liblog: reject empty logging messages

A regression after "liblog: Instrument logging of logd write drops"
where an empty payload would result in an insufficient iovec to
report the write drop.

Change-Id: Iffabcfbb0680898d7a42004700e638e9d940ff5f

parent 928cbdd2

liblog/logd_write.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -178,6 +178,10 @@ static int __write_to_log_daemon(log_id_t log_id, struct iovec *vec, size_t nr)
		static pid_t last_pid = (pid_t) -1;
		static atomic_int_fast32_t dropped;

		if (!nr) {
		return -EINVAL;
		}

		if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
		last_uid = getuid();
		}