From 672f93b6047cc724f002cf50a84f4e8155b86f12 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 11 Aug 2015 14:34:38 +0200 Subject: [PATCH] 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 Acked-by: Hartmut Knaack Signed-off-by: Jonathan Cameron --- tools/iio/iio_event_monitor.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c index cd3fd41b481d..d51eb04202e9 100644 --- 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"); -- 2.20.1