+static
+int wait_on_file(const char *path)
+{
+ int ret;
+ struct stat buf;
+
+ if (!path) {
+ return -1;
+ }
+
+ for (;;) {
+ ret = stat(path, &buf);
+ if (ret == -1 && errno == ENOENT) {
+ ret = poll(NULL, 0, 10); /* 10 ms delay */
+ /* Should return 0 everytime */
+ if (ret) {
+ if (ret < 0) {
+ perror("perror");
+ } else {
+ fprintf(stderr,
+ "poll return value is larger than zero\n");
+ }
+ return -1;
+ }
+ continue; /* retry */
+ }
+ if (ret) {
+ perror("stat");
+ return -1;
+ }
+ break; /* found */
+ }
+
+ return 0;
+}
+
+static struct option long_options[] =
+{
+ /* These options set a flag. */
+ {"iter", required_argument, 0, 'i'},
+ {"wait", required_argument, 0, 'w'},
+ {"sync-after-first-event", required_argument, 0, 'a'},
+ {"sync-before-last-event", required_argument, 0, 'b'},
+ {0, 0, 0, 0}
+};
+