linux-kernel - Re: kdbus: add documentation

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Message-ID: <CANq1E4RjwCVEVT7031CeiKrNvRFkLBZc4-X1uKdrdzpf=EwJ+A@mail.gmail.com>
Date:	Sun, 30 Nov 2014 18:15:14 +0100
From:	David Herrmann <dh.herrmann@...il.com>
To:	Florian Weimer <fw@...eb.enyo.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: kdbus: add documentation

Hi

On Sun, Nov 30, 2014 at 10:02 AM, Florian Weimer <fw@...eb.enyo.de> wrote:
> * Greg Kroah-Hartman:
>
>> +7.4 Receiving messages
>
>> +Also, if the connection allowed for file descriptor to be passed
>> +(KDBUS_HELLO_ACCEPT_FD), and if the message contained any, they will be
>> +installed into the receiving process after the KDBUS_CMD_MSG_RECV ioctl
>> +returns. The receiving task is obliged to close all of them appropriately.
>
> 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.

Thanks
David
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