03-02-2010
First, you need to define exactly what you mean by "finished copying", and you need to define it precisely.
And remember you're going to have to handle error conditions, too, such as when someone is copying a file remotely and the connection drops before the copy is done.
FWIW, the only person who can tell definitively that any copy is complete is the person sending the file, because the receiver can't know what's being sent as the receiver doesn't have the original. That means if you value reliability and guaranteed correctness, you MUST have the sender somehow flag that the copy is complete. Probably the easiest way is with a rename of the file. Call it something like 'filename.part' while copying, then rename it to 'filename' once the copy is done.
No, you CAN'T reliably use something like lsof on a Linux box to check if any other process has the file open, because that ignores error conditions.
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