diff --git a/zeromq/hwserver.c b/zeromq/hwserver.c
index 1401470..3e9cea2 100644
--- a/zeromq/hwserver.c
+++ b/zeromq/hwserver.c
@@ -1,17 +1,21 @@
 #include <zmq.h>
 #include <stdio.h>
+#include <sys/types.h>
 #include <unistd.h>
 #include <string.h>
 
+#define BIND_ADDR "tcp://*:5555"
+
 int main(void)
 {
     void *context = zmq_init(1);
 
     void *responder = zmq_socket(context, ZMQ_REP);
-	printf("Binding server to tcp://*:5555\n");
-    zmq_bind(responder, "tcp://*:5555");
+    printf("Binding server to %s\n", BIND_ADDR);
+    printf("pid=%d\n", getpid());
+    zmq_bind(responder, BIND_ADDR);
 
-	printf("Starting loop.\n");
+    printf("Starting loop.\n");
     while(1) {
         zmq_msg_t request;
         zmq_msg_init(&request);