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15841f187d
This fixes a problem introduced in 8a5fe8ce6b
On BSD, fdescfs is normally mounted at /dev/fd. However
if it is NOT mounted, devfs creates a directory at /dev/fd
which contains (only) the file descriptors 0,1 and 2.
Under these conditions, opendir() will succeed, and
if we proceed we will fail to close extant
file descriptors which should be closed.
Check that there is a filesystem mounted at /dev/fd
by checking that the device changes between /dev/fd
and /dev. If if doesn't, fall back to the dumb path.
Thanks to Roman Bogorodskiy for spotting the problem
and helping with diagnosis.