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.