Function gnunet_sys::gpgrt_onclose

pub unsafe extern "C" fn gpgrt_onclose(
    stream: gpgrt_stream_t, 
    mode: c_int, 
    fnc: Option<unsafe extern "C" fn(arg1: gpgrt_stream_t, arg2: *mut c_void)>, 
    fnc_value: *mut c_void
) -> c_int