From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-la0-f45.google.com ([209.85.215.45]:35798 "EHLO mail-la0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933981AbbHKMeu (ORCPT ); Tue, 11 Aug 2015 08:34:50 -0400 Received: by lahi9 with SMTP id i9so39620709lah.2 for ; Tue, 11 Aug 2015 05:34:42 -0700 (PDT) From: Linus Walleij To: Jonathan Cameron , linux-iio@vger.kernel.org Cc: Linus Walleij Subject: [PATCH] iio: event_monitor: report unsupported events Date: Tue, 11 Aug 2015 14:34:38 +0200 Message-Id: <1439296478-19567-1-git-send-email-linus.walleij@linaro.org> Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org 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 --- 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"); -- 2.4.3