[syslog-ng]Strang behaviour of syslog-ng (and my program)

[Antai Ning]

Hi Bazsi, 

Thanks for your reply first of all!  And sorry for the second email in HTML
secondly. This one should be ok (I tested :-). Ok, let's go to the point.

I've never used strace but I'll try it. 

Yes, my program is using buffer and actually that's the first thing I
checked. But I'm pretty sure it's not there. 

This is somewhat related to pipe openning. If I make sure syslog-ng opens
the pipe before my program, then everything is OK. The code in my program is
something like this:
        . 
        . 
initializing 
        . 
        . 
while(1) 
{ 
        open pipe       #block here until syslog-ng open the pipe 
        while(1) 
        { 
                select on the pipe      #block here until the pipe is ready
for read or timeout (5 sec) 
                next if timeout 
                last if other side close the pipe       #jump out the loop
and try to open pipe again 
                
                read and process the message    #normal 
        } 
} 
                
Bazsi, you see anything wrong here? 
Thanks, 
Andy                              



-----Original Message----- 
From: Balazs Scheidler [mailto:bazsi@balabit.hu] 
Sent: Monday, July 15, 2002 10:59 AM 
To: syslog-ng@lists.balabit.hu 
Subject: Re: [syslog-ng]Strang behaviour of syslog-ng (and my program) 


On Mon, Jul 15, 2002 at 10:32:08AM -0400, Antai Ning wrote: 
> Hi Gents, 
>  
> I'm posting the question again because I really need an answer for it, 
>  
> Thanks a lot, 
can you check whether strace shows anything insane? 
are you using buffering in your perl program? 
syslog-ng uses a read/write pipe, and writes messages as soon as the pipe 
becomes writable. if the pipe is not writable (as indicated by poll), 
messages are buffered in a fifo, whose size is controlled by 
log_fifo_size(). 
-- 
Bazsi 
PGP info: KeyID 9AF8D0A9 Fingerprint CD27 CFB0 802C 0944 9CFD 804E C82C 8EB1

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