Subject: Re: IP_RECVIF addition
To: Dennis Ferguson <email@example.com>
From: Bill Fenner <firstname.lastname@example.org>
Date: 10/20/1996 18:06:04
In message <199610202116.OAA12953@skank.jnx.com> you write:
>Maybe the sockaddr could be pruned at four or eight bytes?
I'm uncomfortable with creating a 4-byte sockaddr_dl; I'd be afraid of
"generic" sockaddr_dl-handling code in a user program that assumes that
all of the sub-lengths are valid without checking the sockaddr length.
I'm happier with 8 bytes, but am not really sure how to come up with
the number 8. Perhaps <net/if_dl.h> needs
#define SDL_MINLEN 8 /* Minimum length sockaddr_dl */
since I don't think I'd want to use (sdl.sdl_data - (char *)&sdl) .