Date: Wed, 02 Jul 2014 18:08:13 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Jakub Klama <jakub.klama@uj.edu.pl> Cc: src-committers@freebsd.org, Jakub Wojciech Klama <jceel@FreeBSD.org>, svn-src-user@freebsd.org Subject: Re: svn commit: r268163 - in user/jceel/soc2014_evdev/head/sys: conf dev/evdev Message-ID: <53B42E6D.3020305@selasky.org> In-Reply-To: <28a06d7587dc84e2e03928b8aa7a403f@uj.edu.pl> References: <201407021540.s62FePTQ029148@svn.freebsd.org> <53B428CD.6040402@selasky.org> <28a06d7587dc84e2e03928b8aa7a403f@uj.edu.pl>
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On 07/02/14 18:00, Jakub Klama wrote:
> On Wed, 02 Jul 2014 17:44:13 +0200, Hans Petter Selasky wrote:
>> On 07/02/14 17:40, Jakub Wojciech Klama wrote:
>>> +static int
>>> +uinput_poll(struct cdev *dev, int events, struct thread *td)
>>> +{
>>> + struct uinput_cdev_state *state;
>>> + int ret;
>>> + int revents = 0;
>>> +
>>> + debugf("cdev: poll by thread %d", td->td_tid);
>>> +
>>> + ret = devfs_get_cdevpriv((void **)&state);
>>> + if (ret != 0)
>>> + return (ret);
>>
>> Hi,
>>
>> In case of error "poll" returns POLLNVAL, I think.
>
> Hm... POLLNVAL or rather POLLERR?
>
Hi,
Search for POLLNVAL in "kern/sys_generic.c" and you'll see why.
POLLNVAL is used if the file descriptor is no longer valid. POLLERR is
something else.
--HPS
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