docs/183333: Misnamed constant in bpf(4)

Sergey Kandaurov pluknet at
Sat Oct 26 16:50:02 UTC 2013

The following reply was made to PR docs/183333; it has been noted by GNATS.

From: Sergey Kandaurov <pluknet at>
To: Mats Erik Andersson <bsd at>
Cc: bug-followup at
Subject: Re: docs/183333: Misnamed constant in bpf(4)
Date: Sat, 26 Oct 2013 20:49:50 +0400

 The bpf(4) documentation states that the example is taken from the Reverse
 ARP Daemon.  rarpd is tightly coupled with BPF.  This macro is actually
 used there mapped to ARPOP_REVREQUEST.  From rarpd code snippet's p.o.v.
 this EXAMPLES is correct, but is not compilable as is without adding this
 mapping there.
 The REVARP_REQUEST localism is probably came from SunOS? (and RFC1931).
 This macro does not exist in net/if_arp.h (in any BSD except Solaris) and
 is/was probably used for source compatibility with SunOS.
 The ARPOP_REVREQUEST macro sits there since 1992 (4.4BSD).  SunOS took
 if_arp.h from UCB on 1/24/86 and added REVARP_REQUEST on its own.  It seems
 to not have ARPOP_REVREQUEST.
 wpaul modified rarpd.c in r19859 to use REVARP_REQUEST (it was
 ARPOP_REVREQUEST there originally r6823).  The bpf(4) man page came in with
 r5882 from 1.1.5, and it was REVARP_REQUEST there.  It was REVARP_REQUEST
 in rarpd as found in 4.3BSD-UWisc copyrighted by Sun Micro dated 86/02/05
 which is before 1992.

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