On 4 Aug 1999, Assar Westerlund wrote:
> "Brian F. Feldman" <gr...@freebsd.org> writes:
> > On Tue, 3 Aug 1999, Mike Smith wrote:
> > >
> > > Actually, with interfaces like this you should generally pass a pointer
> > > to the structure in userspace, and stick a version number constant in
> > > the beginning of the structure. The size is often not enough of a
> > > determining factor...
> >
> > Actually, the structure shouldn't change size because it should be
> > using a sockaddr.
>
> No, because sizeof(struct sockaddr) < sizeof(struct sockaddr_in6).
> This is kind of bad but that's the way it is. It would make sense to
> use a `struct sockaddr_storage' but I still think it's worthwhile and
> better to have a version number.
As I read it, sockaddr is a transparent type (overloaded, as it were).
So we would use something like:
struct jail {
...
struct sockaddr;
char [SOCK_MAXADDRLEN - sizeof(struct sockaddr)];
char [sizeof(int) - SOCK_MAXADDRLEN % sizeof(int)];/* padding */
...
}
>
> /assar
>
>
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