A call to the Get Device/Volume Information ($GETDVI)
system service returns the following information for any device serviced
by the generic SCSI class driver. (See the description of the $GETDVI
system service in the HP OpenVMS System Services
Reference Manual.)
$GETDVI returns the following device characteristics
when you specify the item code DVI$_DEVCHAR:
DEV$M_AVL | Available device |
DEV$M_IDV | Input device |
DEV$M_ODV | Output device |
DEV$M_SHR | Shareable device |
DEV$M_RND | Random-access device |
DVI$DEVCLASS returns the device class, which is
DC$_MISC; DVI$DEVTYPE returns the device type, which is DT$_GENERIC_SCSI.
