NAME
   TD_EJECT -- eject the disk in the drive, if possible.

FUNCTION
    This command causes the drive to attempt to eject the disk in
    it, if any.  Note that the current trackdisk.device does not
    implement this command, but it might in the future, and other
    trackdisk-compatible drivers may implement this command.

IO REQUEST INPUT
    io_Device       preset by the call to opendevice()
    io_Unit         preset by the call to opendevice()
    io_Command      TD_EJECT
    io_Flags        0 or IOF_QUICK

IO REQUEST RESULT
    io_Error - 0 for success, or an error code as defined in
               <devices/trackdisk.h>