Check whether a file is in use

[meereck]

Hello, a file is uploaded through a FTP server.
Is there anyway I can find out whether entire file has been uploaded?
For example, I can open that file for reading, if it returns error, it means the file upload hasnt been started yet.
However, if the upload has started, how can I find out that the file has been uploaded? For example, by checking whether any process uses that file?
There is no way I could know the filesize in advance.

I consider that once the upload starts, it will be successfully finished. The connection is reliable but slow.

I use C/C++.

cheers, meereck

[burschik]

Yes, that is possible. Look at the code of "fuser" or "lsof".