Lecture: Operating System Services

Introduction

• Overview of Operating System (OS) services.
• Importance of OS in managing computer resources and user interactions.

Key Functions of Operating Systems

1. Process Management

   • Creation and deletion of processes.
   • Suspension and resumption of processes.
   • Provides mechanisms for process synchronization and communication.

2. Memory Management

   • Keeps track of each byte in a computer's memory and allots memory to processes.
   • Handles memory allocation and deallocation.
   • Provides protection and management of memory.

3. File System Management

   • Organization, storage, retrieval, naming, sharing, and protection of files.
   • Provides a file directory structure.

4. Device Management

   • Manages device communication via drivers.
   • Handles device requests and status reports.

5. Security and Protection

   • Protects against unauthorized access to resources.
   • User authentication and data encryption.

6. Network Management

   • Facilitates networking operations and connectivity.
   • Manages network protocols.

User Interface Services

• Command Line Interface (CLI)

  • Text-based interface for command input.

• Graphical User Interface (GUI)

  • Visual interface for easier interaction.

System Calls

• Mechanism for user applications to interact with OS.
• Types of system calls include:
  • Process control calls.
  • File management calls.
  • Device management calls.
  • Information maintenance calls.
  • Communication calls.

Conclusion

• OS services are critical in ensuring smooth operation and management of computer systems.
• Continuous evolution to meet new computing demands.