iio: event_monitor: report unsupported events

This makes the event monitor bail out with a helpful error message if a device does not support events, as a related fix to iio core now makes it return -ENODEV properly. Signed-off-by: Linus Walleij <[email protected]> Acked-by: Hartmut Knaack <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]>
tdeneau · Aug 16, 2015 · 672f93b · 672f93b
1 parent a0175b9
commit 672f93b
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
@@ -284,7 +284,11 @@ int main(int argc, char **argv)
 	ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
 	if (ret == -1 || event_fd == -1) {
 		ret = -errno;
-		fprintf(stderr, "Failed to retrieve event fd\n");
+		if (ret == -ENODEV)
+			fprintf(stderr,
+				"This device does not support events\n");
+		else
+			fprintf(stderr, "Failed to retrieve event fd\n");
 		if (close(fd) == -1)
 			perror("Failed to close character device file");