On Wed, 23 Jul 2003 09:32:09 -0400 (EDT)
David Korn [off-list ref] wrote:

[ Added netdev@oss.sgi.com, the proper place to discuss networking kernel issues. ]

The first problem is that files created with socketpair() are not accessible
via /dev/fd/n or /proc/$$/fd/n where n is the file descriptor returned
by socketpair().  Note that this is not a problem with pipe().

Not a bug.

Sockets are not openable via /proc files under any circumstances,
not just the circumstances you describe.  This is a policy decision and
prevents a whole slew of potential security holes.