Arguments

 

chan

   OpenVMS usage:channel
   type:         word (unsigned)
   access:       read only
   mechanism:    by value
   Number of the I/O channel assigned to the device about which
   information is desired. The chan argument is a word containing
   this number.

   To identify a device to $DEVICE_PATH_SCAN, you can specify either
   the chan or devnam parameters, but you should not specify both.
   If you specify both arguments, the chan argument is used.

   If you specify neither chan nor devnam, $DEVICE_PATH_SCAN uses a
   default value of 0 for chan.
 

devnam

   OpenVMS usage:device_name
   type:         character-coded text string
   access:       read only
   mechanism:    by descriptor-fixed-length string descriptor
   The name of the device about which $DEVICE_PATH_SCAN is to
   return path information. The devnam argument is the address of
   a character string descriptor pointing to this name string.

   The device name string can be either a physical device name
   or a logical name. If the first character in the string is an
   underscore (_),  the string is considered a physical device name;
   otherwise, the string is considered a logical name and logical
   name translation is performed until either a physical device name
   is found or the system default number of translations has been
   performed.

   If the device name string contains a colon (:),  the colon and
   the characters that follow it are ignored.

   To identify a device to $DEVICE_PATH_SCAN, you can specify either
   the chan or devnam argument, but you should not specify both. If
   both arguments are specified, the chan argument is used.

   If you specify neither chan nor devnam, $DEVICE_PATH_SCAN uses a
   default value of 0 for chan.
 

itmlst

   OpenVMS usage:item_list_3
   type:         longword (unsigned)
   access:       read only
   mechanism:    by reference
   Item list specifying which information about the device is to be
   returned. The itmlst argument is the address of a list of item
   descriptors, each of which describes an item of information. The
   list of item descriptors is terminated by a longword of 0.

   Refer to the VSI OpenVMS System Services Reference Manual to view
   the item code diagram and descriptor fields table.
 

contxt

   OpenVMS usage:longword_unsigned
   type:         longword (unsigned)
   access:       modify
   mechanism:    by reference
   Value used to indicate the current position of a $DEVICE_PATH_
   SCAN search. The contxt argument is the address of the longword
   that receives this information. On the initial call, the longword
   should contain 0.
 

nullarg

   OpenVMS usage:null_arg
   type:         quadword (unsigned)
   access:       read only
   mechanism:    by reference
   Placeholding argument Reserved to VSI.