RFC 11 - Implementation of the Host - Host Software Procedures in GORDO

• Status: Unknown
• Published: August 1969
• Stream: Legacy
• Errata: No Errata

---

Document Information

• RFC Number: 11
• Title: Implementation of the Host - Host Software Procedures in GORDO
• Authors: G. Deloche
• Date: August 1969
• Category: Unknown

Abstract

RFC 11 is a working paper by G. Deloche of UCLA, dated August 1969, on the implementation of the HOST-HOST software procedures in GORDO, the time-sharing system of the UCLA Sigma 7 HOST. Its first part specifies the HOST functions for exchanging messages: links and connections, the control, primary and auxiliary connection types, the structure of a message (leader, marking, text, checksum and padding) with the checksum computation, the user transactions OPENPRIM, OPENAUX, TRANSM and CLOSE, and the HOST-HOST protocol of control messages (ENQ, ACK, NAK, EOT) exchanged over the control link. Its second part describes the implementation in GORDO: the GORDO file system and processes, the software organization built around the Network and Handler programs, the HOST, CONNECT and INPUT LINK allocation tables, the buffer pages (I/O communication page, connection shared pages and working page), and the typical software sequences followed when a user opens a primary link or transmits a message. The flowcharts of Appendix A are available only in the PDF version of the document.

Table of Contents

• 1. Introduction
• 2. HOST-HOST Procedures
  • 2.1 Generalities
  • 2.2 Links and Connections (See figure 1)
    • 2.2.1 Definitions
      • (a) Logical connections
      • (b) Logical links
    • 2.2.2 Connection types
      • (a) Control connection
      • (b) Primary connection
      • (c) Auxiliary connection
  • 2.3 Message Structure
  • 2.4 User Transactions
    • 2.4.1 List of transactions
      • (a) Open primary connection:
      • (b) Open auxiliary connection
      • (c) Transmission over connection
      • (d) Close connection
    • 2.4.2 HOST-HOST protocol and control messages
      • (a) Open a primary connection: (OPENPRIM)
        • (i) HOST(x) sends the following control message:
        • (ii) HOST(y) acknowledges by sending back the following control message:
      • (b) Transmission over primary connection: (TRANSM)
      • (c) Open an auxiliary connection: (OPENAUXI)
      • (d) Transmission over auxiliary connection: (TRANSM)
      • (e) Close connections: (CLOSE)
• 3. Implementation in GORDO
  • 3.1 Introduction to GORDO
    • 3.1.1 GORDO file system
    • 3.1.2 GORDO process
  • 3.2 Software Organization Overview
  • 3.3 Software Description
    • 3.3.1 Data Structures
      • 3.3.1.1 Allocation tables: HOST, CONNECT, INPUT LINK
        • (a) HOST table (see figure 5)
        • (b) CONNECT table
        • (c) INPUT LINK table
      • 3.3.1.2 Buffer pages
        • (a) I/O communication page
        • (b) Connection shared pages (User-Network shared zone)
        • (c) Working page
    • 3.3.2 Programs
      • 3.3.2.1 Handler program
      • 3.3.2.2 Network program
  • 3.4 Software Procedures
    • 3.4.1 Description of some typical sequences
      • (a) Open a primary link (See also 2.4.2)
        • (i) What the user program does[1]:
        • (ii) What the Network program does:
      • (b) Transmit a message over primary link
        • (i) What the user program does[1].
        • (ii) What the Network program does:

[[RFC Editor Note: [s] represents subscript s]]

Appendices

• Appendix A: Flowcharts

---

Related Resources

• Official RFC: RFC 11
• DataTracker: RFC 11 Info
• Errata: RFC Editor Errata