本文主要是介绍lab-1：Xv6 and Unix utilities，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
实验工具
- clone实验源码
git clone git://g.csail.mit.edu/xv6-labs-2023 - 进入目录
cd xv6-labs-2023 - 运行内核
make qemu - 打印数据
Ctrl-p - 退出
ctr+a+x
xv6中的system call
int fork() Create a process, return child’s PID.
int exit(int status) Terminate the current process; status reported to wait(). No return.
int wait(int *status) Wait for a child to exit; exit status in *status; returns child PID.
int kill(int pid) Terminate process PID. Returns 0, or -1 for error.
int getpid() Return the current process’s PID.
int sleep(int n) Pause for n clock ticks.
int exec(char *file, char *argv[]) Load a file and execute it with arguments; only returns if error. char *sbrk(int n) Grow process’s memory by n bytes. Returns start of new memory.
int open(char *file, int flags) Open a file; flags indicate read/write; returns an fd (file descriptor).
int write(int fd, char *buf, int n) Write n bytes from buf to file descriptor fd; returns n.
int read(int fd, char *buf, int n) Read n bytes into buf; returns number read; or 0 if end of file.
int close(int fd) Release open file fd.
int dup(int fd) Return a new file descriptor referring to the same file as fd.
int pipe(int p[]) Create a pipe, put read/write file descriptors in p[0] and p[1].
int chdir(char *dir) Change the current directory.
int mkdir(char *dir) Create a new directory.
int mknod(char *file, int, int) Create a device file.
int fstat(int fd, struct stat *st) Place info about an open file into *st.
int stat(char *file, struct stat *st) Place info about a named file into *st.
int link(char *file1, char *file2) Create another name (file2) for the file file1.
int unlink(char *file) Remove a file.
exit()
- 作用：系统调用，用于当前进程停止执行、释放资源。
- 返回值：0-成功，1-失败
- 具体作用：返回当前进程被的子进程（退出或杀死）的PID
复制子进程的退出状态到等待序列
用户级睡眠程序
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