Envoy Application Programming Manual
Table Of Contents
- What’s New in This Manual
- About This Manual
- 1 Application Programming With Envoy
- 7 ADM-2 Multipoint Supervisor Protocol
- 8 TINET Multipoint Supervisor Protocol
- 9 Burroughs Point-To-Point Protocol
- 10 Asynchronous Line Supervisor Protocol
- A ASCII Character Set
- B ASCII to EBCDIC Code Conversion
- C File-System Procedures
- D Statistics Messages
- E S-Series Changes to Envoy
- NonStop™ Himalaya S-Series Server Architecture
- G-Series Migration Considerations
- CBSENSEON and CFSENSEON Modifiers
- LEOTRESYN and NOLEOTRESYN Modifiers
- Treatment of Characters After the Termination Character
- Number of SYN Characters
- DTR Drop
- Reporting of Parity Error
- Half-Duplex Support for Asynchronous Lines
- Controller Replacement
- SYSGEN and COUP
- Unit Numbers
- FDX Line Changes
- No Support for Auto-Call Unit
- Glossary
- Index
Software Concepts
Envoy Application Programming Manual—427159-001
2-4
File-System Procedures
An application process functionally interacts with Envoy by way of:
•
Guardian 90 file-system procedures
•
Guardian 90 file-system error codes
•
Format of the message being transferred
The interrupt handler receives line interrupts from all configured asynchronous and byte-
synchronous communication lines and routes them to the proper I/O process.
File-System Procedures
The Guardian 90 file-system procedures that you can call to perform Envoy data
communications tasks are:
AWAITIO[X]
CANCEL
CANCELREQ
CHANGELIST
CLOSE
Figure 2-1. Application-Guardian 90-Envoy Relationship
007CDT .CDD
Application
Process
Guardian 90
User
Envoy
Envoy I/O
Process
Protocol
Procedure
Driver
Procedure
File-System
Procedures (OPEN,
CLOSE, READ,
WRITE, CONTROL,
and so forth)