linux-kernel - Re: kdbus: add documentation

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Message-ID: <54BE0D56.5090301@gmail.com>
Date:	Tue, 20 Jan 2015 09:09:58 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Florian Weimer <fw@...eb.enyo.de>,
	David Herrmann <dh.herrmann@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>
CC:	mtk.manpages@...il.com, Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	Linux API <linux-api@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: kdbus: add documentation

Daniel,  David,

On 11/30/2014 06:23 PM, Florian Weimer wrote:
> * David Herrmann:
> 
>> On Sun, Nov 30, 2014 at 10:02 AM, Florian Weimer <fw@...eb.enyo.de> wrote:
>>> * Greg Kroah-Hartman:
>>>
>>>> +7.4 Receiving messages
> 
>>> What happens if this is not possible because the file descriptor limit
>>> of the processes would be exceeded?  EMFILE, and the message will not
>>> be received?
>>
>> The message is returned without installing the FDs. This is signaled
>> by EMFILE, but a valid pool offset.
> 
> Oh.  This is really surprising, so it needs documentation.  But it's
> probably better than the alternative (return EMFILE and leave the
> message stuck, so that you receive it immediately again—this behavior
> makes non-blocking accept rather difficult to use correctly).

So, was this point in the end explicitly documented? I not
obvious that it is documented in the revised kdbus.txt that
Greg K-H sent out 4 days ago.

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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