pidgin/libpidgin.c

/*
 * pidgin
 *
 * Pidgin is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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 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., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 *
 */

#include <locale.h>
#include "internal.h"
#include "pidgin.h"

#include "account.h"
#include "conversation.h"
#include "core.h"
#include "debug.h"
#include "glibcompat.h"
#include "log.h"
#include "network.h"
#include "notify.h"
#include "options.h"
#include "prefs.h"
#include "protocol.h"
#include "pounce.h"
#include "sound.h"
#include "status.h"
#include "util.h"
#include "whiteboard.h"
#include "xfer.h"

#include "gtkaccount.h"
#include "gtkblist.h"
#include "gtkconn.h"
#include "gtkconv.h"
#include "gtkdialogs.h"
#include "gtkdocklet.h"
#include "gtkxfer.h"
#include "gtkidle.h"
#include "gtkmedia.h"
#include "gtknotify.h"
#include "gtkplugin.h"
#include "gtkpounce.h"
#include "gtkprefs.h"
#include "gtkprivacy.h"
#include "gtkrequest.h"
#include "gtkroomlist.h"
#include "gtksavedstatuses.h"
#include "gtksmiley-theme.h"
#include "gtksound.h"
#include "gtkutils.h"
#include "pidginstock.h"
#include "gtkwhiteboard.h"
#include "pidgindebug.h"
#include "pidginlog.h"

#ifndef _WIN32
#include <signal.h>
#endif

#ifndef _WIN32

/*
 * Lists of signals we wish to catch and those we wish to ignore.
 * Each list terminated with -1
 */
static const int catch_sig_list[] = {
	SIGSEGV,
	SIGINT,
	SIGTERM,
	SIGQUIT,
	SIGCHLD,
	-1
};

static const int ignore_sig_list[] = {
	SIGPIPE,
	-1
};
#endif /* !_WIN32 */

static void
dologin_named(const char *name)
{
	PurpleAccount *account;
	char **names;
	int i;

	if (name != NULL) { /* list of names given */
		names = g_strsplit(name, ",", 64);
		for (i = 0; names[i] != NULL; i++) {
			account = purple_accounts_find(names[i], NULL);
			if (account != NULL) { /* found a user */
				purple_account_set_enabled(account, PIDGIN_UI, TRUE);
			}
		}
		g_strfreev(names);
	} else { /* no name given, use the first account */
		GList *accounts;

		accounts = purple_accounts_get_all();
		if (accounts != NULL)
		{
			account = (PurpleAccount *)accounts->data;
			purple_account_set_enabled(account, PIDGIN_UI, TRUE);
		}
	}
}

#ifndef _WIN32
static char *segfault_message;

static guint signal_channel_watcher;

static int signal_sockets[2];

static void sighandler(int sig);

static void sighandler(int sig)
{
	ssize_t written;

	/*
	 * We won't do any of the heavy lifting for the signal handling here
	 * because we have no idea what was interrupted.  Previously this signal
	 * handler could result in some calls to malloc/free, which can cause
	 * deadlock in libc when the signal handler was interrupting a previous
	 * malloc or free.  So instead we'll do an ugly hack where we write the
	 * signal number to one end of a socket pair.  The other half of the
	 * socket pair is watched by our main loop.  When the main loop sees new
	 * data on the socket it reads in the signal and performs the appropriate
	 * action without fear of interrupting stuff.
	 */
	if (sig == SIGSEGV) {
		fprintf(stderr, "%s", segfault_message);
		abort();
		return;
	}

	written = write(signal_sockets[0], &sig, sizeof(int));
	if (written < 0 || written != sizeof(int)) {
		/* This should never happen */
		purple_debug_error("sighandler", "Received signal %d but only "
				"wrote %" G_GSSIZE_FORMAT " bytes out of %"
				G_GSIZE_FORMAT ": %s\n",
				sig, written, sizeof(int), g_strerror(errno));
		exit(1);
	}
}

static gboolean
mainloop_sighandler(GIOChannel *source, GIOCondition cond, gpointer data)
{
	GIOStatus stat;
	int sig;
	gsize bytes_read;
	GError *error = NULL;

	/* read the signal number off of the io channel */
	stat = g_io_channel_read_chars(source, (gchar *)&sig, sizeof(int),
			&bytes_read, &error);
	if (stat != G_IO_STATUS_NORMAL) {
		purple_debug_error("sighandler", "Signal callback failed to read "
				"from signal socket: %s", error->message);
		purple_core_quit();
		return FALSE;
	}

	switch (sig) {
		case SIGCHLD:
			/* Restore signal catching */
			signal(SIGCHLD, sighandler);
			break;
		default:
			purple_debug_warning("sighandler", "Caught signal %d\n", sig);
			purple_core_quit();
	}

	return TRUE;
}
#endif /* !_WIN32 */

static int
ui_main(void)
{
	pidgin_blist_setup_sort_methods();

	gtk_window_set_default_icon_name("pidgin");

	return 0;
}

static void
debug_init(void)
{
	PidginDebugUi *ui = pidgin_debug_ui_new();
	purple_debug_set_ui(PURPLE_DEBUG_UI(ui));
}

static void
pidgin_ui_init(void)
{
	gchar *path;

	path = g_build_filename(PURPLE_DATADIR, "pidgin", "icons", NULL);
	gtk_icon_theme_append_search_path(gtk_icon_theme_get_default(), path);
	g_free(path);

	pidgin_stock_init();

	/* Set the UI operation structures. */
	purple_accounts_set_ui_ops(pidgin_accounts_get_ui_ops());
	purple_xfers_set_ui_ops(pidgin_xfers_get_ui_ops());
	purple_blist_set_ui_ops(pidgin_blist_get_ui_ops());
	purple_notify_set_ui_ops(pidgin_notify_get_ui_ops());
	purple_request_set_ui_ops(pidgin_request_get_ui_ops());
	purple_sound_set_ui_ops(pidgin_sound_get_ui_ops());
	purple_connections_set_ui_ops(pidgin_connections_get_ui_ops());
	purple_whiteboard_set_ui_ops(pidgin_whiteboard_get_ui_ops());
	purple_idle_set_ui_ops(pidgin_idle_get_ui_ops());

	pidgin_accounts_init();
	pidgin_connection_init();
	pidgin_request_init();
	pidgin_blist_init();
	pidgin_status_init();
	pidgin_conversations_init();
	pidgin_pounces_init();
	pidgin_privacy_init();
	pidgin_xfers_init();
	pidgin_roomlist_init();
	pidgin_log_init();
	pidgin_docklet_init();
	_pidgin_smiley_theme_init();
	pidgin_utils_init();
	pidgin_medias_init();
	pidgin_notify_init();
}

static GHashTable *ui_info = NULL;

static void
pidgin_quit(void)
{
	/* Uninit */
	PurpleDebugUi *ui;

	pidgin_utils_uninit();
	pidgin_notify_uninit();
	_pidgin_smiley_theme_uninit();
	pidgin_conversations_uninit();
	pidgin_status_uninit();
	pidgin_docklet_uninit();
	pidgin_blist_uninit();
	pidgin_request_uninit();
	pidgin_connection_uninit();
	pidgin_accounts_uninit();
	pidgin_xfers_uninit();
	ui = purple_debug_get_ui();
	purple_debug_set_ui(NULL);
	g_object_unref(ui);

	if(NULL != ui_info)
		g_hash_table_destroy(ui_info);

	/* and end it all... */
	g_application_quit(g_application_get_default());
}

static GHashTable *pidgin_ui_get_info(void)
{
	if(NULL == ui_info) {
		ui_info = g_hash_table_new(g_str_hash, g_str_equal);

		g_hash_table_insert(ui_info, "name", (char*)PIDGIN_NAME);
		g_hash_table_insert(ui_info, "version", VERSION);
		g_hash_table_insert(ui_info, "website", "https://pidgin.im");
		g_hash_table_insert(ui_info, "dev_website", "https://developer.pidgin.im");
		g_hash_table_insert(ui_info, "client_type", "pc");

		/*
		 * prpl-aim-clientkey is a DevID (or "client key") for Pidgin, given to
		 * us by AOL in September 2016.  prpl-icq-clientkey is also a client key
		 * for Pidgin, owned by the AIM account "markdoliner."  Please don't use 
		 * either for other applications.  Instead, you can either not specify a 
		 * client key, in which case the default "libpurple" key will be used,
		 * or you can try to register your own at the AIM or ICQ web sites
		 * (although this functionality was removed at some point, it's possible 
		 * it has been re-added).
		 */
		g_hash_table_insert(ui_info, "prpl-aim-clientkey", "do1UCeb5gNqxB1S1");
		g_hash_table_insert(ui_info, "prpl-icq-clientkey", "ma1cSASNCKFtrdv9");

		/*
		 * prpl-aim-distid is a distID for Pidgin, given to us by AOL in
		 * September 2016.  prpl-icq-distid is also a distID for Pidgin, given
		 * to us by AOL.  Please don't use either for other applications.
		 * Instead, you can just not specify a distID and libpurple will use a
		 * default.
		 */
		g_hash_table_insert(ui_info, "prpl-aim-distid", GINT_TO_POINTER(1715));
		g_hash_table_insert(ui_info, "prpl-icq-distid", GINT_TO_POINTER(1550));
	}

	return ui_info;
}

static PurpleCoreUiOps core_ops =
{
	pidgin_prefs_init,
	debug_init,
	pidgin_ui_init,
	pidgin_quit,
	pidgin_ui_get_info,
	NULL,
	NULL,
	NULL,
	NULL
};

static PurpleCoreUiOps *
pidgin_core_get_ui_ops(void)
{
	return &core_ops;
}

static gint
pidgin_handle_local_options_cb(GApplication *app, GVariantDict *options,
		gpointer user_data)
{
#if !GLIB_CHECK_VERSION(2, 48, 0)
	gchar *app_id = NULL;
#endif

	if (g_variant_dict_contains(options, "version")) {
		printf("%s %s (libpurple %s)\n", PIDGIN_NAME, DISPLAY_VERSION,
		                                 purple_core_get_version());
		return 0;
	}

#if !GLIB_CHECK_VERSION(2, 48, 0)
	if (g_variant_dict_lookup(options, "gapplication-app-id",
			"s", &app_id)) {
		g_variant_dict_remove(options, "gapplication-app-id");
		g_application_set_application_id(app, app_id);
		g_free(app_id);
	}
#endif

	return -1;
}

static void
pidgin_activate_cb(GApplication *application, gpointer user_data)
{
	PidginBuddyList *blist = pidgin_blist_get_default_gtk_blist();

	if (blist != NULL && blist->window != NULL) {
		gtk_window_present(GTK_WINDOW(blist->window));
	}
}

static gint
pidgin_command_line_cb(GApplication *application,
		GApplicationCommandLine *cmdline, gpointer user_data)
{
	gchar **argv;
	int argc;
	int i;

	argv = g_application_command_line_get_arguments(cmdline, &argc);

	if (argc == 1) {
		/* No arguments, just activate */
		g_application_activate(application);
	}

	/* Start at 1 to skip the executable name */
	for (i = 1; i < argc; ++i) {
		purple_got_protocol_handler_uri(argv[i]);
	}

	g_strfreev(argv);

	return 0;
}

static gchar *opt_config_dir_arg = NULL;
static gboolean opt_nologin = FALSE;
static gboolean opt_login = FALSE;
static gchar *opt_login_arg = NULL;

static gboolean
login_opt_arg_func(const gchar *option_name, const gchar *value,
		gpointer data, GError **error)
{
	opt_login = TRUE;

	g_free(opt_login_arg);
	opt_login_arg = g_strdup(value);

	return TRUE;
}

static GOptionEntry option_entries[] = {
#if !GLIB_CHECK_VERSION(2, 48, 0)
	/* Support G_APPLICATION_CAN_OVERRIDE_APP_ID functionality
	 * even though we don't depend on version 2.48 yet
	 */
	{"gapplication-app-id", '\0', 0, G_OPTION_ARG_STRING, NULL,
		N_("Override the application's ID") },
#endif
	{"config", 'c', 0,
		G_OPTION_ARG_FILENAME, &opt_config_dir_arg,
		N_("use DIR for config files"), N_("DIR")},
	{"login", 'l', G_OPTION_FLAG_OPTIONAL_ARG,
		G_OPTION_ARG_CALLBACK, &login_opt_arg_func,
		N_("enable specified account(s) (optional argument NAME\n"
		  "                            "
		  "specifies account(s) to use, separated by commas.\n"
		  "                            "
		  "Without this only the first account will be enabled)"),
		N_("[NAME]")},
	{"nologin", 'n', 0,
		G_OPTION_ARG_NONE, &opt_nologin,
		N_("don't automatically login"), NULL},
	{"version", 'v', 0,
		G_OPTION_ARG_NONE, NULL,
		N_("display the current version and exit"), NULL},
	{NULL}
};

#ifndef _WIN32
static void
pidgin_setup_error_handler(void)
{
	int sig_indx;	/* for setting up signal catching */
	sigset_t sigset;
	char errmsg[BUFSIZ];
	GIOChannel *signal_channel;
	GIOStatus signal_status;
	GError *error = NULL;
#ifndef DEBUG
	char *segfault_message_tmp;

		/* We translate this here in case the crash breaks gettext. */
		segfault_message_tmp = g_strdup_printf(_(
			"%s %s has segfaulted and attempted to dump a core file.\n"
			"This is a bug in the software and has happened through\n"
			"no fault of your own.\n\n"
			"If you can reproduce the crash, please notify the developers\n"
			"by reporting a bug at:\n"
			"%ssimpleticket/\n\n"
			"Please make sure to specify what you were doing at the time\n"
			"and post the backtrace from the core file.  If you do not know\n"
			"how to get the backtrace, please read the instructions at\n"
			"%swiki/GetABacktrace\n"),
			PIDGIN_NAME, DISPLAY_VERSION, PURPLE_DEVEL_WEBSITE, PURPLE_DEVEL_WEBSITE
		);

		/* we have to convert the message (UTF-8 to console
		   charset) early because after a segmentation fault
		   it's not a good practice to allocate memory */
		segfault_message = g_locale_from_utf8(segfault_message_tmp,
						      -1, NULL, NULL, &error);
		if (segfault_message != NULL) {
			g_free(segfault_message_tmp);
		}
		else {
			/* use 'segfault_message_tmp' (UTF-8) as a fallback */
			g_warning("%s\n", error->message);
			g_clear_error(&error);
			segfault_message = segfault_message_tmp;
		}
#else
		/* Don't mark this for translation. */
		segfault_message = g_strdup(
			"Hi, user.  We need to talk.\n"
			"I think something's gone wrong here.  It's probably my fault.\n"
			"No, really, it's not you... it's me... no no no, I think we get along well\n"
			"it's just that.... well, I want to see other people.  I... what?!?  NO!  I \n"
			"haven't been cheating on you!!  How many times do you want me to tell you?!  And\n"
			"for the last time, it's just a rash!\n"
		);
#endif

	/*
	 * Create a socket pair for receiving unix signals from a signal
	 * handler.
	 */
	if (socketpair(AF_UNIX, SOCK_STREAM, 0, signal_sockets) < 0) {
		perror("Failed to create sockets for GLib signal handling");
		exit(1);
	}
	signal_channel = g_io_channel_unix_new(signal_sockets[1]);

	/*
	 * Set the channel encoding to raw binary instead of the default of
	 * UTF-8, because we'll be sending integers across instead of strings.
	 */
	signal_status = g_io_channel_set_encoding(signal_channel, NULL, &error);
	if (signal_status != G_IO_STATUS_NORMAL) {
		fprintf(stderr, "Failed to set the signal channel to raw "
				"binary: %s", error->message);
		g_clear_error(&error);
		exit(1);
	}
	signal_channel_watcher = g_io_add_watch(signal_channel, G_IO_IN, mainloop_sighandler, NULL);
	g_io_channel_unref(signal_channel);

	/* Let's not violate any PLA's!!!! */
	/* jseymour: whatever the fsck that means */
	/* Robot101: for some reason things like gdm like to block     *
	 * useful signals like SIGCHLD, so we unblock all the ones we  *
	 * declare a handler for. thanks JSeymour and Vann.            */
	if (sigemptyset(&sigset)) {
		snprintf(errmsg, sizeof(errmsg), "Warning: couldn't initialise empty signal set");
		perror(errmsg);
	}
	for(sig_indx = 0; catch_sig_list[sig_indx] != -1; ++sig_indx) {
		if(signal(catch_sig_list[sig_indx], sighandler) == SIG_ERR) {
			snprintf(errmsg, sizeof(errmsg), "Warning: couldn't set signal %d for catching",
				catch_sig_list[sig_indx]);
			perror(errmsg);
		}
		if(sigaddset(&sigset, catch_sig_list[sig_indx])) {
			snprintf(errmsg, sizeof(errmsg), "Warning: couldn't include signal %d for unblocking",
				catch_sig_list[sig_indx]);
			perror(errmsg);
		}
	}
	for(sig_indx = 0; ignore_sig_list[sig_indx] != -1; ++sig_indx) {
		if(signal(ignore_sig_list[sig_indx], SIG_IGN) == SIG_ERR) {
			snprintf(errmsg, sizeof(errmsg), "Warning: couldn't set signal %d to ignore",
				ignore_sig_list[sig_indx]);
			perror(errmsg);
		}
	}

	if (sigprocmask(SIG_UNBLOCK, &sigset, NULL)) {
		snprintf(errmsg, sizeof(errmsg), "Warning: couldn't unblock signals");
		perror(errmsg);
	}
}
#endif /* !_WIN32 */

static void
pidgin_startup_cb(GApplication *app, gpointer user_data)
{
	char *search_path;
	GtkCssProvider *provider;
	GdkScreen *screen;
	GList *accounts;
	gboolean gui_check;
	GList *active_accounts;
	GStatBuf st;
	GError *error = NULL;

	/* set a user-specified config directory */
	if (opt_config_dir_arg != NULL) {
		if (g_path_is_absolute(opt_config_dir_arg)) {
			purple_util_set_user_dir(opt_config_dir_arg);
		} else {
			/* Make an absolute (if not canonical) path */
			char *cwd = g_get_current_dir();
			char *path = g_build_path(G_DIR_SEPARATOR_S, cwd, opt_config_dir_arg, NULL);
			purple_util_set_user_dir(path);
			g_free(path);
			g_free(cwd);
		}
	}

	search_path = g_build_filename(purple_user_dir(), "gtk-3.0.css", NULL);

	provider = gtk_css_provider_new();
	gui_check = gtk_css_provider_load_from_path(provider, search_path, &error);

	if (gui_check && !error) {
		screen = gdk_screen_get_default();
		gtk_style_context_add_provider_for_screen(screen,
		                                          GTK_STYLE_PROVIDER(provider),
		                                          GTK_STYLE_PROVIDER_PRIORITY_USER);
	} else {
		purple_debug_error("gtk", "Unable to load custom gtk-3.0.css: %s\n",
		                   error ? error->message : "(unknown error)");
		g_clear_error(&error);
	}

	g_free(search_path);

#ifdef _WIN32
	winpidgin_init();
#endif

	purple_core_set_ui_ops(pidgin_core_get_ui_ops());

	if (!purple_core_init(PIDGIN_UI)) {
		fprintf(stderr,
				"Initialization of the libpurple core failed. Dumping core.\n"
				"Please report this!\n");
#ifndef _WIN32
		g_free(segfault_message);
#endif
		abort();
	}

	if (!g_getenv("PURPLE_PLUGINS_SKIP")) {
		search_path = g_build_filename(purple_user_dir(),
				"plugins", NULL);
		if (!g_stat(search_path, &st))
			g_mkdir(search_path, S_IRUSR | S_IWUSR | S_IXUSR);
		purple_plugins_add_search_path(search_path);
		g_free(search_path);

		purple_plugins_add_search_path(PIDGIN_LIBDIR);
	} else {
		purple_debug_info("gtk",
				"PURPLE_PLUGINS_SKIP environment variable "
				"set, skipping normal Pidgin plugin paths");
	}

	purple_plugins_refresh();

	/* load plugins we had when we quit */
	purple_plugins_load_saved(PIDGIN_PREFS_ROOT "/plugins/loaded");

	ui_main();

	g_free(opt_config_dir_arg);
	opt_config_dir_arg = NULL;

	/*
	 * We want to show the blist early in the init process so the
	 * user feels warm and fuzzy (not cold and prickley).
	 */
	purple_blist_show();

	if (purple_prefs_get_bool(PIDGIN_PREFS_ROOT "/debug/enabled"))
		pidgin_debug_window_show();

	if (opt_login) {
		/* disable all accounts */
		for (accounts = purple_accounts_get_all(); accounts != NULL; accounts = accounts->next) {
			PurpleAccount *account = accounts->data;
			purple_account_set_enabled(account, PIDGIN_UI, FALSE);
		}
		/* honor the startup status preference */
		if (!purple_prefs_get_bool("/purple/savedstatus/startup_current_status"))
			purple_savedstatus_activate(purple_savedstatus_get_startup());
		/* now enable the requested ones */
		dologin_named(opt_login_arg);
		g_free(opt_login_arg);
		opt_login_arg = NULL;
	} else if (opt_nologin)	{
		/* Set all accounts to "offline" */
		PurpleSavedStatus *saved_status;

		/* If we've used this type+message before, lookup the transient status */
		saved_status = purple_savedstatus_find_transient_by_type_and_message(
							PURPLE_STATUS_OFFLINE, NULL);

		/* If this type+message is unique then create a new transient saved status */
		if (saved_status == NULL)
			saved_status = purple_savedstatus_new(NULL, PURPLE_STATUS_OFFLINE);

		/* Set the status for each account */
		purple_savedstatus_activate(saved_status);
	} else {
		/* Everything is good to go--sign on already */
		if (!purple_prefs_get_bool("/purple/savedstatus/startup_current_status"))
			purple_savedstatus_activate(purple_savedstatus_get_startup());
		purple_accounts_restore_current_statuses();
	}

	if ((active_accounts = purple_accounts_get_all_active()) == NULL)
	{
		pidgin_accounts_window_show();
	}
	else
	{
		g_list_free(active_accounts);
	}

	/* GTK clears the notification for us when opening the first window,
	 * but we may have launched with only a status icon, so clear the it
	 * just in case. */
	gdk_notify_startup_complete();

#ifdef _WIN32
	winpidgin_post_init();
#endif

	/* TODO: Use GtkApplicationWindow or add a window instead */
	g_application_hold(app);
}

int pidgin_start(int argc, char *argv[])
{
	GApplication *app;
	int ret;

#ifdef DEBUG
	purple_debug_set_enabled(TRUE);
#endif

	bindtextdomain(PACKAGE, PURPLE_LOCALEDIR);
	bind_textdomain_codeset(PACKAGE, "UTF-8");
	textdomain(PACKAGE);

	/* Locale initialization is not complete here.  See gtk_init_check() */
	setlocale(LC_ALL, "");

#ifndef _WIN32
	pidgin_setup_error_handler();
#endif

	app = G_APPLICATION(gtk_application_new("im.pidgin.Pidgin",
#if GLIB_CHECK_VERSION(2, 48, 0)
				G_APPLICATION_CAN_OVERRIDE_APP_ID |
#endif
				G_APPLICATION_HANDLES_COMMAND_LINE));

	g_application_add_main_option_entries(app, option_entries);
	g_application_add_option_group(app, purple_get_option_group());
	g_application_add_option_group(app, gplugin_get_option_group());

	g_object_set(app, "register-session", TRUE, NULL);

	g_signal_connect(app, "handle-local-options",
			G_CALLBACK(pidgin_handle_local_options_cb), NULL);
	g_signal_connect(app, "startup",
			G_CALLBACK(pidgin_startup_cb), NULL);
	g_signal_connect(app, "activate",
			G_CALLBACK(pidgin_activate_cb), NULL);
	g_signal_connect(app, "command-line",
			G_CALLBACK(pidgin_command_line_cb), NULL);

	ret = g_application_run(app, argc, argv);

	/* Make sure purple has quit in case something in GApplication
	 * has caused g_application_run() to finish on its own. This can
	 * happen, for example, if the desktop session is ending.
	 */
	if (purple_get_core() != NULL) {
		purple_core_quit();
	}

	if (g_application_get_is_registered(app) &&
			g_application_get_is_remote(app)) {
		g_printerr(_("Exiting because another libpurple client is "
				"already running.\n"));
	}

	/* Now that we're sure purple_core_quit() has been called,
	 * this can be freed.
	 */
	g_object_unref(app);

#ifndef _WIN32
	g_free(segfault_message);
	g_source_remove(signal_channel_watcher);
	close(signal_sockets[0]);
	close(signal_sockets[1]);
#endif

#ifdef _WIN32
	winpidgin_cleanup();
#endif

	return ret;
}