%NULL-terminated array of #TpConnectionManager (the objects will be unreferenced and the array will be freed after the callback returns, so the callback must reference any CMs it stores a pointer to), or %NULL on error
number of connection managers in cms (not including the final %NULL)
%NULL on success, or an error that occurred
user-supplied weakly referenced object
Signature of the callback supplied to tp_list_connection_managers().
Since 0.11.3, tp_list_connection_managers() will wait for %TP_CONNECTION_MANAGER_FEATURE_CORE to be prepared on each connection manager passed to
callback,unless an error occurred while launching that connection manager.