linux-kernel - Re: [PATCH 1/2] fs: introduce sendfd() syscall

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Date:	Fri, 5 Dec 2014 13:37:42 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Alex Dubov <alex.dubov@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alex Dubov <oakad@...oo.com>
Subject: Re: [PATCH 1/2] fs: introduce sendfd() syscall

On Wed, 3 Dec 2014 11:41:44 +0100
Richard Cochran <richardcochran@...il.com> wrote:

> On Wed, Dec 03, 2014 at 09:17:37AM +0100, Richard Weinberger wrote:
> > Come on guys, get a cup of coffee and relax a bit...
> 
> I am relaxed, especially after I had a good laugh reading this:
> 
>    On a less related note, I hope you will agree that the simpler
>    mechanism for this very in-demand feature is long overdue on Linux
>    (every man and his dog are passing fds around these days).
> 
> Really, in years and years of unix programming, I have not yet felt
> the need to pass a file descriptor. Thats goes double for my dogs.

Its underused in part because you need a pointy hat to do it in Unix, but
it's a very common model elsewhere.

Whether you need the syscall or just to write sendfd() acceptfd() in
terms of AF_UNIX sockets in a library and bury the icky bits is another
question. I think the reality is you'd probably end up doing the library
*anyway* to deal with the fact it'll be 5 or more years before sendfd
percolated everywhere even if it was merged today.

Alan
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