+
+void exportmeshgraph_timer(int signum)
+{
+ struct timeval ts;
+ gettimeofday(&ts, NULL);
+
+ char name[1024];
+ snprintf(name, sizeof(name), "graph_%ld_%ld.json", ts.tv_sec, ts.tv_usec/1000);
+
+ exportmeshgraph(name);
+}
+
+static bool exportmeshgraph_started = false;
+
+static bool exportmeshgraph_end(const char* none)
+{
+ if(!exportmeshgraph_started)
+ { return false; }
+
+ struct itimerval zero_timer = { 0 };
+ setitimer (ITIMER_REAL, &zero_timer, NULL);
+
+ exportmeshgraph_started = false;
+
+ return true;
+}
+
+static bool exportmeshgraph_begin(const char* timeout_str)
+{
+ if(!timeout_str)
+ return false;
+
+ if(exportmeshgraph_started)
+ {
+ if(!exportmeshgraph_end(NULL))
+ return false;
+ }
+
+ // get timeout
+ int timeout = atoi(timeout_str);
+
+ if(timeout < 100)
+ { timeout = 100; }
+
+ int timeout_sec = timeout / 1000;
+ int timeout_msec = timeout % 1000;
+
+ /* Install timer_handler as the signal handler for SIGALRM. */
+ signal(SIGALRM, exportmeshgraph_timer);
+
+ /* Configure the timer to expire after X msec... */
+ struct itimerval timer;
+ timer.it_value.tv_sec = timeout_sec;
+ timer.it_value.tv_usec = timeout_msec * 1000;
+
+ /* ... and every X msec after that. */
+ timer.it_interval.tv_sec = timeout_sec;
+ timer.it_interval.tv_usec = timeout_msec * 1000;
+
+ /* Start a real timer. */
+ setitimer (ITIMER_REAL, &timer, NULL);
+
+ exportmeshgraph_started = true;
+
+ return true;
+}
+