Programming

I need to process a file in real time as it is being FTPed from a remote server. In my test environment, I wrote a process that would:

1) Open the file - fopen(filename, "r")
2) Go to the offset where I left off on the previous itteration (fseek)
3) Read 2K blocks and append each block to a second file till there isn't 2K of data to read (fread)
4) Close the file, sleep(3) and repeat.

In my development environment, this works like a charm. But when I move my process over to the production environment, I get ETXTBSY (Text file busy) on the fopen.

Anyone have any suggestions on what could be causing the difference?

According to the open manpage, ETXTBSY error would occur if you tried to open in write mode a file that is currently being executed.
In your case, just make sure that you are trying to open the right file. Put in some debug print statements or use a debugger to check the values of the variables before they are used. Make sure that filename contains the file being ftpd and not some other values.