Linux服务器进程一般都是守护进程，在创建时父进程要和子进程脱离，将子进程的父进程设置为id为1的进程。随后父进程退出，子进程作为守护进程运行，处理客户端来的业务。-Linux server process is generally a guardian of the process, in the creation of the parent process and child process to be separated, the child process of the parent