> Currently only implemented on Linux, though porting to BSDs should be
> straightforward.  The reason for the non-portability is that the
> current implementation uses sendmsg and recvmsg for passing file
> descriptors between processes.

BSD has had that since...4.3BSD, I think?  There is no nonportability
here unless they care about portability across the silent API change
(which is unlikely) or unless Linux does it gratuitously differently
(which is reasonably likely, actually).

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