+static bool exportmeshgraph(const char *path) {
+ assert(path);
+
+ struct stat ps;
+ int psr = stat(path, &ps);
+
+ if(psr == 0 || errno != ENOENT) {
+ if(psr == -1) {
+ perror("stat");
+ } else {
+ fprintf(stderr, "%s exists already\n", path);
+ }
+
+ return false;
+ }
+
+ FILE *stream = fopen(path, "w");
+
+ if(!stream) {
+ perror("stream");
+ return false;
+ }
+
+ if(!devtool_export_json_all_edges_state(mesh[0], stream)) {
+ fclose(stream);
+ fprintf(stderr, "could not export graph\n");
+ return false;
+ }
+
+ fclose(stream);
+ return true;
+}
+
+
+void exportmeshgraph_timer(int signum) {
+ (void)signum;
+
+ struct timeval ts;
+ gettimeofday(&ts, NULL);
+
+ char name[1024];
+ snprintf(name, sizeof(name), "%sgraph_%ld_%03ld.json", namesprefix, ts.tv_sec, ts.tv_usec / 1000);
+
+ exportmeshgraph(name);
+}
+
+#ifndef _WIN32
+static bool exportmeshgraph_started = false;
+
+static bool exportmeshgraph_end(void) {
+ if(!exportmeshgraph_started) {
+ return false;
+ }
+
+ struct itimerval zero_timer;
+
+ 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()) {
+ 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 immediately... */
+ struct itimerval timer;
+ timer.it_value.tv_sec = 0;
+ timer.it_value.tv_usec = 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;
+}
+#else
+static bool exportmeshgraph_end(void) {
+ return false;
+}
+
+static bool exportmeshgraph_begin(const char *timeout_str) {
+ return false;
+}
+#endif
+