HP TACL User Manual

Using INV and OUTV
Initiating and Communicating With Processes
107365 Tandem Computers Incorporated 5–17
Use the macro in Figure 5-7, fupin, to communicate with FUP using OUTV and a
static INV.
Figure 5-7. Communicating With FUP Using INV and OUTV
?SECTION fupin MACRO
#FRAME
PUSH in_variable == Create an IN variable
PUSH out_variable == Create an OUT variable
== Place a FUP command into the IN variable
#SET in_variable INFO STEIN.BOOK
FUP /INV in_variable, OUTV out_variable/
#OUTPUTV out_variable == Display FUP output
#UNFRAME
You can start a process in the background and send it commands from your terminal.
The following steps illustrate an interactive session with FUP:
1. Define the variables:
9> #PUSH input_queue output_queue prompt_string
termination_results
2. Start a FUP process that runs concurrently with the TACL process:
10> FUP /INV input_queue DYNAMIC PROMPT prompt_string,
OUTV output_queue, NOWAIT, STATUS termination_results/
3. Use #WAIT to make sure the previous operation has finished:
11> SINK [#WAIT prompt_string]
4. Clear the prompt variable:
12> #SET prompt_string
5. You can then send commands to FUP:
13> #APPEND input_queue purge X!
14> SINK [#WAIT prompt_string]
15> #SET prompt_string
16> #APPEND input_queue files
17> SINK [#WAIT prompt_string]
18> #SET prompt_string
6. Finally, terminate the FUP process and delete associated variables:
19> #APPEND input_queue exit
20> #POP input_queue output_queue prompt_string &
termination_results
When used for productive work, include error checking for the #WAIT operations.

HP TACL Specifications

General

Name	HP TACL
Purpose	Task automation, system management, and application control
Category	Software
Platform	HP NonStop
Type	Scripting language
Developer	Hewlett-Packard

Summary

Section 1 An Overview of TACL

Running the Examples in This Manual

Instructions for executing manual examples, including setting required variables.

About This Manual

Section 2 Developing TACL Programs

Processing Character Data

Covers tasks like constructing text strings, analyzing output, and manipulating characters.

Debugging TACL Programs

Introduces the TACL debugger for step-by-step execution and variable examination.

Section 3 Developing TACL Routines

Processing Arguments

Details how routines handle arguments using #ARGUMENT, including options and alternatives.

Writing an Exception Handler

Explains handling events like BREAK keys or TACL errors using exception handlers.

4 Accessing Files

#REQUESTER Operation

Describes the #REQUESTER function for opening files and initiating I/O operations.

Requesting Waited Reads

Explains opening files for waited read operations using #REQUESTER.

5 Initiating and Communicating With Processes

Initiating a Process: RUN and #NEWPROCESS

Covers starting processes using RUN and #NEWPROCESS, including startup options.

Using the INLINE Facility

Using INV and OUTV

Using $RECEIVE

Using #SERVER

6 Running TACL as a Server

Running a TACL Process as a Server

Explains making a TACL process a server by establishing its IN file as $RECEIVE.

Running TACL Code as a Server

Details providing TACL code for a TACL-server process using #INPUTV and #REPLYV.

Using TACL as a Pathway Server

Describes creating a Pathway environment with TCP and TACL servers to process requests.

7 Using Programmatic Interfaces

Overview of SPI and EMS

Using SPI

Using EMS

8 Example of a System Management Program

Monitoring System Operation