introduce a SOL_LOCAL for unix-domain socket level socket options
as an alias of the current 0 used for these options, as in FreeBSD.

reviewed by many.

Enforce that getpeereid only returns success on AF_LOCAL sockets, instead
of returning garbage for other socket types.

Convert to new 2 clause license

Add a new socket option for unix domain sockets: LOCAL_PEEREID, to make
it possible to get the pid, euid and egid of the process at the remote
end at the time it did bind() or connect().

Add a new l

Add a new socket option for unix domain sockets: LOCAL_PEEREID, to make
it possible to get the pid, euid and egid of the process at the remote
end at the time it did bind() or connect().

Add a new libc function, getpeereid() to easily get at the euid and egid.
As a consequence, bump libc's minor number.

Document the LOCAL_PEEREID socket option in unix(4).

Based on contribution by Arne H. Juul, minor modifications by myself.

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