How does 'mv' rename directories?

[Conor P. Cahill]

In article <544 at isi.UUCP>, mike at isi.UUCP (Mike Maloney) writes:
> But on Microport, Xenix, and Sun Unix 4.0, /bin/mv is -rwxr-xr-x and is
> owned by 'bin'.   How is 'mv' able to rename directories on a properly 
> working system?

On system V 3.2 mv determines that a directory is to be moved and calls
the program /usr/lib/mv_dir which is setuid to root.


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