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Date: Thu, 6 Jul 2017 20:01:54 +0200
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To: Sara Golemon <pollita@php.net>, Bob Weinand <bwoebi@php.net>
Cc: Kalle Sommer Nielsen <kalle@php.net>, Martijn van Duren <php@list.imperialat.at>, 
	Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Getting fd from stream
From: me@kelunik.com (Niklas Keller)

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>
> On Thu, Jul 6, 2017 at 10:53 AM, Kalle Sommer Nielsen <kalle@php.net>
> wrote:
> > 2017-07-06 11:12 GMT+02:00 Martijn van Duren <php@list.imperialat.at>:
> >> I have an (exotic) case where I need to be able to get the
> >> filedescriptor from a previously opened stream (via stream_socket_pair)
> >> to hand over to the child process, which needs to reexecute.
> >>
> >
> "hand over to a child process"
> Child as in pcntl_fork()? Or a subprocess via exec() et. al.?
>
> For the former, the variable should (I think) carry over.
> For the latter, the stream number is going to be a meaningless value
> to the subprocess. ((e.g. stdin (fd=0) for the parent is a different
> source than stdin for the child, despite being the same number)).
>
> I'm not sure of your exact use case, but you might be able to use
> proc_open to spawn the child and supply the socket in the descriptor
> spec which will (I think, iirc) bind the internal socket to a new pipe
> between the parent and child.  Though it's possible you'll need to
> maintain a proxy loop in the parent.
>
> 40% of the above is guesswork and conjecture, but maybe it'll spawn
> the right question.


There's a (I think undocumented) feature that allow transferring sockets to
other processes with the socket extension.

https://github.com/amphp/aerys/commit/40fae01e4f5f82570a0bc3cb8ebbf1fee36dbb0b

Bob implemented that, so maybe he can help you.

But what's your exact use case?

Regards, Niklas

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