Dag-Erling Smørgrav a2fe44e8cf New file descriptor allocation code, derived from similar code introduced
in OpenBSD by Niels Provos.  The patch introduces a bitmap of allocated
file descriptors which is used to locate available descriptors when a new
one is needed.  It also moves the task of growing the file descriptor table
out of fdalloc(), reducing complexity in both fdalloc() and do_dup().

Debts of gratitude are owed to tjr@ (who provided the original patch on
which this work is based), grog@ (for the gdb(4) man page) and rwatson@
(for assistance with pxeboot(8)).
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