9.3.2 behavior - explain please

[Barry Margolin]

In article <f8pa2b$d1v$1 at sf1.isc.org>, Pavel Urban <urbanp at mlp.cz> 
wrote:

> Pavel Urban wrote:
>  > [root at dns ~]# lsof -i udp:53
>  > COMMAND  PID  USER   FD   TYPE   DEVICE SIZE NODE NAME
>  > named   6982 named   20u  IPv4 19672544       UDP dns.iol.cz:domain
>  > named   6982 named   22u  IPv4 19672546       UDP dns.iol.cz:domain
>  > named   6993 named   20u  IPv4 19672564       UDP dns.iol.cz:domain
>  > named   6993 named   21u  IPv4 19672566       UDP dns.iol.cz:domain
>  >
>  > Strange...
>  >
> 
> Huh... I can see it now. There were indeed two instances of named. How 
> could that happen I don't know... Thanks a lot!

That's very strange.  It's not supposed to be possible for multiple 
processes to bind to the same local address and UDP port.  Are you sure 
6993 and 6982 aren't threads of the same process?  On Linux, the PID 
identifies the thread, not the process.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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