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/freebsd-10.1-release/usr.sbin/ppp/
H A Dmain.cdiff 79173 Wed Jul 04 01:34:20 MDT 2001 brian Handle any of descriptors 0, 1 or 2 being closed when we're
envoked -- don't use them (as return values from open()), then
(say) close(STDIN_FILENO) when daemonising.

This is done by grabbing 3 descriptors to /dev/null at startup and
releasing them after we've daemonised.

MFC after: 1 week

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