Chapter 6 File System

Table of Contents

Records and Files in the File System

Device Files
Disc Files

Disc File Storage

File Directory Structure

Domains
File Specifications
File Designators
User-defined Files
System Files
Input/Output Sets
Passed Files
Searching File Directories
Finding Files
Types of Operations Allowed on Files

Using Files at Run Time

Hierarchy of File Overrides

Record Structure

Storage Format
Record Types
Specifying a Record Size

File Structure

File Types
File Codes
Creating a File
Deleting Files
Renaming Files
Saving Temporary Files
Listing File Characteristics
The :FILE Command

Record Selection and Data Transfer

Record Pointers
Pointer Initialization
Record Selection
Mapped Access to Disc Files
Multiple Record Transfers
Data Transfer Control Operations
Reading from a File
Writing to a File
Updating a File
Using Mapped Access to a File
Device File Buffers

Sharing a File

Maintaining File Security

Lockwords
MPE/iX File Access System
Access Control Definitions (ACDs)

The File System is the part of the MPE/iX operating system that manages data access on the 900 Series of the HP 3000 family of computers. The MPE/iX I/O System transfers data between the File System and physical devices (for example, printers and tape drives). Figure 6-1 “File System Interface” shows the relationships of a program, the MPE/iX File System, the MPE/iX I/O System and the system hardware. The File System is the interface between a program and the rest of the system.

Figure 6-1 File System Interface

Chapter 6 File System

Technical documentation

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