K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2002-11-26T17:22:15.000000Z
K 7
svn:log
V 260
If the file descriptors passed into do_dup() are negative, return EBADF
instead of panicing.  Also, perform some of the simpler sanity checks on
the fds before acquiring the filedesc lock.

Approved by:	re
Reported by:	Dan Nelson <dan@emsphone.com> and others

END