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Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root [message #47440 is a reply to message #47439]

Fri, 10 August 2012 18:31

hpa
Messages: 38
Registered: January 2007

Member

On 08/10/2012 11:26 AM, Alan Cox wrote:
>> On that whole subject...
>>
>> Do we need a Unix domain socket equivalent to openat()?
>
> I don't think so. The name is just a file system indexing trick, it's not
> really the socket proper. It's little more than "ascii string with
> permissions attached" - indeed we also support an abstract name space
> which for a lot of uses is actually more convenient.
>

I don't really understand why Unix domain sockets is different than any
other pathname users in this sense. (Actually, I have never understood
why open() on a Unix domain socket doesn't give the equivalent of a
socket() + connect() -- it would make logical sense and would provide
additional functionality).

It would be different if the Unix domain sockets simply required an
absolute pathname (it is not just about the root, it is also about the
cwd, which is where the -at() functions come into play), but that is not
the case.

The abstract namespace is irrelevant for this, obviously.

> AF_UNIX between roots raises some interesting semantic questions when
> you begin passing file descriptors down them as well.

Why is that? A file descriptor carries all that information with it...

-hpa

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[Message index]

		[RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Stanislav Kinsbursky on Fri, 10 August 2012 12:57
		[RFC PATCH 2/2] SUNRPC: connect local transports with unix_stream_connect_root() helper By: Stanislav Kinsbursky on Fri, 10 August 2012 12:57
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: hpa on Fri, 10 August 2012 18:15
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Alan Cox on Fri, 10 August 2012 18:23
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: hpa on Fri, 10 August 2012 18:31
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Alan Cox on Fri, 10 August 2012 18:37
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: hpa on Fri, 10 August 2012 18:42
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: bfields on Fri, 10 August 2012 19:11
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Alan Cox on Fri, 10 August 2012 19:24
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: hpa on Fri, 10 August 2012 23:09
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Pavel Emelyanov on Sat, 11 August 2012 06:23
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Stanislav Kinsbursky on Sat, 11 August 2012 11:15
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: bfields on Mon, 13 August 2012 16:47
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Stanislav Kinsbursky on Mon, 13 August 2012 17:39
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: bfields on Mon, 13 August 2012 18:24
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Stanislav Kinsbursky on Tue, 14 August 2012 08:46
		Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root By: Stanislav Kinsbursky on Fri, 10 August 2012 18:50

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