Re: ap_rwrite

[Mike O'Leary]

Chris,

Thanks for the info.  I assume that ap_rwrite is writing directly to the
client which you mention is bad.  What is the preferred method and why is
the ap_rwrite not preferred?  Pardon me, I'm a newb.

Thanks,
Mike

On Thu, May 29, 2008 at 4:52 PM, Chris Kukuchka <[EMAIL PROTECTED]>
wrote:

> Mike O'Leary wrote:
>
>> I was just wondering if the ap_rwrite call could return some value less
>> than the
>> number of bytes requested to be written.  I wanted to know if I need to
>> put
>> a loop around all of my ap_rwrite calls to verify that all the data is
>> sent.
>>
> Mike,
>
> In answer to your question, yes, a loop is in order.  Something like this:
>
> while (n_bytes > 0)
>   {
> int n = (ap_rwrite (data, n_bytes, r));
> if (n < 0)
>{
>  /* error writing to client */
>}
> n_bytes -= n;
> data += n;
>   }
>
> Further, keep in mind if you are writing an Apache 2 module, you should
> *not* be writing directly to the client.  Also, there may be a more specific
> mailing list available for questions regarding the ap* utilities.
>
> Chris Kukuchka
> Sequoia Group, Inc.
>
>
>
>

Re: ap_rwrite

[Samuel Gomez]

Hello Mike.

Two notes on your topic.

1.- In httpd.h there is a constant called MAX_STRING_LEN . Maybe is 
playing some role here. Did you notice if buffer printing gets cut just 
when exceeds the number of bytes defined in MAX_STRING_LEN ?


2.- For string printing, I use ap_rputs()
http://httpd.apache.org/dev/apidoc/apidoc_ap_rputs.html
Not based in any special reason. Simply it is the funcion I saw on some 
tutorials and I use it. Test it. I always use it for printing short 
strings, but maybe is useful also in your case.


Samuel



Mike O'Leary wrote:

Hello,

I am writing an Apache module using Apache 2.2.3 and, from what I
understand, the sockets are non-blocking.  My questions is about ap_rwrite
having the signature below:

AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r);

Is it possible that ap_rwrite returns some value less than nbyte, but not
-1?  This would mean that I would need to loop, passing some byte offset
into buf and reducing nbyte until all of the content was sent.  If it is not
possible for ap_rwrite to return some value less than nbyte other than -1,
is there some internal mechanism that is looking to enforce a specific
transfer rate and will time out and return -1 from ap_rwrite if this rate is
not achieved?  If this is not the case, then aren't the sockets blocking?

Thanks in advance!

-Mike