pipex_lookup_by_session_id_locked
session = pipex_lookup_by_session_id_locked(req->pcr_protocol,
if (pipex_lookup_by_session_id_locked(session->protocol,
session = pipex_lookup_by_session_id_locked(protocol, session_id);
struct pipex_session *pipex_lookup_by_session_id_locked (int, int);