- if (read(fd, &ev, sizeof(ev)) < 0) {
- if (num_warnings % 10000 == 0)
- fprintf(stderr, "Failed to read event from Jog Shuttle FILE DESCRIPTOR (repeated %d times)\n", num_warnings + 1);
- num_warnings++;
- }
- handle_event(ev);
+ /* reset the read set */
+ FD_ZERO(&readset);
+ FD_SET(fd, &readset);
+
+ /* reinit the timeout structure */
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 300000; /* 300 ms */
+
+ /* do the select */
+ result = select(fd+1, &readset, NULL, NULL, &timeout);
+
+ /* see if there was an error or timeout */
+ if (result < 0) {
+// perror("select failed");
+ } else if (result == 0) {
+// puts("TIMEOUT");
+ } else {
+ /* we have input */
+ if (FD_ISSET(fd, &readset)) {
+ /* get fd settings */
+ if ((iof = fcntl(fd, F_GETFL, 0)) != -1) {
+ /* set fd non blocking */
+ fcntl(fd, F_SETFL, iof | O_NONBLOCK);
+ /* read input */
+ if (read(fd, &ev, sizeof(ev)) < 0) {
+ if (num_warnings % 10000 == 0)
+ /* should not happen cause select called before */
+ fprintf(stderr, "Failed to read event from Jog Shuttle FILE DESCRIPTOR (repeated %d times)\n", num_warnings + 1);
+ num_warnings++;
+ }
+
+ /* restore settings */
+ if (iof != -1) {
+ fcntl(fd, F_SETFL, iof);
+ }
+ /* process event */
+ handle_event(ev);
+ } else {
+ fprintf(stderr, "Can't set Jog Shuttle FILE DESCRIPTOR to O_NONBLOCK\n");
+ stop_me = true;
+ }
+ }
+ }