#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
#include <linux/input.h>
#define DELAY 10
/* open file descriptor */
const int fd = KDE_open((char *) m_device.toUtf8().data(), O_RDONLY);
if (fd < 0) {
- fprintf(stderr, "Can't open Jog Shuttle FILE DESCRIPTOR\n");
+ perror("Can't open Jog Shuttle FILE DESCRIPTOR");
return;
}
/* reinit the timeout structure */
timeout.tv_sec = 0;
- timeout.tv_usec = 300000; /* 300 ms */
+ timeout.tv_usec = 400000; /* 400 ms */
- /* do the select */
+ /* do select in blocked mode and wake up after timeout for eval stop_me */
result = select(fd+1, &readset, NULL, NULL, &timeout);
- /* see if there was an error or timeout */
+ /* see if there was an error or timeout else process event */
if (result < 0) {
- // perror("select failed");
+ /* usually this is a condition for exit but EINTR error is sometimes
+ * thrown under special circumstances. I think its ok to ignore this
+ * if its not too often */
+ kDebug() << strerror(errno) << "\n";
} else if (result == 0) {
- //puts("TIMEOUT");
+ /* do nothing. reserved for future purposes */
} else {
/* we have input */
if (FD_ISSET(fd, &readset)) {
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 */
+ if (num_warnings % 10000 == 0) {
+ /* if device is not available anymore - dead or disconnected */
fprintf(stderr, "Failed to read event from Jog Shuttle FILE DESCRIPTOR (repeated %d times)\n", num_warnings + 1);
+ }
+ /* exit if device is not available or the error occurs to long */
+ if (errno == ENODEV) {
+ perror("Failed to read from Jog Shuttle FILE DESCRIPTOR. Stop thread");
+ /* stop thread */
+ stop_me = true;
+ } else if (num_warnings > 1000000) {
+ perror("Failed to read from Jog Shuttle FILE DESCRIPTOR. Limit reached. Stop thread");
+ /* stop thread */
+ stop_me = true;
+ }
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");
+ fprintf(stderr, "Can't set Jog Shuttle FILE DESCRIPTOR to O_NONBLOCK and stop thread\n");
stop_me = true;
}
}