先让父进程死亡，子进程的父进程会被操作系统管理
先使用gcc编译代码, 执行代码后用 ps -p <进程号> -f 查看进程

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>int main() {pid_t pid;// 创建子进程pid = fork();if (pid == -1) {// fork失败perror("fork failed");exit(EXIT_FAILURE);}if (pid > 0) {// 父进程代码printf("Parent process (PID: %d) is going to exit.\n", getpid());// 父进程退出，子进程成为孤儿进程sleep(15);exit(EXIT_SUCCESS);} else {// 子进程代码printf("Child process (PID: %d) will continue running.\n", getpid());// 子进程将执行一些任务，这里我们让它休眠一段时间sleep(30);// 子进程任务完成，退出printf("Child process (PID: %d) has finished its task and will exit.\n", getpid());exit(EXIT_SUCCESS);}return 0;
}