AF_ARP missing

[Antonio Huete Jiménez]

Hi,

We don't have defined AF_ARP in `sys/socket.h`. FreeBSD and NetBSD do  
have it defined.
According to the information I've found it is (or can be) used for  
rfc826 and rfc903.

I have found two commits in FreeBSD related to this [1][2].
Also two commits in NetBSD [3][4].

Linux and OpenBSD do not have it defined either.

Please share your thoughts.

Regards,
Antonio Huete

--

[1]  
https://github.com/freebsd/freebsd-src/commit/cc4ca9da19ccf0742229052c965285c75e56b913
[2]  
https://github.com/freebsd/freebsd-src/commit/4fb3a8208cf96df2a43eca52a11cbe339419e3a9
[3]  
https://github.com/NetBSD/src/commit/6ce0c831cef0a3ae078d372d51140d5fcf941f3d
[4]  
https://github.com/NetBSD/src/commit/533219e23025a774ff517851615d76ba511f0263