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From: "K.V.S. Sankaram" <kasturi@teil.soft.net>
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1) When I am trying to use the BPF function in FREEBSD by including the header
   files, the compiler is showing parse errors in the header file. If that is
   the case then how come kernel compilation could succeed ?  Also, the FREEBSD
   tcpdump command, which uses BPF, is working fine.

2) Is not the function ftok() system call, used in SYSTEM V IPC, supported by
   FREEBSD ?  It is not present in any of the header files.