An in-depth exploration of the Linux kernel source code distribution

This is a 1,500-word article that deeply explores the Linux kernel source code distribution. Due to limited space, we will focus on the organizational structure of the Linux kernel source code and provide some specific code examples to help readers better understand.

The Linux kernel is an open source operating system kernel whose source code is hosted on GitHub. The entire Linux kernel source code distribution is very large, containing hundreds of thousands of lines of code, involving multiple different subsystems and modules. To have a deep understanding of the Linux kernel source code distribution, you first need to be familiar with its overall organizational structure.

In the root directory of the Linux kernel source code, you can see a series of subdirectories and files. Some of the main subdirectories include:

• arch: contains files for different Architecture-specific code, such as x86, ARM, etc.
• block: Contains code related to block devices.
• drivers: Contains the code for various device drivers.
• fs: Contains file system-related code.
• include: Contains various header files.
• kernel: Contains code related to the kernel itself, such as scheduling, memory management, etc.
• net: Contains the code of the network subsystem.

In addition to these main subdirectories, there are many other subdirectories and files, each with its own specific function and role. Below we use a specific example to introduce the distribution of Linux kernel source code.

Take the USB device driver as an example, it is usually located in the drivers/usb directory. In this directory, we can find some files related to USB device drivers, such as usb.c, usb.h, etc. These files contain the specific implementation of the USB device driver, such as device initialization, data transmission, etc.

Next, let’s look at a simple USB device driver code example:

#include <linux/module.h>
#include <linux/usb.h>

static struct usb_device_id my_usb_device_id_table[] = {
    { USB_DEVICE(0x1234, 0x5678) },
    {}
};

MODULE_DEVICE_TABLE(usb, my_usb_device_id_table);

static int my_usb_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
    //Write device initialization code here
    return 0;
}

static void my_usb_disconnect(struct usb_interface *interface)
{
    //Write the device disconnection processing code here
}

static struct usb_driver my_usb_driver = {
    .name = "my_usb_driver",
    .id_table = my_usb_device_id_table,
    .probe = my_usb_probe,
    .disconnect = my_usb_disconnect,
};

module_usb_driver(my_usb_driver);

MODULE_LICENSE("GPL");

In this code, we define a simple USB device driver. Among them, my_usb_device_id_table is used to specify the Vendor ID and Product ID of the supported USB device, the my_usb_probe function is used for device initialization, and the my_usb_disconnect function is used to handle device disconnection. time operation. Finally, the driver is registered through the module_usb_driver macro.

Through this example, we can see the distribution structure of the Linux kernel source code and the implementation of a simple device driver. In-depth exploration of the Linux kernel source code distribution will help us better understand the implementation principles of the operating system kernel and improve our programming capabilities and system debugging skills.

The above is the detailed content of An in-depth exploration of the Linux kernel source code distribution. For more information, please follow other related articles on the PHP Chinese website!