Function jack_client_open_with_server_name 

pub unsafe fn jack_client_open_with_server_name(
    client_name: *const c_char,
    options: jack_options_t,
    status: *mut jack_status_t,
    server_name: *const c_char,
) -> *mut jack_client_t

Calls jack_client_open with JackServerName set, passing server_name as the variadic argument that option requires.