> try 'ratrace -c auth/none cmd ...' while not being none
> and ignore everything preceding Exec "cmd".

nice trick.

> 
> > as i understand it, your claim is that mv works as none but ape/rename
> > does not and this is because ape/rename uses wstat.
> 
> both use wstat or copying; what's different is how they choose what to use.
> mv falls back to copying if wstat fails; ape/rename does not.

oh, i thought you were comparing system/library calls, not library function
vs program.  i don't understand that comparison.

- erik

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