io_add_watch (compositor->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, compositor);
409 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
410 compositor->priv->log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
411 l_debug (compositor, "Logging to %s", compositor->priv->log_file);
414 /* Setup environment */
415 compositor->priv->process = process_new ();
416 process_set_clear_environment (compositor->priv->process, TRUE);
417 process_set_env (compositor->priv->process, "XDG_SEAT", "seat0");
418 value = g_strdup_printf ("%d", compositor->priv->vt);
419 process_set_env (compositor->priv->process, "XDG_VTNR", value);
421 /* Variable required for regression tests */
422 if (g_getenv ("LIGHTDM_TEST_ROOT"))
424 process_set_env (compositor->priv->process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
425 process_set_env (compositor->priv->process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
426 process_set_env (compositor->priv->process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
429 command = g_strdup_printf ("%s --file '%s' --from-dm-fd %d --to-dm-fd %d --vt %d", compositor->priv->command, compositor->priv->socket, compositor->priv->to_compositor_pipe[0], compositor->priv->from_compositor_pipe[1], compositor->priv->vt);
430 absolute_command = get_absolute_command (command);
433 /* Start the compositor */
434 process_set_command (compositor->priv->process, absolute_command);
435 g_free (absolute_command);
436 g_signal_connect (compositor->priv->process, "stopped", G_CALLBACK (stopped_cb), compositor);
437 g_signal_connect (compositor->priv->process, "run", G_CALLBACK (run_cb), compositor);
438 result = process_start (compositor->priv->process, FALSE);
440 /* Close compostor ends of the pipes */
441 close (compositor->priv->to_compositor_pipe[0]);
442 compositor->priv->to_compositor_pipe[0] = 0;
443 close (compositor->priv->from_compositor_pipe[1]);
444 compositor->priv->from_compositor_pipe[1] = 0;
449 /* Connect to the compositor */
450 if (compositor->priv->timeout > 0)
452 l_debug (compositor, "Waiting for system compositor for %ds", compositor->priv->timeout);
453 compositor->priv->timeout_source = g_timeout_add (compositor->priv->timeout * 1000, timeout_cb, compositor);
460 unity_system_compositor_stop (DisplayServer *server)
462 process_stop (UNITY_SYSTEM_COMPOSITOR (server)->priv->process);
466 unity_system_compositor_init (UnitySystemCompositor *compositor)
468 compositor->priv = G_TYPE_INSTANCE_GET_PRIVATE (compositor, UNITY_SYSTEM_COMPOSITOR_TYPE, UnitySystemCompositorPrivate);
469 compositor->priv->vt = -1;
470 compositor->priv->command = g_strdup ("unity-system-compositor");
471 compositor->priv->socket = g_strdup ("/tmp/mir_socket");
472 compositor->priv->timeout = -1;
476 unity_system_compositor_finalize (GObject *object)
478 UnitySystemCompositor *self;
480 self = UNITY_SYSTEM_COMPOSITOR (object);
482 if (self->priv->process)
484 g_signal_handlers_disconnect_matched (self->priv->process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
485 g_object_unref (self->priv->process);
487 g_free (self->priv->log_file);
488 g_free (self->priv->command);
489 g_free (self->priv->socket);
490 if (self->priv->have_vt_ref)
491 vt_unref (self->priv->vt);
492 close (self->priv->to_compositor_pipe[0]);
493 close (self->priv->to_compositor_pipe[1]);
494 close (self->priv->from_compositor_pipe[0]);
495 close (self->priv->from_compositor_pipe[1]);
496 g_io_channel_unref (self->priv->from_compositor_channel);
497 g_source_remove (self->priv->from_compositor_watch);
498 g_free (self->priv->read_buffer);
499 if (self->priv->timeout_source != 0)
500 g_source_remove (self->priv->timeout_source);
502 G_OBJECT_CLASS (unity_system_compositor_parent_class)->finalize (object);
506 unity_system_compositor_class_init (UnitySystemCompositorClass *klass)
508 GObjectClass *object_class = G_OBJECT_CLASS (klass);
509 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
511 display_server_class->get_vt = unity_system_compositor_get_vt;
512 display_server_class->connect_session = unity_system_compositor_connect_session;
513 display_server_class->disconnect_session = unity_system_compositor_disconnect_session;
514 display_server_class->start = unity_system_compositor_start;
515 display_server_class->stop = unity_system_compositor_stop;
516 object_class->finalize = unity_system_compositor_finalize;
518 g_type_class_add_private (klass, sizeof (UnitySystemCompositorPrivate));