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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-bus.c Convenience functions for communicating with the bus.
*
* Copyright (C) 2003 CodeFactory AB
* Copyright (C) 2003 Red Hat, Inc.
*
* Licensed under the Academic Free License version 1.2
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "dbus-bus.h"
#include "dbus-protocol.h"
#include "dbus-internals.h"
/**
* @defgroup DBusBus Message bus APIs
* @ingroup DBus
* @brief Functions for communicating with the message bus
*
* @{
*/
/**
* Registers a connection with the bus. This must be the first
* thing an application does when connecting to the message bus.
*
* @todo if we get an error reply, it has to be converted into
* DBusError and returned
*
* @param connection the connection
* @param error place to store errors
* @returns the client's unique service name, #NULL on error
*/
char*
dbus_bus_register_client (DBusConnection *connection,
DBusError *error)
{
DBusMessage *message, *reply;
char *name;
message = dbus_message_new (DBUS_SERVICE_DBUS,
DBUS_MESSAGE_HELLO);
if (!message)
{
_DBUS_SET_OOM (error);
return NULL;
}
reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
dbus_message_unref (message);
if (reply == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return NULL;
}
if (!dbus_message_get_args (reply, error,
DBUS_TYPE_STRING, &name,
0))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return NULL;
}
return name;
}
/**
* Asks the bus to try to acquire a certain service.
*
* @todo these docs are not complete, need to document the
* return value and flags
*
* @todo if we get an error reply, it has to be converted into
* DBusError and returned
*
* @param connection the connection
* @param service_name the service name
* @param flags flags
* @param error location to store the error
* @returns a result code, -1 if error is set
*/
int
dbus_bus_acquire_service (DBusConnection *connection,
const char *service_name,
unsigned int flags,
DBusError *error)
{
DBusMessage *message, *reply;
int service_result;
message = dbus_message_new (DBUS_SERVICE_DBUS,
DBUS_MESSAGE_ACQUIRE_SERVICE);
if (message == NULL)
{
_DBUS_SET_OOM (error);
return -1;
}
if (!dbus_message_append_args (message,
DBUS_TYPE_STRING, service_name,
DBUS_TYPE_UINT32, flags,
0))
{
dbus_message_unref (message);
_DBUS_SET_OOM (error);
return -1;
}
reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
error);
dbus_message_unref (message);
if (reply == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return -1;
}
if (!dbus_message_get_args (reply, error,
DBUS_TYPE_UINT32, &service_result,
0))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return -1;
}
return service_result;
}
/**
* Checks whether a certain service exists.
*
* @todo the SERVICE_EXISTS message should use BOOLEAN not UINT32
*
* @param connection the connection
* @param service_name the service name
* @param error location to store any errors
* @returns #TRUE if the service exists, #FALSE if not or on error
*/
dbus_bool_t
dbus_bus_service_exists (DBusConnection *connection,
const char *service_name,
DBusError *error)
{
DBusMessage *message, *reply;
unsigned int exists;
message = dbus_message_new (DBUS_SERVICE_DBUS,
DBUS_MESSAGE_SERVICE_EXISTS);
if (message == NULL)
{
_DBUS_SET_OOM (error);
return FALSE;
}
if (!dbus_message_append_args (message,
DBUS_TYPE_STRING, service_name,
0))
{
dbus_message_unref (message);
_DBUS_SET_OOM (error);
return FALSE;
}
reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
dbus_message_unref (message);
if (reply == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return FALSE;
}
if (!dbus_message_get_args (reply, error,
DBUS_TYPE_UINT32, &exists,
0))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return FALSE;
}
return (exists != FALSE);
}
/** @} */
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