pub unsafe extern "C" fn kmod_set_log_fn( ctx: *mut kmod_ctx, log_fn: Option<unsafe extern "C" fn(log_data: *mut c_void, priority: c_int, file: *const c_char, line: c_int, fn_: *const c_char, format: *const c_char, args: *mut __va_list_tag)>, data: *const c_void)