Returns information about an I/O device; this information
    consists of primary and secondary device characteristics.

    The $GETDVIW service completes synchronously; that is, it returns
    to the caller with the requested information. VSI recommends that
    you use an IOSB with this service. An IOSB prevents the service
    from completing prematurely. In addition, the IOSB contains
    additional status information.

    For asynchronous completion, use the Get Device/Volume
    Information ($GETDVI) service; $GETDVI returns to the caller
    after queuing the information request, without waiting for the
    information to be returned. In all other respects, $GETDVIW
    is identical to $GETDVI. For all other information about the
    $GETDVIW service, see the description of $GETDVI.

                                   NOTE

       All pathname-related information pertains only to Alpha and
       Integrity server systems.

    Format

      SYS$GETDVIW  [efn] ,[chan] ,[devnam] ,itmlst [,iosb] [,astadr]

                   [,astprm] [,nullarg,][pathname]

    C Prototype

      int sys$getdviw  (unsigned int efn, unsigned short int chan,

                       void *devnam, void *itmlst, struct _iosb

                       *iosb, void (*astadr)(__unknown_params), int

                       astprm, unsigned __int64 *nullarg,...);