Page 19 - DCAP103_Principle of operating system

Principles of Operating Systems

Notes
A timer can be set to interrupt the computer after a specified period. The
period may be fixed or variable.

1.5.4 Types of System Call

System calls can be roughly grouped into five major categories:
1. Process Control
• end, abort

• load, execute
• create process, terminate process
• get process attributes, set process attributes

• wait for time
• wait event, signal event
• allocate and free memory

2. File Management
• create file, delete file

• open, close
• read, write, reposition
• get file attributes, set file attributes

3. Device Management
• request device, release device

• read, write, reposition
• get device attributes, set device attributes
• logically attach or detach devices

4. Information Maintenance
• get time or date, set time or date
• get system data, set system data

• get process, file, or device attributes
• set process, file, or device attributes
5. Communication

• create, delete communication connection
• send, receive messages

• transfer status information
• attach or detach remote devices

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