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From: Aleksa Sarai <cyphar@cyphar.com>
To: Eric Rannaud <eric.rannaud@gmail.com>
Cc: linux-api@vger.kernel.org, linux-man@vger.kernel.org
Subject: Re: clock_settime(2) error for non-settable clocks
Date: Sat, 21 Mar 2020 14:56:57 +1100
Message-ID: <20200321035657.6baexoov65dkpmsb@yavin.dot.cyphar.com> (raw)
In-Reply-To: <CA+zRj8U5_NaY4ZQXj9r=f58KcO3pq5k9HZt9KxRYHnOOk=e1WQ@mail.gmail.com>

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On 2020-03-20, Eric Rannaud <eric.rannaud@gmail.com> wrote:
> Should we update the manpage to more fully explain the range of
> possible errors or instead try to have more consistent errors? For
> syscalls, what's the backward-compatibility contract for errno values?

It's the same as everything else -- "if it breaks an existing
application, it's a regression". There was an infamous case of this
exact scenario happening (changing the errno returned from an ioctl
broke pulseaudio) in 2012[1].

[1]: https://lore.kernel.org/lkml/CA+55aFzX56kPPwSO97X=UyPaMzV5QRNG9ScN=nxnHFjmz=_8yA@mail.gmail.com/

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20 18:02 Eric Rannaud
2020-03-21  3:56 ` Aleksa Sarai [this message]
2020-03-26  8:37 ` Michael Kerrisk (man-pages)
2020-03-29 20:49   ` Michael Kerrisk (man-pages)
2020-04-02 11:48     ` Michael Kerrisk (man-pages)
2020-04-02 14:23       ` [PATCH 1/1] clock_getres.2: dynamic POSIX clock devices can return other errors Eric Rannaud
2020-04-02 19:55         ` Michael Kerrisk (man-pages)
2020-04-02 20:06         ` Eric Rannaud
2020-04-02 20:19           ` Michael Kerrisk (man-pages)
2020-04-02 20:49             ` Eric Rannaud
2020-04-02 20:50               ` Eric Rannaud
2020-04-03  7:02               ` Michael Kerrisk (man-pages)
2020-04-03 16:42                 ` Eric Rannaud
2020-04-02 14:29       ` clock_settime(2) error for non-settable clocks Eric Rannaud

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