Re: Libpcap and 32 bits binary compatibility with Linux x86_64

[Guy Harris <guy () alum mit edu>]

On Nov 6, 2009, at 3:09 AM, Jean-Louis Charton wrote:

> Is there any known issue running a 32 bits binary program that uses  
> libpcap on a
> x86_64 Linux system ?

Yes, if libpcap is using the memory-mapped interface, and your kernel  
doesn't support version 2 of that interface:

        http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517098

as version 1 isn't ILP32/LP64-independent.

I'm not sure the workaround patch:

        
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=30;filename=pcap-linux_tpacket_v1_workaround.patch;att=1;bug=517098

works on big-endian systems.  I'm also not sure what the right way  
would be for userland to inquire whether the kernel is ILP32 or LP64,  
to try to work around it in a byte-order-independent fashion (those  
are probably the two most likely programming models on Linux, although  
somebody might have a port to some weird 48-bit DSP or something such  
as that out there...).
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