mtools: open flags

 
 3.5.4 Open Flags
 ----------------
 
 Moreover, the following flags are available:
 
 'sync'
      All i/o operations are done synchronously
 'nodelay'
      The device or file is opened with the O_NDELAY flag.  This is
      needed on some non-Linux architectures.
 'exclusive'
      The device or file is opened with the O_EXCL flag.  On Linux, this
      ensures exclusive access to the floppy drive.  On most other
      architectures, and for plain files it has no effect at all.