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Diffstat (limited to 'libegg/eggsmclient.c')
| -rw-r--r-- | libegg/eggsmclient.c | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/libegg/eggsmclient.c b/libegg/eggsmclient.c new file mode 100644 index 00000000..4886f147 --- /dev/null +++ b/libegg/eggsmclient.c @@ -0,0 +1,612 @@ +/* + * Copyright (C) 2007 Novell, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#include "config.h" + +#include <string.h> +#include <glib/gi18n.h> + +#include "eggsmclient.h" +#include "eggsmclient-private.h" + +static void egg_sm_client_debug_handler (const char *log_domain, + GLogLevelFlags log_level, + const char *message, + gpointer user_data); + +enum +{ + SAVE_STATE, + QUIT_REQUESTED, + QUIT_CANCELLED, + QUIT, + LAST_SIGNAL +}; + +static guint signals[LAST_SIGNAL] = { 0 }; + +struct _EggSMClientPrivate +{ + GKeyFile *state_file; +}; + +#define EGG_SM_CLIENT_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), EGG_TYPE_SM_CLIENT, EggSMClientPrivate)) + +G_DEFINE_TYPE (EggSMClient, egg_sm_client, G_TYPE_OBJECT) + +static EggSMClient *global_client; +static EggSMClientMode global_client_mode = EGG_SM_CLIENT_MODE_NORMAL; + +static gboolean +running_in_mate (void) +{ + return (g_strcmp0 (g_getenv ("XDG_CURRENT_DESKTOP"), "MATE") == 0) + || (g_strcmp0 (g_getenv ("XDG_SESSION_DESKTOP"), "MATE") == 0) + || (g_strcmp0 (g_getenv ("DESKTOP_SESSION"), "MATE") == 0); +} + +static void +egg_sm_client_init (EggSMClient *client) +{ + ; +} + +static void +egg_sm_client_class_init (EggSMClientClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + g_type_class_add_private (klass, sizeof (EggSMClientPrivate)); + + /** + * EggSMClient::save_state: + * @client: the client + * @state_file: a #GKeyFile to save state information into + * + * Emitted when the session manager has requested that the + * application save information about its current state. The + * application should save its state into @state_file, and then the + * session manager may then restart the application in a future + * session and tell it to initialize itself from that state. + * + * You should not save any data into @state_file's "start group" + * (ie, the %NULL group). Instead, applications should save their + * data into groups with names that start with the application name, + * and libraries that connect to this signal should save their data + * into groups with names that start with the library name. + * + * Alternatively, rather than (or in addition to) using @state_file, + * the application can save its state by calling + * egg_sm_client_set_restart_command() during the processing of this + * signal (eg, to include a list of files to open). + **/ + signals[SAVE_STATE] = + g_signal_new ("save_state", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EggSMClientClass, save_state), + NULL, NULL, + g_cclosure_marshal_VOID__POINTER, + G_TYPE_NONE, + 1, G_TYPE_POINTER); + + /** + * EggSMClient::quit_requested: + * @client: the client + * + * Emitted when the session manager requests that the application + * exit (generally because the user is logging out). The application + * should decide whether or not it is willing to quit (perhaps after + * asking the user what to do with documents that have unsaved + * changes) and then call egg_sm_client_will_quit(), passing %TRUE + * or %FALSE to give its answer to the session manager. (It does not + * need to give an answer before returning from the signal handler; + * it can interact with the user asynchronously and then give its + * answer later on.) If the application does not connect to this + * signal, then #EggSMClient will automatically return %TRUE on its + * behalf. + * + * The application should not save its session state as part of + * handling this signal; if the user has requested that the session + * be saved when logging out, then ::save_state will be emitted + * separately. + * + * If the application agrees to quit, it should then wait for either + * the ::quit_cancelled or ::quit signals to be emitted. + **/ + signals[QUIT_REQUESTED] = + g_signal_new ("quit_requested", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EggSMClientClass, quit_requested), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, + 0); + + /** + * EggSMClient::quit_cancelled: + * @client: the client + * + * Emitted when the session manager decides to cancel a logout after + * the application has already agreed to quit. After receiving this + * signal, the application can go back to what it was doing before + * receiving the ::quit_requested signal. + **/ + signals[QUIT_CANCELLED] = + g_signal_new ("quit_cancelled", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EggSMClientClass, quit_cancelled), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, + 0); + + /** + * EggSMClient::quit: + * @client: the client + * + * Emitted when the session manager wants the application to quit + * (generally because the user is logging out). The application + * should exit as soon as possible after receiving this signal; if + * it does not, the session manager may choose to forcibly kill it. + * + * Normally a GUI application would only be sent a ::quit if it + * agreed to quit in response to a ::quit_requested signal. However, + * this is not guaranteed; in some situations the session manager + * may decide to end the session without giving applications a + * chance to object. + **/ + signals[QUIT] = + g_signal_new ("quit", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (EggSMClientClass, quit), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, + 0); +} + +static gboolean sm_client_disable = FALSE; +static char *sm_client_state_file = NULL; +static char *sm_client_id = NULL; +static char *sm_config_prefix = NULL; + +static gboolean +sm_client_post_parse_func (GOptionContext *context, + GOptionGroup *group, + gpointer data, + GError **error) +{ + EggSMClient *client = egg_sm_client_get (); + + if (sm_client_id == NULL) + { + const gchar *desktop_autostart_id; + + desktop_autostart_id = g_getenv ("DESKTOP_AUTOSTART_ID"); + + if (desktop_autostart_id != NULL) + sm_client_id = g_strdup (desktop_autostart_id); + } + + /* Unset DESKTOP_AUTOSTART_ID in order to avoid child processes to + * use the same client id. */ + g_unsetenv ("DESKTOP_AUTOSTART_ID"); + + if (EGG_SM_CLIENT_GET_CLASS (client)->startup) + EGG_SM_CLIENT_GET_CLASS (client)->startup (client, sm_client_id); + return TRUE; +} + +/** + * egg_sm_client_get_option_group: + * + * Creates a %GOptionGroup containing the session-management-related + * options. You should add this group to the application's + * %GOptionContext if you want to use #EggSMClient. + * + * Return value: the %GOptionGroup + **/ +GOptionGroup * +egg_sm_client_get_option_group (void) +{ + const GOptionEntry entries[] = + { + { + "sm-client-disable", 0, 0, + G_OPTION_ARG_NONE, &sm_client_disable, + N_("Disable connection to session manager"), NULL + }, + { + "sm-client-state-file", 0, 0, + G_OPTION_ARG_FILENAME, &sm_client_state_file, + N_("Specify file containing saved configuration"), N_("FILE") + }, + { + "sm-client-id", 0, 0, + G_OPTION_ARG_STRING, &sm_client_id, + N_("Specify session management ID"), N_("ID") + }, + /* MateClient compatibility option */ + { + "sm-disable", 0, G_OPTION_FLAG_HIDDEN, + G_OPTION_ARG_NONE, &sm_client_disable, + NULL, NULL + }, + /* MateClient compatibility option. This is a dummy option that only + * exists so that sessions saved by apps with MateClient can be restored + * later when they've switched to EggSMClient. See bug #575308. + */ + { + "sm-config-prefix", 0, G_OPTION_FLAG_HIDDEN, + G_OPTION_ARG_STRING, &sm_config_prefix, + NULL, NULL + }, + { NULL } + }; + GOptionGroup *group; + + /* Use our own debug handler for the "EggSMClient" domain. */ + g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, + egg_sm_client_debug_handler, NULL); + + group = g_option_group_new ("sm-client", + _("Session management options:"), + _("Show session management options"), + NULL, NULL); + g_option_group_add_entries (group, entries); + g_option_group_set_parse_hooks (group, NULL, sm_client_post_parse_func); + + return group; +} + +/** + * egg_sm_client_set_mode: + * @mode: an #EggSMClient mode + * + * Sets the "mode" of #EggSMClient as follows: + * + * %EGG_SM_CLIENT_MODE_DISABLED: Session management is completely + * disabled. The application will not even connect to the session + * manager. (egg_sm_client_get() will still return an #EggSMClient, + * but it will just be a dummy object.) + * + * %EGG_SM_CLIENT_MODE_NO_RESTART: The application will connect to + * the session manager (and thus will receive notification when the + * user is logging out, etc), but will request to not be + * automatically restarted with saved state in future sessions. + * + * %EGG_SM_CLIENT_MODE_NORMAL: The default. #EggSMCLient will + * function normally. + * + * This must be called before the application's main loop begins. + **/ +void +egg_sm_client_set_mode (EggSMClientMode mode) +{ + global_client_mode = mode; +} + +/** + * egg_sm_client_get_mode: + * + * Gets the global #EggSMClientMode. See egg_sm_client_set_mode() + * for details. + * + * Return value: the global #EggSMClientMode + **/ +EggSMClientMode +egg_sm_client_get_mode (void) +{ + return global_client_mode; +} + +/** + * egg_sm_client_get: + * + * Returns the master #EggSMClient for the application. + * + * On platforms that support saved sessions (ie, POSIX/X11), the + * application will only request to be restarted by the session + * manager if you call egg_set_desktop_file() to set an application + * desktop file. In particular, if the desktop file contains the key + * "X + * + * Return value: the master #EggSMClient. + **/ +EggSMClient * +egg_sm_client_get (void) +{ + if (!global_client) + { + if (global_client_mode != EGG_SM_CLIENT_MODE_DISABLED && + !sm_client_disable) + { + /* If both D-Bus and XSMP are compiled in, try XSMP first + * (since it supports state saving) and fall back to D-Bus + * if XSMP isn't available. + */ +#ifdef EGG_SM_CLIENT_BACKEND_XSMP + global_client = egg_sm_client_xsmp_new (); +#endif +#ifdef EGG_SM_CLIENT_BACKEND_DBUS + if (!global_client) + global_client = egg_sm_client_dbus_new (); +#endif + } + + /* Fallback: create a dummy client, so that callers don't have + * to worry about a %NULL return value. + */ + if (!global_client) + global_client = g_object_new (EGG_TYPE_SM_CLIENT, NULL); + /*FIXME + Disabling when root/not in MATE in GtkApplication builds + as egg_sm_client_set_mode must be called prior to start of main loop + to stop caja restart but this is diffcult in GtkApplication */ + + if (geteuid () == 0 || !running_in_mate ()){ + global_client = g_object_new (EGG_TYPE_SM_CLIENT, NULL); + } + } + + return global_client; +} + +/** + * egg_sm_client_is_resumed: + * @client: the client + * + * Checks whether or not the current session has been resumed from + * a previous saved session. If so, the application should call + * egg_sm_client_get_state_file() and restore its state from the + * returned #GKeyFile. + * + * Return value: %TRUE if the session has been resumed + **/ +gboolean +egg_sm_client_is_resumed (EggSMClient *client) +{ + g_return_val_if_fail (client == global_client, FALSE); + + return sm_client_state_file != NULL; +} + +/** + * egg_sm_client_get_state_file: + * @client: the client + * + * If the application was resumed by the session manager, this will + * return the #GKeyFile containing its state from the previous + * session. + * + * Note that other libraries and #EggSMClient itself may also store + * state in the key file, so if you call egg_sm_client_get_groups(), + * on it, the return value will likely include groups that you did not + * put there yourself. (It is also not guaranteed that the first + * group created by the application will still be the "start group" + * when it is resumed.) + * + * Return value: the #GKeyFile containing the application's earlier + * state, or %NULL on error. You should not free this key file; it + * is owned by @client. + **/ +GKeyFile * +egg_sm_client_get_state_file (EggSMClient *client) +{ + EggSMClientPrivate *priv = EGG_SM_CLIENT_GET_PRIVATE (client); + char *state_file_path; + GError *err = NULL; + + g_return_val_if_fail (client == global_client, NULL); + + if (!sm_client_state_file) + return NULL; + if (priv->state_file) + return priv->state_file; + + if (!strncmp (sm_client_state_file, "file://", 7)) + state_file_path = g_filename_from_uri (sm_client_state_file, NULL, NULL); + else + state_file_path = g_strdup (sm_client_state_file); + + priv->state_file = g_key_file_new (); + if (!g_key_file_load_from_file (priv->state_file, state_file_path, 0, &err)) + { + g_warning ("Could not load SM state file '%s': %s", + sm_client_state_file, err->message); + g_clear_error (&err); + g_key_file_free (priv->state_file); + priv->state_file = NULL; + } + + g_free (state_file_path); + return priv->state_file; +} + +/** + * egg_sm_client_set_restart_command: + * @client: the client + * @argc: the length of @argv + * @argv: argument vector + * + * Sets the command used to restart @client if it does not have a + * .desktop file that can be used to find its restart command. + * + * This can also be used when handling the ::save_state signal, to + * save the current state via an updated command line. (Eg, providing + * a list of filenames to open when the application is resumed.) + **/ +void +egg_sm_client_set_restart_command (EggSMClient *client, + int argc, + const char **argv) +{ + g_return_if_fail (EGG_IS_SM_CLIENT (client)); + + if (EGG_SM_CLIENT_GET_CLASS (client)->set_restart_command) + EGG_SM_CLIENT_GET_CLASS (client)->set_restart_command (client, argc, argv); +} + +/** + * egg_sm_client_will_quit: + * @client: the client + * @will_quit: whether or not the application is willing to quit + * + * This MUST be called in response to the ::quit_requested signal, to + * indicate whether or not the application is willing to quit. The + * application may call it either directly from the signal handler, or + * at some later point (eg, after asynchronously interacting with the + * user). + * + * If the application does not connect to ::quit_requested, + * #EggSMClient will call this method on its behalf (passing %TRUE + * for @will_quit). + * + * After calling this method, the application should wait to receive + * either ::quit_cancelled or ::quit. + **/ +void +egg_sm_client_will_quit (EggSMClient *client, + gboolean will_quit) +{ + g_return_if_fail (EGG_IS_SM_CLIENT (client)); + + if (EGG_SM_CLIENT_GET_CLASS (client)->will_quit) + EGG_SM_CLIENT_GET_CLASS (client)->will_quit (client, will_quit); +} + +/** + * egg_sm_client_end_session: + * @style: a hint at how to end the session + * @request_confirmation: whether or not the user should get a chance + * to confirm the action + * + * Requests that the session manager end the current session. @style + * indicates how the session should be ended, and + * @request_confirmation indicates whether or not the user should be + * given a chance to confirm the logout/reboot/shutdown. Both of these + * flags are merely hints though; the session manager may choose to + * ignore them. + * + * Return value: %TRUE if the request was sent; %FALSE if it could not + * be (eg, because it could not connect to the session manager). + **/ +gboolean +egg_sm_client_end_session (EggSMClientEndStyle style, + gboolean request_confirmation) +{ + EggSMClient *client = egg_sm_client_get (); + + g_return_val_if_fail (EGG_IS_SM_CLIENT (client), FALSE); + + if (EGG_SM_CLIENT_GET_CLASS (client)->end_session) + { + return EGG_SM_CLIENT_GET_CLASS (client)->end_session (client, style, + request_confirmation); + } + else + return FALSE; +} + +/* Signal-emitting callbacks from platform-specific code */ + +GKeyFile * +egg_sm_client_save_state (EggSMClient *client) +{ + GKeyFile *state_file; + char *group; + + g_return_val_if_fail (client == global_client, NULL); + + state_file = g_key_file_new (); + + g_debug ("Emitting save_state"); + g_signal_emit (client, signals[SAVE_STATE], 0, state_file); + g_debug ("Done emitting save_state"); + + group = g_key_file_get_start_group (state_file); + if (group) + { + g_free (group); + return state_file; + } + else + { + g_key_file_free (state_file); + return NULL; + } +} + +void +egg_sm_client_quit_requested (EggSMClient *client) +{ + g_return_if_fail (client == global_client); + + if (!g_signal_has_handler_pending (client, signals[QUIT_REQUESTED], 0, FALSE)) + { + g_debug ("Not emitting quit_requested because no one is listening"); + egg_sm_client_will_quit (client, TRUE); + return; + } + + g_debug ("Emitting quit_requested"); + g_signal_emit (client, signals[QUIT_REQUESTED], 0); + g_debug ("Done emitting quit_requested"); +} + +void +egg_sm_client_quit_cancelled (EggSMClient *client) +{ + g_return_if_fail (client == global_client); + + g_debug ("Emitting quit_cancelled"); + g_signal_emit (client, signals[QUIT_CANCELLED], 0); + g_debug ("Done emitting quit_cancelled"); +} + +void +egg_sm_client_quit (EggSMClient *client) +{ + g_return_if_fail (client == global_client); + + g_debug ("Emitting quit"); + g_signal_emit (client, signals[QUIT], 0); + g_debug ("Done emitting quit"); + + /* FIXME: should we just call gtk_main_quit() here? */ +} + +static void +egg_sm_client_debug_handler (const char *log_domain, + GLogLevelFlags log_level, + const char *message, + gpointer user_data) +{ + static int debug = -1; + + if (debug < 0) + debug = (g_getenv ("EGG_SM_CLIENT_DEBUG") != NULL); + + if (debug) + g_log_default_handler (log_domain, log_level, message, NULL); +} |