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To: internals@lists.php.net, chobie <chobieee@gmail.com>
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Date: Wed, 03 Apr 2013 23:34:42 +0200
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Subject: Re: [PHP-DEV] how to determine errno on user space?
From: glopes@nebm.ist.utl.pt ("Gustavo Lopes")

On Tue, 02 Apr 2013 02:11:24 +0200, chobie <chobieee@gmail.com> wrote:

> Hi, I'm writing some socket client (fluentd client) with PHP and I have a
> question.
>
> I want to retry fwrite or some socket function when I met recoverable  
> errno (e.g, EAGAIN). but PHP does not have any function to determine  
> errno as far as I known.
>
> what is the correct way to handle errno?
> I'd like to write robust client with PHP but I don't have good idea to
> determine errno.
>

The sockets extension has socket_last_error() to get the errno value after  
the last operation on the passed in socket.

The stream functions don't really handle this in a consistent fashion. For  
instance, stream_socket_client() can take a parameter by reference where  
to write the errno value, but other functions do not give such information  
and can only inform the user about the specific error that occurred via  
the a warning, which is not very friendly for programatically extracting  
the cause. I'd recommend that you use the sockets extension, unless you  
need encryption.

As to your approach, I don't really like it. PHP does not have  
enumerations, and the approach of creating a very large number of classes  
for this purpose is unprecedented in the PHP codebase.

-- 
Gustavo Lopes