/* Loop for receiving commands via io_round() and acting on them. Exits with 1
* on "QUIT" command. In replay mode, exits with 0 on each non-"QUIT" command.
- * In play mode, processes incomming commands via obey_msg().
+ * Writes a "PONG" line to server output file on "PING" command. In play mode,
+ * processes further incomming commands via obey_msg(). Compares the first line
+ * of the file at world.path_out with world.server_test to ensure that the
+ * current server process has not been superseded by a new one.
*/
extern uint8_t io_loop();