a #GDBusMessage
flags affecting how the message is sent.
the timeout in milliseconds, -1 to use the default timeout or %G_MAXINT for no timeout
return location for serial number assigned to @message when sending it or %NULL
a #GCancellable or %NULL
a locked #GDBusMessage that is the reply to @message or %NULL if @error is set
GException on failure.
2.26
Synchronously sends @message to the peer represented by @connection and blocks the calling thread until a reply is received or the timeout is reached. See g_dbus_connection_send_message_with_reply() for the asynchronous version of this method.
Unless @flags contain the %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number will be assigned by @connection and set on @message via g_dbus_message_set_serial(). If @out_serial is not %NULL, then the serial number used will be written to this location prior to submitting the message to the underlying transport.
If @connection is closed then the operation will fail with %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed, the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
Note that @error is only set if a local in-process error occurred. That is to say that the returned #GDBusMessage object may be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use g_dbus_message_to_gerror() to transcode this to a #GError.
See this server[gdbus-server] and client[gdbus-unix-fd-client] for an example of how to use this low-level API to send and receive UNIX file descriptors.
Note that @message must be unlocked, unless @flags contain the %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.