/usr/include/sys/xattr.h (on linux anyway)
man setxattr

On FreeBSD it's /usr/include/sys/extattr.h

What Unix system are you using?

On 8/17/07, Douglas A. Gwyn <DAGwyn@null.net> wrote:
>
> What do you mean by "extended attributes"?
> I haven't noticed them on the Unix systems I use.
>