I am sending files using the Curl (7.21.6) multi interface via SFTP.

I want to make sure that I perform some logic exactly once IFF the files
were transferred successfully.

So where should I place this logic?

I could place this logic in the progress_callback function. It would execute
in the case that ultotal == ulnow. Then it would set a flag so it doesn't
repeat..
Or I could place it in the read_callback function. It would execute just
before call back returned zero.

But both approaches have drawbacks:

   - I'm concerned that a timing issue may cause the transfer to complete
   before a progress callback happens. So it might never be called in the case
   ultotal == ulnow.
   - Doing the logic in the read callback isn't really a guarantee that the
   file has transferred fully. The connection might break after the
   read_callback returns 0 but before the last chunk of data is actually sent.

So when/where do others place this type of logic?

- Saqib

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Received on 2011-06-03