The best way to find Linux kernel source code

Title: The best way to find Linux kernel source code, specific code examples are needed

When learning Linux kernel development or system tuning When searching for Linux kernel source code, it is a very important task. Understanding the Linux kernel source code structure, function definitions and implementation details can help developers gain a deeper understanding of the working principles of the operating system, thereby improving development efficiency and problem-solving abilities.

So, what are the best ways to find the Linux kernel source code? Some methods will be introduced below with specific code examples.

1. Browse the Linux kernel source code online

The easiest way is to view the Linux kernel source code through an online browser, so that you can quickly find what you need code. You can use websites such as [lxr.linux.no](http://lxr.linux.no/) and other online readers to browse the Linux kernel source code.

For example, assuming we want to find the implementation code of the sys_exit function, we can search for the keyword of the function in the online browser and find the corresponding code file. Specific code examples are as follows:

/*
 * Free all assets associated with a process,
 * and notify "group_stop" of its death.
 */
void do_exit(long code)
{
    struct task_struct *tsk = current;
    struct mm_struct *mm = tsk->mm;
    struct exit_call_struct *p;

    WARN_ON(atomic_read(&tsk->fs_excl));
    tracehook_finish_exit(tsk);

    if (vtime_accounting_enabled() && !do_task_stat(tsk))
        vtime_exit(tsk);
    cgroup_exit(tsk);

    if (!tsk->io_context)
        tsk->io_context = &noop_ioc;

    /* sync mm's RSS info back to its owner when required */
    if (mm)
        sync_mm_rss(mm);
    /*
     * Make sure we are holding no locks:
     */
    DEBUG_LOCKS_WARN_ON(!rwsem_is_locked(&current->mm->mmap_sem) &&
                        !rwsem_is_locked(&current->mm->page_table_lock));

    BUG_ON(tsk->journal_info != NULL);
    do_memory_accounting(tsk);
    security_ops->task_free(tsk);

    thread_group_exit(code);
}

For beginners or developers who only check a small amount of code, using an online browser can quickly and easily obtain the required kernel source code information.

2. Use the git tool to view the Linux kernel source code

Another method is to directly clone the Linux kernel source code repository through the git tool, so that you can view and view it locally Revise. First, you need to install the git tool, and then use the following command to clone the Linux repository:

git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

After the cloning is completed, all Linux kernel source codes will be found in the local file system. You can then use a text editor or code reading tool to view and modify the code. Specific code examples are as follows:

/*
 * Main exit path for a task. Do some of the accounting and invoke
 * the relevant process signal handler.
 */
void do_exit(long code)
{
    struct task_struct *tsk = current;
    
    /* Free all assets associated with the process */
    exit_task_struct(tsk);
    
    /* Notify group_stop of the process's death */
    exit_notify(code);
    
    /* Call the scheduler to switch to a new process */
    schedule();
}

The way to view the Linux kernel source code through the git tool is more suitable for developers who have needs for kernel development. The code can be viewed, debugged and modified locally.

Conclusion

Viewing the Linux kernel source code through an online browser and git tool is one of the important ways to learn kernel development and system tuning. When searching for kernel source code, you can choose the appropriate method according to specific needs and use specific code examples to better understand and use the kernel source code. I hope this article will be helpful to everyone when searching for the Linux kernel source code.

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