Try using lsof, this tool could help you telling which fd are opened 
by a specific process:
    # lsof -i -n|grep PID


Peter Choe wrote:

> i have been getting an error on my FreeBSD 3.4 system which is running 
> tomcat 3.2.  after a while, i get a 'too many files open in system' 
> error and it freezes tomcat and the whole server.
>
> i looked at the ulimit on the system and it says that the file limit 
> is 1024.  i have no idea if this is too low normally.  it seems to be 
> too low for my usage.  i even went back to check my webapps to make 
> sure that i am close all the connections, but it seems that some 
> connections, files and databases, are being kept open.  is there 
> anyway to know which webapps are causing the problem?
>
>
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-- 

Rafael Angarita




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