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EN_Linux_Kernel
The core of the operating system: The kernel is the core part of all operating systems. It is a layer that communicates directly with the hardware and provides essential services to applications and system processes.
Linux Kernel as a Monolithic Kernel:
Linux is specifically a "Monolithic" kernel. This means that most of the core system functions (e.g., file system management, device drivers, memory management, etc.) are contained within a single large binary. This keeps these components in separate processes for modularity and security, but also for efficiency. This is different from the microkernel design, which can be dropped.
The kernel is responsible for managing hardware resources, ensuring efficient operation of processes, and providing essential services on which applications depend. Let's break down these responsibilities:
- Process management
- Memory management
- Device management
- File system management
- Network stack
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System call interface:
This is the gateway between user space applications and the kernel. Through system calls, an application can request specific services from the kernel, such as file operations, process control, and network communication. -
Kernel module:
A part of the kernel that can be loaded dynamically. This includes device drivers, file system drivers, and network protocol handlers. Modules provide flexibility because they can be loaded and unloaded without rebooting the system. -
Interprocess communication (IPC):
The kernel provides mechanisms for processes to communicate with each other, such as pipes, message queues, and shared memory. IPC is essential for complex applications where multiple processes work together. -
Security and access control:
The Linux kernel includes powerful security mechanisms such as Security-Enhanced Linux (SELinux) and AppArmor. These frameworks enforce strict access control policies, allowing granular security settings at the process and file level.