my_done()

a routine called when the program is about to terminate

Synopsis:

int my_done( struct _doc_ctrl *c );

This function is called when the program is about to terminate. It should:

Free any system resources.
Return the port (/dev/par) to its original state. For example:
```
reset_device( fileno( prn_fd ));
    
```

The default version of this function does nothing.

This function is called when the print filter terminates normally or abnormally.

An exit code (usually EOK) to be returned to the shell. For other possible values, see errno in the C Library Reference.

Photon