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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 <linus.walleij@linaro.org>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Linus Walleij 2015-08-11 14:34:38 +02:00 committed by Jonathan Cameron
parent a0175b9c76
commit 672f93b604
1 changed files with 5 additions and 1 deletions
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6
tools/iio/iio_event_monitor.c
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@ -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");