sh/expect/sudo/screen 所有需要在一个命令中一起完成
我需要发生什么：PHP 需要启动一个在后台运行的具有 root 权限的服务器应用程序。这一切都应该保持沉默。
-需要sudo来允许php执行需要root权限的操作。
- 需要屏幕才能允许应用程序在启动该进程的网页范围之外运行。
需要 -Expect 以便屏幕有一个运行点
-Sh 是需要的，因为无论开始运行什么都需要后台运行，大概是使用 &操作员。它还需要将任何输出通过管道传输到 /dev/null/ 因为我不希望我的 PHP 页面返回任何内容。如果有人能想出更好的方法在 PHP 中进行调用（fork...？），这可能是可以协商的
作为一个例子，我尝试使用的脚本是：
#!/usr/bin/expect -f
spawn sh ( screen -t srcds /usr/local/srcds_l/startserv )& > /dev/null
exit 0
作为参考，我正在尝试启动一个 Counter-Strike 源server，startserv 是处理启动服务器并收集其输出的 C 代码的名称。任何人都可以纠正我该片段的语法，或者告诉我为什么这样做是错误的吗？
What I need to have happen: PHP needs to launch an server app which has root permissions running in the background. All of this should be silent.
-Sudo is needed to allow php to perform an op that requires root permissions.
-Screen is required to allow the app to run outside the scope of the webpage which started the process.
-Expect is needed so that screen has a pts in which to run
-Sh is needed because whatever starts running needs to be backgrounded, presumably with the & operator. It would also need to pipe any output to /dev/null/since I don't want my PHP page returning anything. This is probably negotiable somehow if somebody can think of a better way to do the call in PHP (fork...?)
As an example, the script I tried to use was:
#!/usr/bin/expect -f
spawn sh ( screen -t srcds /usr/local/srcds_l/startserv )& > /dev/null
exit 0
For reference I am trying to start a Counter-Strike Source server, and startserv is the name of the C code which handles launching the server and collecting its output. Can anybody correct my syntax for that snippet, or tell me why its the wrong thing to do?
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这种情况最终通过简单地使用 fork 和进程组控制使进程自行守护，然后让 PHP 执行带有 sudo 的系统调用来解决。
我有另一个类似的情况，最终发现
它在内部使用 screen，并完成我最初考虑让 screen Expect 和 sh 做的工作。
This situation was eventually solved by simply making the process daemonize itself using a fork and process group control and then just having PHP do a system call with a sudo in it.
I had another similar situation to eventually found
which uses screen internally, and does the kind of work that I was initially thinking of having screen expect and sh do.
我没有为您提供完整的解决方案，但您可能想查看 nohup 而不是 screen。这也消除了 Expect 的需要。
I don't have a complete solution for you, but you might want to look at nohup instead of screen. That eliminates the Expect need as well.
传达 1 位信息（“现在就开始”）是巨大的开销。如果您忘记了 PHP，那么所有其他从属要求都会消失。
如果我尝试这样做，我可能会编写一个 perl 脚本来侦听 TCP 端口上的“启动”命令，然后分叉进程本身。这样就不再需要 sh、expect、screen 和 sudo。
That's a huge amount of overhead to communicate 1 bit of information ("start yourself now"). If you forget PHP then all the other subordinate requirements fall away.
If I was trying to do this, I'd probably write a perl script to listen on a TCP port for a "start" command and just fork off the process itself. This gets rid need for sh, expect, screen, and sudo.