Re: [PATCH] iio: event_monitor: report unsupported events

[Hartmut Knaack <knaack.h@gmx.de>]

Linus Walleij schrieb am 11.08.2015 um 14:34:
> 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>
> ---
>  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");
>  
>