Re: [libmicrohttpd] upgrading and life cycle of sockets

[Christian Grothoff]

On 11/26/20 8:31 AM, José Bollo wrote:
> On Tue, 24 Nov 2020 23:12:43 +0100
> Christian Grothoff <grothoff@gnunet.org> wrote:
> 
>> On 11/24/20 4:50 PM, José Bollo wrote:
>>> What about if in some future an option to MHD_upgrade_action would
>>> enable to "extract" the socket? Something like:
>>>
>>>     MHD_upgrade_action (urh, MHD_UPGRADE_ACTION_OWN_SOCKET);
>>>
>>> with a clear semantic on the implications that it has on
>>> half-closing.  
>>
>> I'm not sure it's needed. What's wrong with dup()?
>>
> 
> Something is wrong with dup: it needs an other file descriptor,
> dividing by 2 the count of available connection.

For child processes, not really: you can even do the dup()ing only after
fork() if you manually clear the close-on-exec flag. So you don't need
any extra FDs if you do it 'just right'.

Besides, with epoll() and a proper ulimit setup, you virtually have no
limit on # connections these days anyway.

-Christian

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