FORTRAN Reference Manual

Utility Routines

FORTRAN Reference Manual—528615-001

15-23

Using SMU Routines

To reference an SMU routine in a program unit, you must declare it in a GUARDIAN

directive. (The GUARDIAN directive is described in Section 10, Compiler Directives

The following example shows how to declare the SMU routine GETPARAMTEXT as a

Guardian procedure:

?GUARDIAN GETPARAMTEXT

You must declare the routine before the first FORTRAN statement that calls that

procedure.

SMU routines operate on copies of the process creation messages that establish the

execution environment for a program. Copies of these messages are not saved

automatically; you must request them using the SAVE compiler directive. During

process creation the messages selected by a SAVE directive are saved in an area

inaccessible to the FORTRAN program.

Figure 15-1. Process Messages Manipulated by the SMU

Saved

Messages

"Parent"

FORTRAN

Process

Names and associated values from PARAM commands

Logical file names and associated actual file names from ASSIGN commands

STARTUP message with the names of the IN file and the OUT file,

the default volume and subvolume, and the text string that follows

the closing "/" of the RUN command parameter list.

Descendant

Process

The parent process:

! Saves the messages

! Modifies the messages

! Calls CREATEPROCESS to launch

a new process, passing to it the

modified ASSIGN, PARAM, and

STARTUP messages

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