request_id

    OpenVMS usage:address
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Request identifier value supplied by the symbiont when it calls
    your input routine. The request_id argument is the address of a
    longword containing this request identifier value.

    If your input routine initiates an asynchronous operation (for
    example, a call to the $QIO system service), your input routine
    must copy the request identifier value specified by request_
    id because this value must later be passed to the PSM$REPORT
    routine. See the description of the PSM$REPORT routine for more
    information.

 work_area

    OpenVMS usage:address
    type:         longword (unsigned)
    access:       write only
    mechanism:    by reference
    Work area supplied by the symbiont for the use of your input
    routine. The symbiont supplies the address of this area when it
    calls your routine. The work_area argument is a longword into
    which the symbiont writes the address of the work area. The work
    area is a section of memory that your input routine can use for
    buffering and for other internal operations.

    The size of the work area allocated is specified by the work_size
    argument in the PSM$PRINT routine. If you do not specify work_
    size in the call to PSM$PRINT, no work area is allocated.

    In a multithreaded symbiont, a separate work area is allocated
    for each thread. This work area is shared by all user routines.
    The work area is initialized to zero when the symbiont is first
    started.

 func

    OpenVMS usage:function_code
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Function code supplied by the symbiont when it calls your
    input routine. The func argument is the address of a longword
    containing this code.

    The function code specifies the reason the symbiont is calling
    your input routine or, in other words, the function that the
    symbiont expects your routine to perform at this time.

    Most function codes require or allow additional information
    to be passed in the call by means of the funcdesc and funcarg
    arguments. The description of each input function code,
    therefore, includes a description of how these two arguments
    are used with that function code.

    Following is a list of all the function codes that the symbiont
    can specify when it calls your input routine (function codes
    applicable only to format and output routines are explained in
    the descriptions of the USER-FORMAT-ROUTINE and USER-OUTPUT-
    ROUTINE, respectively); all function codes are defined by the
    $PSMDEF macro.