Arguments

 

devnam

   OpenVMS usage:device_name
   type:         character-coded text string
   access:       read only
   mechanism:    by descriptor-fixed-length string descriptor
   Device name of the device to be allocated. The devnam argument
   is the address of a character string descriptor pointing to the
   device name string.

   The string can be either a physical device name or a logical
   name. If it is a logical name, it must translate to a physical
   device name.
 

phylen

   OpenVMS usage:word_unsigned
   type:         word (unsigned)
   access:       write only
   mechanism:    by reference
   Word into which $ALLOC writes the length of the device name
   string for the device it has allocated. The phylen argument is
   the address of this word.
 

phybuf

   OpenVMS usage:device_name
   type:         character-coded text string
   access:       write only
   mechanism:    by descriptor-fixed-length string descriptor
   Buffer into which $ALLOC writes the device name string for the
   device it has allocated. The phybuf argument is the address of a
   character string descriptor pointing to this buffer.
 

acmode

   OpenVMS usage:access_mode
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Access mode to be associated with the allocated device. The
   acmode argument is a longword containing the access mode.

   The most privileged access mode used is the access mode of the
   caller. Only equal or more privileged access modes can deallocate
   the device.
 

flags

   OpenVMS usage:mask_longword
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Longword of status flags indicating whether to interpret the
   devnam argument as the type of device to be allocated. Only one
   flag exists, bit 0. When it is set, the $ALLOC service allocates
   the first available device that has the type specified in the
   devnam argument.

   This feature is available for the following mass storage devices:

   RA60    RA80    RA81    RC25
   RCF25   RK06    RK07    RL01
   RL02    RM03    RM05    RM80
   RP04    RP05    RP06    RP07
   RX01    RX02    TA78    TA81
   TS11    TU16    TU58    TU77
   TU78    TU80    TU81