linux-kernel - Re: [PATCH] fs: fcntl, avoid undefined behaviour

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Message-ID: <e120880d-52b1-5129-199f-9add4c465f30@suse.cz>
Date:   Mon, 24 Oct 2016 13:34:15 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Jeff Layton <jlayton@...hat.com>,
        "J. Bruce Fields" <bfields@...ldses.org>
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fs: fcntl, avoid undefined behaviour

On 10/24/2016, 01:29 PM, Jeff Layton wrote:
> It looks like it lists this as a "may fail" case:
> 
>     http://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
> 
>     [EINVAL]
>         The cmd argument is F_SETOWN and the value of the argument
>         is not valid as a process or process group identifier.

Huh, my man 3p fcntl only lists [EDEADLK] at that point. (I have 2013
edition opposing to 2016 from the link above)

> IMO, returning an error here is the right thing to do. Either the
> application isn't checking for errors, in which case returning one won't
> matter, or it is, and they probably want to be informed that their
> F_SETOWN didn't do what they expected.

Ok, will do.

-- 
js
suse labs