您可能希望标准的Unix守护技术，涉及双叉：

You probably want the standard Unix daemon technique, involving a double fork:

void daemonize(void)
{
  if (fork()) exit(0); // fork.  parent exits.
  setsid(); // become process group leader
  if (fork()) _exit(0); // second parent exits.
  chdir("/"); // just so we don't mysteriously prevent fs unmounts later
  close(0); // close stdin, stdout, stderr.
  close(1);
  close(2);
}

看起来像现代的Linux机器有守护进程（）库函数presumably做同样的事情。

Looks like modern Linux machines have a daemon() library function that presumably does the same thing.

这有可能是第一个退出应 _exit ，但这code一直为我工作

It's possible that the first exit should be _exit, but this code has always worked for me.