Process that locked file

Question

Im trying to identify the processes that have a text file locked.

Im looking to do this with Carbon or Cocoa please.

I am new to MacAPI, I come from WinAPI.

Thanks

edit: added corefoundation tag as i hear carbon is deprecated

Answer 1

You can check which process is using a file by running the command lsof e.g.

lsof | grep file.txt

From the manpage of lsof

The  mode character is followed by one of these lock characters, describing the type of lock applied to the
              file:

                   N for a Solaris NFS lock of unknown type;
                   r for read lock on part of the file;
                   R for a read lock on the entire file;
                   w for a write lock on part of the file;
                   W for a write lock on the entire file;
                   u for a read and write lock of any length;
                   U for a lock of unknown type;
                   x for an SCO OpenServer Xenix lock on part      of the file;
                   X for an SCO OpenServer Xenix lock on the      entire file;
                   space if there is no lock.

              See the LOCKS section for more information on the lock information character.