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"
24 #include "greeter-session.h"
27 struct UnitySystemCompositorPrivate
29 /* Compositor process */
32 /* Command to run the compositor */
35 /* Socket to communicate on */
42 /* Pipes to communicate with compositor */
43 int to_compositor_pipe[2];
44 int from_compositor_pipe[2];
46 /* IO channel listening on for messages from the compositor */
47 GIOChannel *from_compositor_channel;
48 guint from_compositor_watch;
50 /* Buffer reading from channel */
52 gsize read_buffer_length;
53 gsize read_buffer_n_used;
55 /* Timeout when waiting for compositor to start */
59 /* TRUE when received ready signal */
63 G_DEFINE_TYPE (UnitySystemCompositor, unity_system_compositor, DISPLAY_SERVER_TYPE);
69 USC_MESSAGE_READY = 2,
70 USC_MESSAGE_SESSION_CONNECTED = 3,
71 USC_MESSAGE_SET_ACTIVE_SESSION = 4,
72 USC_MESSAGE_SET_NEXT_SESSION = 5,
75 UnitySystemCompositor *
76 unity_system_compositor_new (void)
78 return g_object_new (UNITY_SYSTEM_COMPOSITOR_TYPE, NULL);
82 unity_system_compositor_set_command (UnitySystemCompositor *compositor, const gchar *command)
84 g_return_if_fail (compositor != NULL);
85 g_return_if_fail (command != NULL);
87 g_free (compositor->priv->command);
88 compositor->priv->command = g_strdup (command);
92 unity_system_compositor_set_socket (UnitySystemCompositor *compositor, const gchar *socket)
94 g_return_if_fail (compositor != NULL);
95 g_free (compositor->priv->socket);
96 compositor->priv->socket = g_strdup (socket);
100 unity_system_compositor_get_socket (UnitySystemCompositor *compositor)
102 g_return_val_if_fail (compositor != NULL, NULL);
103 return compositor->priv->socket;
107 unity_system_compositor_set_vt (UnitySystemCompositor *compositor, gint vt)
109 g_return_if_fail (compositor != NULL);
111 if (compositor->priv->have_vt_ref)
112 vt_unref (compositor->priv->vt);
113 compositor->priv->have_vt_ref = FALSE;
114 compositor->priv->vt = vt;
118 compositor->priv->have_vt_ref = TRUE;
123 unity_system_compositor_set_timeout (UnitySystemCompositor *compositor, gint timeout)
125 g_return_if_fail (compositor != NULL);
126 compositor->priv->timeout = timeout;
130 write_message (UnitySystemCompositor *compositor, guint16 id, const guint8 *payload, guint16 payload_length)
133 gsize data_length = 4 + payload_length;
135 data = g_malloc (data_length);
138 data[2] = payload_length >> 8;
139 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));
151 unity_system_compositor_set_active_session (UnitySystemCompositor *compositor, const gchar *id)
153 g_return_if_fail (compositor != NULL);
154 write_message (compositor, USC_MESSAGE_SET_ACTIVE_SESSION, (const guint8 *) id, strlen (id));
158 unity_system_compositor_set_next_session (UnitySystemCompositor *compositor, const gchar *id)
160 g_return_if_fail (compositor != NULL);
161 write_message (compositor, USC_MESSAGE_SET_NEXT_SESSION, (const guint8 *) id, strlen (id));
165 unity_system_compositor_get_vt (DisplayServer *server)
167 g_return_val_if_fail (server != NULL, 0);
168 return UNITY_SYSTEM_COMPOSITOR (server)->priv->vt;
172 unity_system_compositor_connect_session (DisplayServer *display_server, Session *session)
174 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (display_server);
177 session_set_env (session, "XDG_SESSION_TYPE", "mir");
179 if (compositor->priv->socket)
180 session_set_env (session, "MIR_SERVER_HOST_SOCKET", compositor->priv->socket);
181 if (IS_GREETER_SESSION (session))
185 session_set_env (session, "MIR_SERVER_NAME", name);
187 if (compositor->priv->vt >= 0)
189 gchar *value = g_strdup_printf ("%d", compositor->priv->vt);
190 session_set_env (session, "XDG_VTNR", value);
196 unity_system_compositor_disconnect_session (DisplayServer *display_server, Session *session)
198 session_unset_env (session, "XDG_SESSION_TYPE");
199 session_unset_env (session, "MIR_SERVER_HOST_SOCKET");
200 session_unset_env (session, "MIR_SERVER_NAME");
201 session_unset_env (session, "XDG_VTNR");
205 get_absolute_command (const gchar *command)
208 gchar *absolute_binary, *absolute_command = NULL;
210 tokens = g_strsplit (command, " ", 2);
212 absolute_binary = g_find_program_in_path (tokens[0]);
216 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
218 absolute_command = g_strdup (absolute_binary);
220 g_free (absolute_binary);
224 return absolute_command;
228 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
230 UnitySystemCompositor *compositor = data;
232 guint16 id, payload_length;
235 if (condition == G_IO_HUP)
237 l_debug (compositor, "Compositor closed communication channel");
238 compositor->priv->from_compositor_watch = 0;
242 /* Work out how much required for a message */
243 if (compositor->priv->read_buffer_n_used < 4)
244 n_to_read = 4 - compositor->priv->read_buffer_n_used;
247 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
248 n_to_read = 4 + payload_length - compositor->priv->read_buffer_n_used;
251 /* Read from compositor */
254 gsize n_total, n_read = 0;
256 GError *error = NULL;
258 n_total = compositor->priv->read_buffer_n_used + n_to_read;
259 if (compositor->priv->read_buffer_length < n_total)
260 compositor->priv->read_buffer = g_realloc (compositor->priv->read_buffer, n_total);
262 status = g_io_channel_read_chars (source,
263 (gchar *)compositor->priv->read_buffer + compositor->priv->read_buffer_n_used,
268 l_warning (compositor, "Failed to read from compositor: %s", error->message);
269 if (status != G_IO_STATUS_NORMAL)
271 g_clear_error (&error);
272 compositor->priv->read_buffer_n_used += n_read;
276 if (compositor->priv->read_buffer_n_used < 4)
278 id = compositor->priv->read_buffer[0] << 8 | compositor->priv->read_buffer[1];
279 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
282 if (compositor->priv->read_buffer_n_used < 4 + payload_length)
284 /*payload = compositor->priv->read_buffer + 4;*/
288 case USC_MESSAGE_PING:
289 l_debug (compositor, "PING!");
290 write_message (compositor, USC_MESSAGE_PONG, NULL, 0);
292 case USC_MESSAGE_PONG:
293 l_debug (compositor, "PONG!");
295 case USC_MESSAGE_READY:
296 l_debug (compositor, "READY");
297 if (!compositor->priv->is_ready)
299 compositor->priv->is_ready = TRUE;
300 l_debug (compositor, "Compositor ready");
301 g_source_remove (compositor->priv->timeout_source);
302 compositor->priv->timeout_source = 0;
303 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->start (DISPLAY_SERVER (compositor));
306 case USC_MESSAGE_SESSION_CONNECTED:
307 l_debug (compositor, "SESSION CONNECTED");
310 l_warning (compositor, "Ignoring unknown message %d with %d octets from system compositor", id, payload_length);
315 compositor->priv->read_buffer_n_used = 0;
321 run_cb (Process *process, gpointer user_data)
325 /* Make input non-blocking */
326 fd = open ("/dev/null", O_RDONLY);
327 dup2 (fd, STDIN_FILENO);
332 timeout_cb (gpointer data)
334 UnitySystemCompositor *compositor = data;
336 /* Stop the compositor - it is not working */
337 display_server_stop (DISPLAY_SERVER (compositor));
339 compositor->priv->timeout_source = 0;
345 stopped_cb (Process *process, UnitySystemCompositor *compositor)
347 l_debug (compositor, "Unity system compositor stopped");
349 if (compositor->priv->timeout_source != 0)
350 g_source_remove (compositor->priv->timeout_source);
351 compositor->priv->timeout_source = 0;
353 /* Release VT and display number for re-use */
354 if (compositor->priv->have_vt_ref)
356 vt_unref (compositor->priv->vt);
357 compositor->priv->have_vt_ref = FALSE;
360 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->stop (DISPLAY_SERVER (compositor));
364 unity_system_compositor_start (DisplayServer *server)
366 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (server);
367 gboolean result, backup_logs;
369 gchar *dir, *log_file, *absolute_command, *value;
371 g_return_val_if_fail (compositor->priv->process == NULL, FALSE);
373 compositor->priv->is_ready = FALSE;
375 g_return_val_if_fail (compositor->priv->command != NULL, FALSE);
377 /* Create pipes to talk to compositor */
378 if (pipe (compositor->priv->to_compositor_pipe) < 0 || pipe (compositor->priv->from_compositor_pipe) < 0)
380 l_debug (compositor, "Failed to create compositor pipes: %s", g_strerror (errno));
384 /* Don't allow the daemon end of the pipes to be accessed in the compositor */
385 fcntl (compositor->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
386 fcntl (compositor->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
388 /* Listen for messages from the compositor */
389 compositor->priv->from_compositor_channel = g_io_channel_unix_new (compositor->priv->from_compositor_pipe[0]);
390 compositor->priv->from_compositor_watch = g_io_add_watch (compositor->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, compositor);
393 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
394 log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
395 l_debug (compositor, "Logging to %s", log_file);
398 /* Setup environment */
399 compositor->priv->process = process_new (run_cb, compositor);
400 backup_logs = config_get_boolean (config_get_instance (), "LightDM", "backup-logs");
401 process_set_log_file (compositor->priv->process, log_file, TRUE, backup_logs ? LOG_MODE_BACKUP_AND_TRUNCATE : LOG_MODE_APPEND);
403 process_set_clear_environment (compositor->priv->process, TRUE);
404 process_set_env (compositor->priv->process, "XDG_SEAT", "seat0");
405 value = g_strdup_printf ("%d", compositor->priv->vt);
406 process_set_env (compositor->priv->process, "XDG_VTNR", value);
408 /* Variable required for regression tests */
409 if (g_getenv ("LIGHTDM_TEST_ROOT"))
411 process_set_env (compositor->priv->process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
412 process_set_env (compositor->priv->process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
413 process_set_env (compositor->priv->process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
416 /* Generate command line to run */
417 absolute_command = get_absolute_command (compositor->priv->command);
418 if (!absolute_command)
420 l_debug (compositor, "Can't launch compositor %s, not found in path", compositor->priv->command);
423 command = g_string_new (absolute_command);
424 g_free (absolute_command);
425 g_string_append_printf (command, " --file '%s'", compositor->priv->socket);
426 g_string_append_printf (command, " --from-dm-fd %d --to-dm-fd %d", compositor->priv->to_compositor_pipe[0], compositor->priv->from_compositor_pipe[1]);
427 if (compositor->priv->vt > 0)
428 g_string_append_printf (command, " --vt %d", compositor->priv->vt);
429 process_set_command (compositor->priv->process, command->str);
430 g_string_free (command, TRUE);
432 /* Start the compositor */
433 g_signal_connect (compositor->priv->process, PROCESS_SIGNAL_STOPPED, G_CALLBACK (stopped_cb), compositor);
434 result = process_start (compositor->priv->process, FALSE);
436 /* Close compostor ends of the pipes */
437 close (compositor->priv->to_compositor_pipe[0]);
438 compositor->priv->to_compositor_pipe[0] = -1;
439 close (compositor->priv->from_compositor_pipe[1]);
440 compositor->priv->from_compositor_pipe[1] = -1;
445 /* Connect to the compositor */
446 if (compositor->priv->timeout > 0)
448 l_debug (compositor, "Waiting for system compositor for %ds", compositor->priv->timeout);
449 compositor->priv->timeout_source = g_timeout_add (compositor->priv->timeout * 1000, timeout_cb, compositor);
456 unity_system_compositor_stop (DisplayServer *server)
458 process_stop (UNITY_SYSTEM_COMPOSITOR (server)->priv->process);
462 unity_system_compositor_init (UnitySystemCompositor *compositor)
464 compositor->priv = G_TYPE_INSTANCE_GET_PRIVATE (compositor, UNITY_SYSTEM_COMPOSITOR_TYPE, UnitySystemCompositorPrivate);
465 compositor->priv->vt = -1;
466 compositor->priv->command = g_strdup ("unity-system-compositor");
467 compositor->priv->socket = g_strdup ("/run/mir_socket");
468 compositor->priv->timeout = -1;
469 compositor->priv->to_compositor_pipe[0] = -1;
470 compositor->priv->to_compositor_pipe[1] = -1;
471 compositor->priv->from_compositor_pipe[0] = -1;
472 compositor->priv->from_compositor_pipe[1] = -1;
476 unity_system_compositor_finalize (GObject *object)
478 UnitySystemCompositor *self = UNITY_SYSTEM_COMPOSITOR (object);
480 if (self->priv->process)
482 g_signal_handlers_disconnect_matched (self->priv->process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
483 g_object_unref (self->priv->process);
485 g_free (self->priv->command);
486 g_free (self->priv->socket);
487 if (self->priv->have_vt_ref)
488 vt_unref (self->priv->vt);
489 close (self->priv->to_compositor_pipe[0]);
490 close (self->priv->to_compositor_pipe[1]);
491 close (self->priv->from_compositor_pipe[0]);
492 close (self->priv->from_compositor_pipe[1]);
493 g_io_channel_unref (self->priv->from_compositor_channel);
494 if (self->priv->from_compositor_watch)
495 g_source_remove (self->priv->from_compositor_watch);
496 g_free (self->priv->read_buffer);
497 if (self->priv->timeout_source)
498 g_source_remove (self->priv->timeout_source);
500 G_OBJECT_CLASS (unity_system_compositor_parent_class)->finalize (object);
504 unity_system_compositor_class_init (UnitySystemCompositorClass *klass)
506 GObjectClass *object_class = G_OBJECT_CLASS (klass);
507 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
509 display_server_class->get_vt = unity_system_compositor_get_vt;
510 display_server_class->connect_session = unity_system_compositor_connect_session;
511 display_server_class->disconnect_session = unity_system_compositor_disconnect_session;
512 display_server_class->start = unity_system_compositor_start;
513 display_server_class->stop = unity_system_compositor_stop;
514 object_class->finalize = unity_system_compositor_finalize;
516 g_type_class_add_private (klass, sizeof (UnitySystemCompositorPrivate));