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 */
32 /* Command to run the compositor */
35 /* Socket to communicate on */
42 /* TRUE if should show hardware cursor */
43 gboolean enable_hardware_cursor;
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_return_if_fail (command != NULL);
90 g_free (compositor->priv->command);
91 compositor->priv->command = g_strdup (command);
95 unity_system_compositor_set_socket (UnitySystemCompositor *compositor, const gchar *socket)
97 g_return_if_fail (compositor != NULL);
98 g_free (compositor->priv->socket);
99 compositor->priv->socket = g_strdup (socket);
103 unity_system_compositor_get_socket (UnitySystemCompositor *compositor)
105 g_return_val_if_fail (compositor != NULL, NULL);
106 return compositor->priv->socket;
110 unity_system_compositor_set_vt (UnitySystemCompositor *compositor, gint vt)
112 g_return_if_fail (compositor != NULL);
114 if (compositor->priv->have_vt_ref)
115 vt_unref (compositor->priv->vt);
116 compositor->priv->have_vt_ref = FALSE;
117 compositor->priv->vt = vt;
121 compositor->priv->have_vt_ref = TRUE;
126 unity_system_compositor_set_enable_hardware_cursor (UnitySystemCompositor *compositor, gboolean enable_cursor)
128 g_return_if_fail (compositor != NULL);
129 compositor->priv->enable_hardware_cursor = enable_cursor;
133 unity_system_compositor_set_timeout (UnitySystemCompositor *compositor, gint timeout)
135 g_return_if_fail (compositor != NULL);
136 compositor->priv->timeout = timeout;
140 write_message (UnitySystemCompositor *compositor, guint16 id, const guint8 *payload, guint16 payload_length)
143 gsize data_length = 4 + payload_length;
145 data = g_malloc (data_length);
148 data[2] = payload_length >> 8;
149 data[3] = payload_length & 0xFF;
150 memcpy (data + 4, payload, payload_length);
153 if (write (compositor->priv->to_compositor_pipe[1], data, data_length) != data_length)
154 l_warning (compositor, "Failed to write to compositor: %s", strerror (errno));
160 unity_system_compositor_set_active_session (UnitySystemCompositor *compositor, const gchar *id)
162 g_return_if_fail (compositor != NULL);
163 write_message (compositor, USC_MESSAGE_SET_ACTIVE_SESSION, (const guint8 *) id, strlen (id));
167 unity_system_compositor_set_next_session (UnitySystemCompositor *compositor, const gchar *id)
169 g_return_if_fail (compositor != NULL);
170 write_message (compositor, USC_MESSAGE_SET_NEXT_SESSION, (const guint8 *) id, strlen (id));
174 unity_system_compositor_get_vt (DisplayServer *server)
176 g_return_val_if_fail (server != NULL, 0);
177 return UNITY_SYSTEM_COMPOSITOR (server)->priv->vt;
181 unity_system_compositor_connect_session (DisplayServer *display_server, Session *session)
183 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (display_server);
186 session_set_env (session, "XDG_SESSION_TYPE", "mir");
188 if (compositor->priv->socket)
189 session_set_env (session, "MIR_SOCKET", compositor->priv->socket);
190 if (IS_GREETER (session))
194 session_set_env (session, "MIR_SERVER_NAME", name);
196 if (compositor->priv->vt >= 0)
198 gchar *value = g_strdup_printf ("%d", compositor->priv->vt);
199 session_set_env (session, "XDG_VTNR", value);
205 unity_system_compositor_disconnect_session (DisplayServer *display_server, Session *session)
207 session_unset_env (session, "XDG_SESSION_TYPE");
208 session_unset_env (session, "MIR_SOCKET");
209 session_unset_env (session, "MIR_SERVER_NAME");
210 session_unset_env (session, "XDG_VTNR");
214 get_absolute_command (const gchar *command)
217 gchar *absolute_binary, *absolute_command = NULL;
219 tokens = g_strsplit (command, " ", 2);
221 absolute_binary = g_find_program_in_path (tokens[0]);
225 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
227 absolute_command = g_strdup (absolute_binary);
229 g_free (absolute_binary);
233 return absolute_command;
237 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
239 UnitySystemCompositor *compositor = data;
241 guint16 id, payload_length;
244 if (condition == G_IO_HUP)
246 l_debug (compositor, "Compositor closed communication channel");
247 compositor->priv->from_compositor_watch = 0;
251 /* Work out how much required for a message */
252 if (compositor->priv->read_buffer_n_used < 4)
253 n_to_read = 4 - compositor->priv->read_buffer_n_used;
256 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
257 n_to_read = 4 + payload_length - compositor->priv->read_buffer_n_used;
260 /* Read from compositor */
263 gsize n_total, n_read = 0;
265 GError *error = NULL;
267 n_total = compositor->priv->read_buffer_n_used + n_to_read;
268 if (compositor->priv->read_buffer_length < n_total)
269 compositor->priv->read_buffer = g_realloc (compositor->priv->read_buffer, n_total);
271 status = g_io_channel_read_chars (source,
272 (gchar *)compositor->priv->read_buffer + compositor->priv->read_buffer_n_used,
277 l_warning (compositor, "Failed to read from compositor: %s", error->message);
278 if (status != G_IO_STATUS_NORMAL)
280 g_clear_error (&error);
281 compositor->priv->read_buffer_n_used += n_read;
285 if (compositor->priv->read_buffer_n_used < 4)
287 id = compositor->priv->read_buffer[0] << 8 | compositor->priv->read_buffer[1];
288 payload_length = compositor->priv->read_buffer[2] << 8 | compositor->priv->read_buffer[3];
291 if (compositor->priv->read_buffer_n_used < 4 + payload_length)
293 /*payload = compositor->priv->read_buffer + 4;*/
297 case USC_MESSAGE_PING:
298 l_debug (compositor, "PING!");
299 write_message (compositor, USC_MESSAGE_PONG, NULL, 0);
301 case USC_MESSAGE_PONG:
302 l_debug (compositor, "PONG!");
304 case USC_MESSAGE_READY:
305 l_debug (compositor, "READY");
306 if (!compositor->priv->is_ready)
308 compositor->priv->is_ready = TRUE;
309 l_debug (compositor, "Compositor ready");
310 g_source_remove (compositor->priv->timeout_source);
311 compositor->priv->timeout_source = 0;
312 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->start (DISPLAY_SERVER (compositor));
315 case USC_MESSAGE_SESSION_CONNECTED:
316 l_debug (compositor, "SESSION CONNECTED");
319 l_warning (compositor, "Ignoring unknown message %d with %d octets from system compositor", id, payload_length);
324 compositor->priv->read_buffer_n_used = 0;
330 run_cb (Process *process, gpointer user_data)
334 /* Make input non-blocking */
335 fd = open ("/dev/null", O_RDONLY);
336 dup2 (fd, STDIN_FILENO);
341 timeout_cb (gpointer data)
343 UnitySystemCompositor *compositor = data;
345 /* Stop the compositor - it is not working */
346 display_server_stop (DISPLAY_SERVER (compositor));
348 compositor->priv->timeout_source = 0;
354 stopped_cb (Process *process, UnitySystemCompositor *compositor)
356 l_debug (compositor, "Unity system compositor stopped");
358 if (compositor->priv->timeout_source != 0)
359 g_source_remove (compositor->priv->timeout_source);
360 compositor->priv->timeout_source = 0;
362 /* Release VT and display number for re-use */
363 if (compositor->priv->have_vt_ref)
365 vt_unref (compositor->priv->vt);
366 compositor->priv->have_vt_ref = FALSE;
369 DISPLAY_SERVER_CLASS (unity_system_compositor_parent_class)->stop (DISPLAY_SERVER (compositor));
373 unity_system_compositor_start (DisplayServer *server)
375 UnitySystemCompositor *compositor = UNITY_SYSTEM_COMPOSITOR (server);
378 gchar *dir, *log_file, *absolute_command, *value;
380 g_return_val_if_fail (compositor->priv->process == NULL, FALSE);
382 compositor->priv->is_ready = FALSE;
384 g_return_val_if_fail (compositor->priv->command != NULL, FALSE);
386 /* Create pipes to talk to compositor */
387 if (pipe (compositor->priv->to_compositor_pipe) < 0 || pipe (compositor->priv->from_compositor_pipe) < 0)
389 l_debug (compositor, "Failed to create compositor pipes: %s", g_strerror (errno));
393 /* Don't allow the daemon end of the pipes to be accessed in the compositor */
394 fcntl (compositor->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
395 fcntl (compositor->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
397 /* Listen for messages from the compositor */
398 compositor->priv->from_compositor_channel = g_io_channel_unix_new (compositor->priv->from_compositor_pipe[0]);
399 compositor->priv->from_compositor_watch = g_io_add_watch (compositor->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, compositor);
402 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
403 log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
404 l_debug (compositor, "Logging to %s", log_file);
407 /* Setup environment */
408 compositor->priv->process = process_new (run_cb, compositor);
409 process_set_log_file (compositor->priv->process, log_file, TRUE);
411 process_set_clear_environment (compositor->priv->process, TRUE);
412 process_set_env (compositor->priv->process, "XDG_SEAT", "seat0");
413 value = g_strdup_printf ("%d", compositor->priv->vt);
414 process_set_env (compositor->priv->process, "XDG_VTNR", value);
416 /* Variable required for regression tests */
417 if (g_getenv ("LIGHTDM_TEST_ROOT"))
419 process_set_env (compositor->priv->process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
420 process_set_env (compositor->priv->process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
421 process_set_env (compositor->priv->process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
424 /* Generate command line to run */
425 absolute_command = get_absolute_command (compositor->priv->command);
426 if (!absolute_command)
428 l_debug (compositor, "Can't launch compositor %s, not found in path", compositor->priv->command);
431 command = g_string_new (absolute_command);
432 g_free (absolute_command);
433 g_string_append_printf (command, " --file '%s'", compositor->priv->socket);
434 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]);
435 if (compositor->priv->vt > 0)
436 g_string_append_printf (command, " --vt %d", compositor->priv->vt);
437 if (compositor->priv->enable_hardware_cursor)
438 g_string_append (command, " --enable-hardware-cursor=true");
439 process_set_command (compositor->priv->process, command->str);
440 g_string_free (command, TRUE);
442 /* Start the compositor */
443 g_signal_connect (compositor->priv->process, PROCESS_SIGNAL_STOPPED, G_CALLBACK (stopped_cb), compositor);
444 result = process_start (compositor->priv->process, FALSE);
446 /* Close compostor ends of the pipes */
447 close (compositor->priv->to_compositor_pipe[0]);
448 compositor->priv->to_compositor_pipe[0] = 0;
449 close (compositor->priv->from_compositor_pipe[1]);
450 compositor->priv->from_compositor_pipe[1] = 0;
455 /* Connect to the compositor */
456 if (compositor->priv->timeout > 0)
458 l_debug (compositor, "Waiting for system compositor for %ds", compositor->priv->timeout);
459 compositor->priv->timeout_source = g_timeout_add (compositor->priv->timeout * 1000, timeout_cb, compositor);
466 unity_system_compositor_stop (DisplayServer *server)
468 process_stop (UNITY_SYSTEM_COMPOSITOR (server)->priv->process);
472 unity_system_compositor_init (UnitySystemCompositor *compositor)
474 compositor->priv = G_TYPE_INSTANCE_GET_PRIVATE (compositor, UNITY_SYSTEM_COMPOSITOR_TYPE, UnitySystemCompositorPrivate);
475 compositor->priv->vt = -1;
476 compositor->priv->command = g_strdup ("unity-system-compositor");
477 compositor->priv->socket = g_strdup ("/run/mir_socket");
478 compositor->priv->timeout = -1;
482 unity_system_compositor_finalize (GObject *object)
484 UnitySystemCompositor *self;
486 self = UNITY_SYSTEM_COMPOSITOR (object);
488 if (self->priv->process)
490 g_signal_handlers_disconnect_matched (self->priv->process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
491 g_object_unref (self->priv->process);
493 g_free (self->priv->command);
494 g_free (self->priv->socket);
495 if (self->priv->have_vt_ref)
496 vt_unref (self->priv->vt);
497 close (self->priv->to_compositor_pipe[0]);
498 close (self->priv->to_compositor_pipe[1]);
499 close (self->priv->from_compositor_pipe[0]);
500 close (self->priv->from_compositor_pipe[1]);
501 g_io_channel_unref (self->priv->from_compositor_channel);
502 if (self->priv->from_compositor_watch)
503 g_source_remove (self->priv->from_compositor_watch);
504 g_free (self->priv->read_buffer);
505 if (self->priv->timeout_source)
506 g_source_remove (self->priv->timeout_source);
508 G_OBJECT_CLASS (unity_system_compositor_parent_class)->finalize (object);
512 unity_system_compositor_class_init (UnitySystemCompositorClass *klass)
514 GObjectClass *object_class = G_OBJECT_CLASS (klass);
515 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
517 display_server_class->get_vt = unity_system_compositor_get_vt;
518 display_server_class->connect_session = unity_system_compositor_connect_session;
519 display_server_class->disconnect_session = unity_system_compositor_disconnect_session;
520 display_server_class->start = unity_system_compositor_start;
521 display_server_class->stop = unity_system_compositor_stop;
522 object_class->finalize = unity_system_compositor_finalize;
524 g_type_class_add_private (klass, sizeof (UnitySystemCompositorPrivate));