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main.c
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main.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2006 Novell, Inc.
* Copyright (C) 2008 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <config.h>
#include <libintl.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <glib/gi18n.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-bindings.h>
#include <dbus/dbus-glib-lowlevel.h>
#include "gdm-signal-handler.h"
#include "gdm-log.h"
#include "gsm-util.h"
#include "gsm-manager.h"
#include "gsm-session-fill.h"
#include "gsm-store.h"
#include "gsm-xsmp-server.h"
#include "gsm-fail-whale-dialog.h"
#define GSM_DBUS_NAME "org.gnome.SessionManager"
static gboolean failsafe = FALSE;
static gboolean show_version = FALSE;
static gboolean debug = FALSE;
static gboolean please_fail = FALSE;
static DBusGProxy *bus_proxy = NULL;
static void shutdown_cb (gpointer data);
static void
on_bus_name_lost (DBusGProxy *bus_proxy,
const char *name,
gpointer data)
{
g_warning ("Lost name on bus: %s, exiting", name);
exit (1);
}
static gboolean
acquire_name_on_proxy (DBusGProxy *bus_proxy,
const char *name)
{
GError *error;
guint result;
gboolean res;
gboolean ret;
ret = FALSE;
if (bus_proxy == NULL) {
goto out;
}
error = NULL;
res = dbus_g_proxy_call (bus_proxy,
"RequestName",
&error,
G_TYPE_STRING, name,
G_TYPE_UINT, 0,
G_TYPE_INVALID,
G_TYPE_UINT, &result,
G_TYPE_INVALID);
if (! res) {
if (error != NULL) {
g_warning ("Failed to acquire %s: %s", name, error->message);
g_error_free (error);
} else {
g_warning ("Failed to acquire %s", name);
}
goto out;
}
if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
if (error != NULL) {
g_warning ("Failed to acquire %s: %s", name, error->message);
g_error_free (error);
} else {
g_warning ("Failed to acquire %s", name);
}
goto out;
}
/* register for name lost */
dbus_g_proxy_add_signal (bus_proxy,
"NameLost",
G_TYPE_STRING,
G_TYPE_INVALID);
dbus_g_proxy_connect_signal (bus_proxy,
"NameLost",
G_CALLBACK (on_bus_name_lost),
NULL,
NULL);
ret = TRUE;
out:
return ret;
}
static gboolean
acquire_name (void)
{
GError *error;
DBusGConnection *connection;
error = NULL;
connection = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
if (connection == NULL) {
gsm_util_init_error (TRUE,
"Could not connect to session bus: %s",
error->message);
return FALSE;
}
bus_proxy = dbus_g_proxy_new_for_name_owner (connection,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
&error);
if (error != NULL) {
gsm_util_init_error (TRUE,
"Could not connect to session bus: %s",
error->message);
return FALSE;
}
g_signal_connect_swapped (bus_proxy,
"destroy",
G_CALLBACK (shutdown_cb),
NULL);
if (! acquire_name_on_proxy (bus_proxy, GSM_DBUS_NAME) ) {
gsm_util_init_error (TRUE,
"%s",
"Could not acquire name on session bus");
return FALSE;
}
return TRUE;
}
static gboolean
signal_cb (int signo,
gpointer data)
{
int ret;
GsmManager *manager;
g_debug ("Got callback for signal %d", signo);
ret = TRUE;
switch (signo) {
case SIGFPE:
case SIGPIPE:
/* let the fatal signals interrupt us */
g_debug ("Caught signal %d, shutting down abnormally.", signo);
ret = FALSE;
break;
case SIGINT:
case SIGTERM:
manager = (GsmManager *)data;
gsm_manager_logout (manager, GSM_MANAGER_LOGOUT_MODE_FORCE, NULL);
/* let the fatal signals interrupt us */
g_debug ("Caught signal %d, shutting down normally.", signo);
ret = TRUE;
break;
case SIGHUP:
g_debug ("Got HUP signal");
ret = TRUE;
break;
case SIGUSR1:
g_debug ("Got USR1 signal");
ret = TRUE;
gdm_log_toggle_debug ();
break;
default:
g_debug ("Caught unhandled signal %d", signo);
ret = TRUE;
break;
}
return ret;
}
static void
shutdown_cb (gpointer data)
{
GsmManager *manager = (GsmManager *)data;
g_debug ("Calling shutdown callback function");
/*
* When the signal handler gets a shutdown signal, it calls
* this function to inform GsmManager to not restart
* applications in the off chance a handler is already queued
* to dispatch following the below call to gtk_main_quit.
*/
gsm_manager_set_phase (manager, GSM_MANAGER_PHASE_EXIT);
gtk_main_quit ();
}
static gboolean
require_dbus_session (int argc,
char **argv,
GError **error)
{
char **new_argv;
int i;
if (g_getenv ("DBUS_SESSION_BUS_ADDRESS"))
return TRUE;
/* Just a sanity check to prevent infinite recursion if
* dbus-launch fails to set DBUS_SESSION_BUS_ADDRESS
*/
g_return_val_if_fail (!g_str_has_prefix (argv[0], "dbus-launch"),
TRUE);
/* +2 for our new arguments, +1 for NULL */
new_argv = g_malloc (argc + 3 * sizeof (*argv));
new_argv[0] = "dbus-launch";
new_argv[1] = "--exit-with-session";
for (i = 0; i < argc; i++) {
new_argv[i + 2] = argv[i];
}
new_argv[i + 2] = NULL;
if (!execvp ("dbus-launch", new_argv)) {
g_set_error (error,
G_SPAWN_ERROR,
G_SPAWN_ERROR_FAILED,
"No session bus and could not exec dbus-launch: %s",
g_strerror (errno));
return FALSE;
}
/* Should not be reached */
return TRUE;
}
int
main (int argc, char **argv)
{
struct sigaction sa;
GError *error;
char *display_str;
GsmManager *manager;
GsmStore *client_store;
GsmXsmpServer *xsmp_server;
GdmSignalHandler *signal_handler;
static char **override_autostart_dirs = NULL;
static char *session_name = NULL;
static GOptionEntry entries[] = {
{ "autostart", 'a', 0, G_OPTION_ARG_STRING_ARRAY, &override_autostart_dirs, N_("Override standard autostart directories"), N_("AUTOSTART_DIR") },
{ "session", 0, 0, G_OPTION_ARG_STRING, &session_name, N_("Session to use"), N_("SESSION_NAME") },
{ "debug", 0, 0, G_OPTION_ARG_NONE, &debug, N_("Enable debugging code"), NULL },
{ "failsafe", 'f', 0, G_OPTION_ARG_NONE, &failsafe, N_("Do not load user-specified applications"), NULL },
{ "version", 0, 0, G_OPTION_ARG_NONE, &show_version, N_("Version of this application"), NULL },
/* Translators: the 'fail whale' is the black dialog we show when something goes seriously wrong */
{ "whale", 0, 0, G_OPTION_ARG_NONE, &please_fail, N_("Show the fail whale dialog for testing"), NULL },
{ NULL, 0, 0, 0, NULL, NULL, NULL }
};
/* Make sure that we have a session bus */
if (!require_dbus_session (argc, argv, &error)) {
gsm_util_init_error (TRUE, "%s", error->message);
}
bindtextdomain (GETTEXT_PACKAGE, LOCALE_DIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
textdomain (GETTEXT_PACKAGE);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
sigaction (SIGPIPE, &sa, 0);
error = NULL;
gtk_init_with_args (&argc, &argv,
(char *) _(" - the GNOME session manager"),
entries, GETTEXT_PACKAGE,
&error);
if (error != NULL) {
g_warning ("%s", error->message);
exit (1);
}
if (show_version) {
g_print ("%s %s\n", argv [0], VERSION);
exit (1);
}
if (please_fail) {
gsm_fail_whale_dialog_we_failed (TRUE, TRUE, NULL);
gtk_main ();
exit (1);
}
gdm_log_init ();
gdm_log_set_debug (debug);
/* Set DISPLAY explicitly for all our children, in case --display
* was specified on the command line.
*/
display_str = gdk_get_display ();
gsm_util_setenv ("DISPLAY", display_str);
g_free (display_str);
/* Some third-party programs rely on GNOME_DESKTOP_SESSION_ID to
* detect if GNOME is running. We keep this for compatibility reasons.
*/
gsm_util_setenv ("GNOME_DESKTOP_SESSION_ID", "this-is-deprecated");
client_store = gsm_store_new ();
xsmp_server = gsm_xsmp_server_new (client_store);
if (!acquire_name ()) {
gsm_fail_whale_dialog_we_failed (TRUE, TRUE, NULL);
gtk_main ();
exit (1);
}
manager = gsm_manager_new (client_store, failsafe);
signal_handler = gdm_signal_handler_new ();
gdm_signal_handler_add_fatal (signal_handler);
gdm_signal_handler_add (signal_handler, SIGFPE, signal_cb, NULL);
gdm_signal_handler_add (signal_handler, SIGHUP, signal_cb, NULL);
gdm_signal_handler_add (signal_handler, SIGUSR1, signal_cb, NULL);
gdm_signal_handler_add (signal_handler, SIGTERM, signal_cb, manager);
gdm_signal_handler_add (signal_handler, SIGINT, signal_cb, manager);
gdm_signal_handler_set_fatal_func (signal_handler, shutdown_cb, manager);
if (IS_STRING_EMPTY (session_name))
session_name = _gsm_manager_get_default_session (manager);
gsm_util_set_autostart_dirs (override_autostart_dirs);
if (!gsm_session_fill (manager, session_name)) {
gsm_util_init_error (TRUE, "Failed to load session \"%s\"", session_name ? session_name : "(null)");
}
gsm_xsmp_server_start (xsmp_server);
gsm_manager_start (manager);
gtk_main ();
if (xsmp_server != NULL) {
g_object_unref (xsmp_server);
}
if (manager != NULL) {
g_debug ("Unreffing manager");
g_object_unref (manager);
}
if (client_store != NULL) {
g_object_unref (client_store);
}
if (bus_proxy != NULL) {
g_object_unref (bus_proxy);
}
gdm_log_shutdown ();
return 0;
}