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Argument

 

logical-unit-number

   OpenVMS usage:longword_signed
   type:         longword integer (signed)
   access:       write only
   mechanism:    by reference

   Allocated logical unit number or -1 if none was available. The
   logical-unit-number argument is the address of a longword into
   which LIB$GET_LUN returns the value of the allocated logical
   unit. LIB$GET_LUN can allocate logical unit numbers 100 through
   119 on VAX, and 100 through 299 on Alpha and I64.