Explore the detailed explanation of the file where the Linux kernel source code is located
Linux is an open source operating system, and its kernel source code is a core part of its design and functionality and has been widely studied. and use. The Linux kernel source code contains many files, each file is responsible for different functional modules. In this article, we will delve into the role of several key files and specific code examples in the Linux kernel source code to help readers better understand the design and operation of the Linux kernel.
#include <linux/sched.h> #include <linux/sched/signal.h> void schedule(void) { struct task_struct *prev, *next; prev = current; next = pick_next_task(); // 选择下一个要运行的进程 switch_to(next); // 切换到下一个进程执行 }
#include <linux/slab.h> void *kmalloc(size_t size, gfp_t flags) { struct kmem_cache *cache; void *ptr; cache = get_cache_for_size(size); // 根据分配大小获取合适的缓存 ptr = alloc_slab(cache); // 从缓存中分配内存 return ptr; }
#include <linux/fs.h> #include <linux/path.h> int vfs_open(const char *pathname, int flags, int mode) { struct path path; struct file *file; int err = kern_path(pathname, LOOKUP_FOLLOW, &path); if (!err) { file = filp_open(&path, flags, mode); if (IS_ERR(file)) { err = PTR_ERR(file); } } return err; }
By analyzing the code examples of the above key files, readers can have a deeper understanding of the structure and function of the Linux kernel source code. In addition to these files, the Linux kernel also contains many other important files, covering the implementation of process management, memory management, file systems, etc. Further research and exploration of the Linux kernel source code will help understand the design principles and internal working mechanisms of the operating system, and improve the ability and level of system programming.
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