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Date: Fri, 7 Jul 2017 12:03:39 -0400
Message-ID: <CAESVnVrqygTSR-WDVi8FFbFqgguT7eLR7prMMH-db-LVoc16zA@mail.gmail.com>
To: Martijn van Duren <php@list.imperialat.at>
Cc: Niklas Keller <me@kelunik.com>, Bob Weinand <bwoebi@php.net>, Kalle Sommer Nielsen <kalle@php.net>, 
	Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Getting fd from stream
From: pollita@php.net (Sara Golemon)

On Fri, Jul 7, 2017 at 11:04 AM, Martijn van Duren
<php@list.imperialat.at> wrote:
> On 07/07/17 16:38, Sara Golemon wrote:
> Yes, although tcp/ip are also possible with stream_socket_pair.
>
nit; socket_pair sockets are not AF_INET, they're just sockets.

> The point is, regardless of unix - or tcp sockets, they still have an
> underlying file descriptor, which I need to specify to the child, so
> that they can start using it. Ergo, I need to find a way to export this
> from the stream into PHP.
>
You misunderstand, I'm not saying to create a unix socket and try to
pass that open pair to the child.  I'm saying listen on a unix domain
socket on the file system and tell the children what the path is.
They can all individually then open streams to the parent using the
path.

Psuedo code:
// parent
$mysocket = 'unix://tmp/parent.sock';
$server = stream_socket_server($mysocket);
spawn_child('child_proc --sock='.escapeshellarg($mysocket));
$child = stream_socket_accept($server);
var_dump(fgets($child)); // string (8) "Hi mom!\n"

// child
$parentssocket = parseCliArg('sock');
$stream = stream_socket_client($parentssocket);
fwrite($stream, "Hi mom!\n");


Then the children can each report their own listening sockets to the
parent and the parent can provide a lookup for siblings to find each
other and allow them to open sockets to each other.

Trying to pass a meaningless number to the child that it can't do
anything with isn't going to work.
-Sara