如何使用fork（）来守护进程子进程独立的它的父？ [英] How to use fork() to daemonize a child process independant of it's parent?

问题描述

  

可能重复：结果
  <一href=\"http://stackoverflow.com/questions/285015/linux-$p$pvent-a-background-process-from-being-stopped-after-closing-ssh-client\">Linux: prevent从关闭SSH客户端

后被停止的后台进程

我有我（在Linux中通常SSH）在终端接入，并与之交互的C程序。我一直想在那里后，我关闭终端/注销，这个过程用它结束（程序基本要求的一些选项，然后处理其业务，无需进一步互动，所以我想拥有它，找到解决问题的办法继续即使我退出SSH运行）。

有在Linux的方式来避免这种情况，如屏幕，但我想用C做编程不依赖于安装的软件包，如筛查即使这意味着重新发明轮子。

到目前为止，我明白fork（）的是，以守护进程的过程标准琐碎的方式，所以任何人都可以帮助我完成code，使上述过程发生？

在父：

 的main（）
{//做互动的东西信号（SIGCHLD，SIG_IGN）; //停止父等待子进程结束如果（叉（））
 出口（0）;
//现在的程序继续在子进程
 

我现在可以注销其SSH关闭原壳......而孩子继续工作！的

在小孩：

  //与数据处理/不管程序是否​​继续（无输入/输出端所需）
出口（0）;
 

解决方案

从父分离过程

对孩子过程使用setsid（），将在新的会话中运行该程序

  SID = setsid（）;
 

一起来看看在<一个例子href=\"http://www.itp.uzh.ch/~dpotter/howto/daemonize\">http://www.itp.uzh.ch/~dpotter/howto/daemonize

---

为了保持一个程序即使在终端关闭运行

SIGHUP时发送到其控制终端闭合的过程的信号。

尝试使用忽略它。

 信号（SIGHUP，SIG_IGN）;
 

Possible Duplicate:
Linux: Prevent a background process from being stopped after closing SSH client

I have a C program which I access and interact with over terminal (usually from SSH on a linux box). I have been trying to find the solution to the problem where after I close the terminal/logout, the process ends with it (the program basically asks for some options then goes about its business with no further interaction required so I would like to have it continue to run even after I logout of SSH).

There are ways in linux to avoid this such as 'screen', but I want to do it programatically with C without relying on installed packages such as screen- even if this means reinventing the wheel.

So far I understand fork() to be the standard trivial way to daemonize a process, so could anyone help me to finish the code that allows the above described process to happen?

Within parent:

 main()
{

//Do interactive stuff

signal(SIGCHLD, SIG_IGN); //stops the parent waiting for the child process to end

if(fork())
 exit(0);
// and now the program continues in the child process

I can now logout of SSH which closes the original shell...and the child continues its work!

Within child:

//Continue with processing data/whatever the program does (no input/output to terminal required)
exit(0);

解决方案

to detach the process from the parent:

use setsid() on the children process, it will run the program in new session

 sid = setsid();

take a look at the example on http://www.itp.uzh.ch/~dpotter/howto/daemonize

---

To Keep a program running even when the terminal is closed:

SIGHUP is a signal sent to a process when its controlling terminal is closed.

try to ignore it using

signal (SIGHUP, SIG_IGN);

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