Re: pcap_dispatch error on AIX 5.3 ...

[Mehlam Shakir <mehlam2001 () yahoo com>]

More info related to this,
 
Linking ...
ld: 0711-224 WARNING: Duplicate symbol: ._GLOBAL__I_fc_softc
ld: 0711-224 WARNING: Duplicate symbol: ._GLOBAL__D_fc_softc
ld: 0711-224 WARNING: Duplicate symbol: fc_softc
ld: 0711-224 WARNING: Duplicate symbol: thread_creds_t
ld: 0711-224 WARNING: Duplicate symbol: _GLOBAL__F_fc_softc
ld: 0711-224 WARNING: Duplicate symbol: _GLOBAL__I_fc_softc
ld: 0711-224 WARNING: Duplicate symbol: _GLOBAL__D_fc_softc
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.

Our issue may be related to these warnings.  
Any idea?
 
Thanks,
 
- mel
 

----- Original Message ----
From: Mehlam Shakir <mehlam2001 () yahoo com>
To: tcpdump-workers () lists tcpdump org
Sent: Sunday, May 7, 2006 9:53:05 PM
Subject: [tcpdump-workers] pcap_dispatch error on AIX 5.3 ...


Hi all:

We are experiencing a bit of problem on AIX with our app that uses libpcap for packet capture.  It appears to be 
related to multi-threading since neither "tcpdump" nor our single-threaded test programs have any issues.

When we run our multi-threaded application we can't capture any packets and instead log the following error, 

05/ 7/2006 18:29:21 Debug       : pcap_dispatch error:: read: Bad file number


Using "lsof" we verified that /dev/bpf0 was open.

However, some majic happens when we run "truss -p <app_pid>".
With our application still running (previously NOT capturing pkts) it suddenly starts capturing packets normally even 
if truss is subsequently stopped.  Once we stop our application and restart we have the same issue until we start truss.

It seems truss initializes something (we can't figure out what) and makes our application work. 

Any idea what is happening here?  We will be happy to send more information.  

Also, we would prefer to use native libpcap (one that comes with AIX), but, tcpdump-workers have documented a list of 
issues on AIX 5.2 (which probably exist on AIX 5.3).  We need to support our app on both AIX 5.2 and 5.3.  What do you 
recommend, native AIX or a BSD release, 0.8.3?

Thanks,

- mel-
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