diff -r 4042bda8c980 -r 5f1f1a3e6636 examples/user/main.c
--- a/examples/user/main.c	Thu Oct 02 10:45:40 2008 +0000
+++ b/examples/user/main.c	Thu Oct 02 13:40:23 2008 +0000
@@ -4,15 +4,39 @@
  *
  ****************************************************************************/
 
+#include <unistd.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <signal.h>
+
 #include "ecrt.h"
 
 /****************************************************************************/
 
+static unsigned int sig_alarms = 0;
+static unsigned int user_alarms = 0;
+
+/****************************************************************************/
+
+void signal_handler(int signum) {
+    switch (signum) {
+        case SIGALRM:
+            sig_alarms++;
+            break;
+    }
+}
+
+/****************************************************************************/
+
 int main(int argc, char **argv)
 {
 	ec_master_t *master;
 	ec_domain_t *domain;
 	ec_slave_config_t *sc;
+    struct sigaction sa;
+    struct itimerval tv;
     
     master = ecrt_request_master(0);
 	if (!master)
@@ -26,8 +50,41 @@
     if (!sc)
         return -1;
 
+    if (ecrt_master_activate(master))
+        return -1;
+
+    sa.sa_handler = signal_handler;
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    if (sigaction(SIGALRM, &sa, 0)) {
+        fprintf(stderr, "Failed to install signal handler!\n");
+        return -1;
+    }
+
+    tv.it_interval.tv_sec = 0;
+    tv.it_interval.tv_usec = 10000;
+    tv.it_value.tv_sec = 0;
+    tv.it_value.tv_usec = 1;
+    if (setitimer(ITIMER_REAL, &tv, NULL)) {
+        fprintf(stderr, "Failed to start timer: %s\n", strerror(errno));
+        return 1;
+    }
+
 	while (1) {
-		sleep(1);
+        sleep(1);
+
+        while (sig_alarms != user_alarms) {
+
+#if 0
+            struct timeval t;
+            gettimeofday(&t, NULL);
+            printf("%u %u\n", t.tv_sec, t.tv_usec);
+#endif
+            ecrt_master_receive(master);
+            ecrt_master_send(master);
+
+            user_alarms++;
+        }
 	}
 
 	return 0;