--- /dev/null
+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* dbus-gmain.c GLib main loop integration
+ *
+ * Copyright (C) 2002, 2003 CodeFactory AB
+ * Copyright (C) 2005 Red Hat, Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * 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 02110-1301 USA
+ *
+ * This file is based on dbus-gmain.c from dbus-glib with functions renamed
+ * and unnecessary code removed.
+ */
+
+#include <config.h>
+#include <dbus/dbus.h>
+#include "glib.h"
+#include <string.h>
+
+#include <libintl.h>
+#define _(x) dgettext (GETTEXT_PACKAGE, x)
+#define N_(x) x
+
+/**
+ * @defgroup DBusGLibInternals GLib bindings implementation details
+ * @ingroup DBusInternals
+ * @brief Implementation details of GLib bindings
+ *
+ * @{
+ */
+
+/**
+ * DBusGMessageQueue:
+ * A GSource subclass for dispatching DBusConnection messages.
+ * We need this on top of the IO handlers, because sometimes
+ * there are messages to dispatch queued up but no IO pending.
+ */
+typedef struct
+{
+ GSource source; /**< the parent GSource */
+ DBusConnection *connection; /**< the connection to dispatch */
+} DBusGMessageQueue;
+
+static gboolean message_queue_prepare (GSource *source,
+ gint *timeout);
+static gboolean message_queue_check (GSource *source);
+static gboolean message_queue_dispatch (GSource *source,
+ GSourceFunc callback,
+ gpointer user_data);
+
+static const GSourceFuncs message_queue_funcs = {
+ message_queue_prepare,
+ message_queue_check,
+ message_queue_dispatch,
+ NULL
+};
+
+static gboolean
+message_queue_prepare (GSource *source,
+ gint *timeout)
+{
+ DBusConnection *connection = ((DBusGMessageQueue *)source)->connection;
+
+ *timeout = -1;
+
+ return (dbus_connection_get_dispatch_status (connection) == DBUS_DISPATCH_DATA_REMAINS);
+}
+
+static gboolean
+message_queue_check (GSource *source)
+{
+ return FALSE;
+}
+
+static gboolean
+message_queue_dispatch (GSource *source,
+ GSourceFunc callback,
+ gpointer user_data)
+{
+ DBusConnection *connection = ((DBusGMessageQueue *)source)->connection;
+
+ dbus_connection_ref (connection);
+
+ /* Only dispatch once - we don't want to starve other GSource */
+ dbus_connection_dispatch (connection);
+
+ dbus_connection_unref (connection);
+
+ return TRUE;
+}
+
+typedef struct
+{
+ GMainContext *context; /**< the main context */
+ GSList *ios; /**< all IOHandler */
+ GSList *timeouts; /**< all TimeoutHandler */
+ DBusConnection *connection; /**< NULL if this is really for a server not a connection */
+ GSource *message_queue_source; /**< DBusGMessageQueue */
+} ConnectionSetup;
+
+
+typedef struct
+{
+ ConnectionSetup *cs;
+ GSource *source;
+ DBusWatch *watch;
+} IOHandler;
+
+typedef struct
+{
+ ConnectionSetup *cs;
+ GSource *source;
+ DBusTimeout *timeout;
+} TimeoutHandler;
+
+dbus_int32_t _dbus_gmain_connection_slot = -1;
+static dbus_int32_t server_slot = -1;
+
+static ConnectionSetup*
+connection_setup_new (GMainContext *context,
+ DBusConnection *connection)
+{
+ ConnectionSetup *cs;
+
+ cs = g_new0 (ConnectionSetup, 1);
+
+ g_assert (context != NULL);
+
+ cs->context = context;
+ g_main_context_ref (cs->context);
+
+ if (connection)
+ {
+ cs->connection = connection;
+
+ cs->message_queue_source = g_source_new ((GSourceFuncs *) &message_queue_funcs,
+ sizeof (DBusGMessageQueue));
+ ((DBusGMessageQueue*)cs->message_queue_source)->connection = connection;
+ g_source_attach (cs->message_queue_source, cs->context);
+ }
+
+ return cs;
+}
+
+static void
+io_handler_source_finalized (gpointer data)
+{
+ IOHandler *handler;
+
+ handler = data;
+
+ if (handler->watch)
+ dbus_watch_set_data (handler->watch, NULL, NULL);
+
+ g_free (handler);
+}
+
+static void
+io_handler_destroy_source (void *data)
+{
+ IOHandler *handler;
+
+ handler = data;
+
+ if (handler->source)
+ {
+ GSource *source = handler->source;
+ handler->source = NULL;
+ handler->cs->ios = g_slist_remove (handler->cs->ios, handler);
+ g_source_destroy (source);
+ g_source_unref (source);
+ }
+}
+
+static void
+io_handler_watch_freed (void *data)
+{
+ IOHandler *handler;
+
+ handler = data;
+
+ handler->watch = NULL;
+
+ io_handler_destroy_source (handler);
+}
+
+static gboolean
+io_handler_dispatch (GIOChannel *source,
+ GIOCondition condition,
+ gpointer data)
+{
+ IOHandler *handler;
+ guint dbus_condition = 0;
+ DBusConnection *connection;
+
+ handler = data;
+
+ connection = handler->cs->connection;
+
+ if (connection)
+ dbus_connection_ref (connection);
+
+ if (condition & G_IO_IN)
+ dbus_condition |= DBUS_WATCH_READABLE;
+ if (condition & G_IO_OUT)
+ dbus_condition |= DBUS_WATCH_WRITABLE;
+ if (condition & G_IO_ERR)
+ dbus_condition |= DBUS_WATCH_ERROR;
+ if (condition & G_IO_HUP)
+ dbus_condition |= DBUS_WATCH_HANGUP;
+
+ /* Note that we don't touch the handler after this, because
+ * dbus may have disabled the watch and thus killed the
+ * handler.
+ */
+ dbus_watch_handle (handler->watch, dbus_condition);
+ handler = NULL;
+
+ if (connection)
+ dbus_connection_unref (connection);
+
+ return TRUE;
+}
+
+/* Attach the connection setup to the given watch, removing any
+ * previously-attached connection setup.
+ */
+static void
+connection_setup_add_watch (ConnectionSetup *cs,
+ DBusWatch *watch)
+{
+ guint flags;
+ GIOCondition condition;
+ GIOChannel *channel;
+ IOHandler *handler;
+
+ if (!dbus_watch_get_enabled (watch))
+ return;
+
+ flags = dbus_watch_get_flags (watch);
+
+ condition = G_IO_ERR | G_IO_HUP;
+ if (flags & DBUS_WATCH_READABLE)
+ condition |= G_IO_IN;
+ if (flags & DBUS_WATCH_WRITABLE)
+ condition |= G_IO_OUT;
+
+ handler = g_new0 (IOHandler, 1);
+ handler->cs = cs;
+ handler->watch = watch;
+
+ channel = g_io_channel_unix_new (dbus_watch_get_unix_fd (watch));
+
+ handler->source = g_io_create_watch (channel, condition);
+ g_source_set_callback (handler->source, (GSourceFunc) io_handler_dispatch, handler,
+ io_handler_source_finalized);
+ g_source_attach (handler->source, cs->context);
+
+ cs->ios = g_slist_prepend (cs->ios, handler);
+
+ dbus_watch_set_data (watch, handler, io_handler_watch_freed);
+ g_io_channel_unref (channel);
+}
+
+static void
+connection_setup_remove_watch (ConnectionSetup *cs,
+ DBusWatch *watch)
+{
+ IOHandler *handler;
+
+ handler = dbus_watch_get_data (watch);
+
+ if (handler == NULL || handler->cs != cs)
+ return;
+
+ io_handler_destroy_source (handler);
+}
+
+static void
+timeout_handler_source_finalized (gpointer data)
+{
+ TimeoutHandler *handler;
+
+ handler = data;
+
+ if (handler->timeout)
+ dbus_timeout_set_data (handler->timeout, NULL, NULL);
+
+ g_free (handler);
+}
+
+static void
+timeout_handler_destroy_source (void *data)
+{
+ TimeoutHandler *handler;
+
+ handler = data;
+
+ if (handler->source)
+ {
+ GSource *source = handler->source;
+ handler->source = NULL;
+ handler->cs->timeouts = g_slist_remove (handler->cs->timeouts, handler);
+ g_source_destroy (source);
+ g_source_unref (source);
+ }
+}
+
+static void
+timeout_handler_timeout_freed (void *data)
+{
+ TimeoutHandler *handler;
+
+ handler = data;
+
+ handler->timeout = NULL;
+
+ timeout_handler_destroy_source (handler);
+}
+
+static gboolean
+timeout_handler_dispatch (gpointer data)
+{
+ TimeoutHandler *handler;
+
+ handler = data;
+
+ dbus_timeout_handle (handler->timeout);
+
+ return TRUE;
+}
+
+static void
+connection_setup_add_timeout (ConnectionSetup *cs,
+ DBusTimeout *timeout)
+{
+ TimeoutHandler *handler;
+
+ if (!dbus_timeout_get_enabled (timeout))
+ return;
+
+ g_assert (dbus_timeout_get_data (timeout) == NULL);
+
+ handler = g_new0 (TimeoutHandler, 1);
+ handler->cs = cs;
+ handler->timeout = timeout;
+
+ handler->source = g_timeout_source_new (dbus_timeout_get_interval (timeout));
+ g_source_set_callback (handler->source, timeout_handler_dispatch, handler,
+ timeout_handler_source_finalized);
+ g_source_attach (handler->source, handler->cs->context);
+
+ cs->timeouts = g_slist_prepend (cs->timeouts, handler);
+
+ dbus_timeout_set_data (timeout, handler, timeout_handler_timeout_freed);
+}
+
+static void
+connection_setup_remove_timeout (ConnectionSetup *cs,
+ DBusTimeout *timeout)
+{
+ TimeoutHandler *handler;
+
+ handler = dbus_timeout_get_data (timeout);
+
+ if (handler == NULL)
+ return;
+
+ timeout_handler_destroy_source (handler);
+}
+
+static void
+connection_setup_free (ConnectionSetup *cs)
+{
+ while (cs->ios)
+ io_handler_destroy_source (cs->ios->data);
+
+ while (cs->timeouts)
+ timeout_handler_destroy_source (cs->timeouts->data);
+
+ if (cs->message_queue_source)
+ {
+ GSource *source;
+
+ source = cs->message_queue_source;
+ cs->message_queue_source = NULL;
+
+ g_source_destroy (source);
+ g_source_unref (source);
+ }
+
+ g_main_context_unref (cs->context);
+ g_free (cs);
+}
+
+static dbus_bool_t
+add_watch (DBusWatch *watch,
+ gpointer data)
+{
+ ConnectionSetup *cs;
+
+ cs = data;
+
+ connection_setup_add_watch (cs, watch);
+
+ return TRUE;
+}
+
+static void
+remove_watch (DBusWatch *watch,
+ gpointer data)
+{
+ ConnectionSetup *cs;
+
+ cs = data;
+
+ connection_setup_remove_watch (cs, watch);
+}
+
+static void
+watch_toggled (DBusWatch *watch,
+ void *data)
+{
+ /* Because we just exit on OOM, enable/disable is
+ * no different from add/remove
+ */
+ if (dbus_watch_get_enabled (watch))
+ add_watch (watch, data);
+ else
+ remove_watch (watch, data);
+}
+
+static dbus_bool_t
+add_timeout (DBusTimeout *timeout,
+ void *data)
+{
+ ConnectionSetup *cs;
+
+ cs = data;
+
+ if (!dbus_timeout_get_enabled (timeout))
+ return TRUE;
+
+ connection_setup_add_timeout (cs, timeout);
+
+ return TRUE;
+}
+
+static void
+remove_timeout (DBusTimeout *timeout,
+ void *data)
+{
+ ConnectionSetup *cs;
+
+ cs = data;
+
+ connection_setup_remove_timeout (cs, timeout);
+}
+
+static void
+timeout_toggled (DBusTimeout *timeout,
+ void *data)
+{
+ /* Because we just exit on OOM, enable/disable is
+ * no different from add/remove
+ */
+ if (dbus_timeout_get_enabled (timeout))
+ add_timeout (timeout, data);
+ else
+ remove_timeout (timeout, data);
+}
+
+static void
+wakeup_main (void *data)
+{
+ ConnectionSetup *cs = data;
+
+ g_main_context_wakeup (cs->context);
+}
+
+
+/* Move to a new context */
+static ConnectionSetup*
+connection_setup_new_from_old (GMainContext *context,
+ ConnectionSetup *old)
+{
+ ConnectionSetup *cs;
+
+ g_assert (old->context != context);
+
+ cs = connection_setup_new (context, old->connection);
+
+ while (old->ios != NULL)
+ {
+ IOHandler *handler = old->ios->data;
+
+ connection_setup_add_watch (cs, handler->watch);
+ /* The old handler will be removed from old->ios as a side-effect */
+ }
+
+ while (old->timeouts != NULL)
+ {
+ TimeoutHandler *handler = old->timeouts->data;
+
+ connection_setup_add_timeout (cs, handler->timeout);
+ }
+
+ return cs;
+}
+
+/** @} */ /* End of GLib bindings internals */
+
+/** @addtogroup DBusGLib
+ * @{
+ */
+
+/**
+ * atspi_dbus_connection_setup_with_g_main:
+ * @connection: the connection
+ * @context: the #GMainContext or #NULL for default context
+ *
+ * Sets the watch and timeout functions of a #DBusConnection
+ * to integrate the connection with the GLib main loop.
+ * Pass in #NULL for the #GMainContext unless you're
+ * doing something specialized.
+ *
+ * If called twice for the same context, does nothing the second
+ * time. If called once with context A and once with context B,
+ * context B replaces context A as the context monitoring the
+ * connection.
+ */
+void
+atspi_dbus_connection_setup_with_g_main (DBusConnection *connection,
+ GMainContext *context)
+{
+ ConnectionSetup *old_setup;
+ ConnectionSetup *cs;
+
+ /* FIXME we never free the slot, so its refcount just keeps growing,
+ * which is kind of broken.
+ */
+ dbus_connection_allocate_data_slot (&_dbus_gmain_connection_slot);
+ if (_dbus_gmain_connection_slot < 0)
+ goto nomem;
+
+ if (context == NULL)
+ context = g_main_context_default ();
+
+ cs = NULL;
+
+ old_setup = dbus_connection_get_data (connection, _dbus_gmain_connection_slot);
+ if (old_setup != NULL)
+ {
+ if (old_setup->context == context)
+ return; /* nothing to do */
+
+ cs = connection_setup_new_from_old (context, old_setup);
+
+ /* Nuke the old setup */
+ dbus_connection_set_data (connection, _dbus_gmain_connection_slot, NULL, NULL);
+ old_setup = NULL;
+ }
+
+ if (cs == NULL)
+ cs = connection_setup_new (context, connection);
+
+ if (!dbus_connection_set_data (connection, _dbus_gmain_connection_slot, cs,
+ (DBusFreeFunction)connection_setup_free))
+ goto nomem;
+
+ if (!dbus_connection_set_watch_functions (connection,
+ add_watch,
+ remove_watch,
+ watch_toggled,
+ cs, NULL))
+ goto nomem;
+
+ if (!dbus_connection_set_timeout_functions (connection,
+ add_timeout,
+ remove_timeout,
+ timeout_toggled,
+ cs, NULL))
+ goto nomem;
+
+ dbus_connection_set_wakeup_main_function (connection,
+ wakeup_main,
+ cs, NULL);
+
+ return;
+
+ nomem:
+ g_error ("Not enough memory to set up DBusConnection for use with GLib");
+}
+
+/**
+ * atspi_dbus_server_setup_with_g_main:
+ * @server: the server
+ * @context: the #GMainContext or #NULL for default
+ *
+ * Sets the watch and timeout functions of a #DBusServer
+ * to integrate the server with the GLib main loop.
+ * In most cases the context argument should be #NULL.
+ *
+ * If called twice for the same context, does nothing the second
+ * time. If called once with context A and once with context B,
+ * context B replaces context A as the context monitoring the
+ * connection.
+ */
+void
+atspi_dbus_server_setup_with_g_main (DBusServer *server,
+ GMainContext *context)
+{
+ ConnectionSetup *old_setup;
+ ConnectionSetup *cs;
+
+ /* FIXME we never free the slot, so its refcount just keeps growing,
+ * which is kind of broken.
+ */
+ dbus_server_allocate_data_slot (&server_slot);
+ if (server_slot < 0)
+ goto nomem;
+
+ if (context == NULL)
+ context = g_main_context_default ();
+
+ cs = NULL;
+
+ old_setup = dbus_server_get_data (server, server_slot);
+ if (old_setup != NULL)
+ {
+ if (old_setup->context == context)
+ return; /* nothing to do */
+
+ cs = connection_setup_new_from_old (context, old_setup);
+
+ /* Nuke the old setup */
+ if (!dbus_server_set_data (server, server_slot, NULL, NULL))
+ goto nomem;
+ old_setup = NULL;
+ }
+
+ if (cs == NULL)
+ cs = connection_setup_new (context, NULL);
+
+ if (!dbus_server_set_data (server, server_slot, cs,
+ (DBusFreeFunction)connection_setup_free))
+ goto nomem;
+
+ if (!dbus_server_set_watch_functions (server,
+ add_watch,
+ remove_watch,
+ watch_toggled,
+ cs, NULL))
+ goto nomem;
+
+ if (!dbus_server_set_timeout_functions (server,
+ add_timeout,
+ remove_timeout,
+ timeout_toggled,
+ cs, NULL))
+ goto nomem;
+
+ return;
+
+ nomem:
+ g_error ("Not enough memory to set up DBusServer for use with GLib");
+}
projects / platform / upstream / at-spi2-core.git / commitdiff