[Klone-users] klone hangs up

[Stefano Barbato]

Hi,

KLone does not send such signal but the system will return EINTR if  
your read/write requests got interrupted somehow (for example SIGALRM  
timeouts that klone uses).

What you should do is re-call the read/write function when they fail  
and errno is EINTR:

--------------------
retry:
	n = write(fd, buf, size);
	if(n < 0 && errno == EINTR)
		goto retry;
--------------------

 From within KLone you could just use libu (out utility library that  
ships with klone) wrappers that gracefully handle EINTRs:
- u_read
- u_write
- u_accept
- u_sleep

bye!

s



On 16/lug/08, at 18:06, diakat 2000 wrote:

> Hi Stefano,
>
> I think that there are mixed different problems.
> Yes, in one case we had some empty C strings. This is resolved now.
>
> The other problem is the TCP/IP connection. After some testing and
> error handling now klone does not crash anymore.
> But I get EINTR (The receive was interrupted by delivery of a signal
> before any data were available.) sometimes I request data from the
> other program.
> Does klone send such signals?
>
> Many thanks!
>
>
>
>
> 2008/7/16 Stefano Barbato <barbato at koanlogic.com>:
>> Hi,
>>
>> I wasn't able to reproduce the problem; I created a new page (see  
>> below) for
>> testing that does nothing except calling sleep() and KLone keep it  
>> run the
>> script until I explicitly killed it after a few hours (actually I  
>> forgot
>> about it :) ).
>>
>>
>> ----[ hang.kl1 ]---
>> <%!
>> #include <unistd.h>
>> %><%
>> for(;;)
>>       sleep(1);
>> %>
>> -------------------
>>
>>
>> The behavior you wrote about could be seen, for example, if klone  
>> crashed
>> because of an error in getSomeData* functions. Do they always  
>> return valid C
>> strings? did you try to run the daemon under gdb?
>>
>> bye,
>> s
>>
>>
>>
>> On 15/lug/08, at 18:15, diakat 2000 wrote:
>>
>>> Hello,
>>>
>>> Many thanks for your speedy help!
>>>
>>> I use klone with iterative model.
>>> There are shown data on my web pages, which are coming per TCP/IP  
>>> from
>>> another program, e.g.:
>>>
>>> io_printf(out, myCommunicator->getSomeDataFromSocket());
>>> io_printf(out, myCommunicator->getSomeMoreDataFromSocket());
>>>
>>> At moment this communication is done per blocked functions send()  
>>> and
>>> recieve.
>>>
>>> The problem:
>>> If It takes some seconds, until the data from the sockets returned  
>>> to
>>> klone web page, the page reproduction stops.
>>> After a refresh of the page the klone-server is no longer available
>>> and klone must be restarted.
>>>
>>> Are there some timeouts, which have to been considered? Why klone  
>>> hangs
>>> up?
>>>
>>>
>>> Regards,
>>>
>>> _______________________________________________
>>> Klone-users mailing list
>>> Klone-users at koanlogic.com
>>> http://koanlogic.com/cgi-bin/mailman/listinfo/klone-users
>>>
>>
>>
>> _______________________________________________
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>
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