Blocks waiting for a client to connect to any of the sockets added to the listener.
Returns the Socket that was accepted.
source_object is not null it will be filled out with the source object specified when the
corresponding socket or address was added to the listener.
cancellable is not null, then the operation can be cancelled by triggering the cancellable
object from another thread. If the operation was cancelled, the error g_io_error_cancelled will be returned.
location where Object pointer will be stored, or null.
optional Cancellable object, null to ignore.
a Socket on success, null on error.