Arguments

 

inadr

   OpenVMS usage:address_range
   type:         longword (unsigned)
   access:       read only
   mechanism:    by reference
   Starting and ending virtual addresses of the range of pages whose
   fault characteristic is to be changed. The inadr argument is the
   address of a 2-longword array containing, in order, the starting
   and ending process virtual addresses.

   Addresses are adjusted up or down to fall on CPU-specific page
   boundaries. Only the virtual page number portion of each virtual
   address is used; the low-order byte-within-page bits are ignored.

   If the starting and ending virtual addresses are the same, the
   fault characteristic is changed for a single page.
 

retadr

   OpenVMS usage:address_range
   type:         longword (unsigned)
   access:       write only
   mechanism:    by reference-array reference or descriptor
   Starting and ending virtual addresses of the range of pages whose
   fault characteristic was actually changed by $SETFLT. The retadr
   argument is the address of a 2-longword array containing, in
   order, the starting and ending process virtual addresses.

   If an error occurs while the fault characteristic is being
   changed, $SETFLT writes into retadr the range of pages that were
   successfully changed before the error occurred. If no pages were
   affected before the error occurred, $SETFLT writes the value -1
   into each longword of the 2-longword array.
 

acmode

   OpenVMS usage:access_mode
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Access mode associated with the call to $SETFLT. The acmode
   argument is a longword containing the access mode. The $PSLDEF
   macro defines symbols for the access modes.

   The $SETFLT service uses whichever of the following two access
   modes is less privileged: (1)  the access mode specified by
   acmode or (2)  the access mode of the caller. To change the fault
   characteristic of any page in the specified range, the resultant
   access mode must be equal to or more privileged than the access
   mode of the owner of that page.
 

fault_flag

   OpenVMS usage:mask_longword
   type:         longword (unsigned)
   access:       read only
   mechanism:    by value
   Flag mask specifying the request options. The fault_flag argument
   is a longword bit vector in which each bit corresponds to a flag.
   The $FLTDEF macro and the FLTDEF.H file define a symbolic name
   for each flag.

   The $FLTDEF macro defines the following symbolic names for the
   fault characteristic codes:

   Symbol             Description

   FLT$M_NO_EXECUTE   Fault on execute access attempt
   FLT$M_EXECUTABLE   Allow execute access

   If you specify the fault characteristic as the value 0, the
   characteristic defaults to no execute access.