server: idle loop support

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.h b/server.h
index 4783238..494c326 100644
--- a/server.h
+++ b/server.h
@@ -80,7 +80,7 @@
 extern int fio_recv_data(int sk, void *p, unsigned int len);
 extern int fio_send_data(int sk, const void *p, unsigned int len);
 extern void fio_net_cmd_crc(struct fio_net_cmd *);
-extern struct fio_net_cmd *fio_net_recv_cmd(int sk);
+extern struct fio_net_cmd *fio_net_recv_cmd(int sk, int block);
 
 extern int exit_backend;
 extern int fio_net_port;