ruby - 当调用者进程被杀死时，IO.popen 命令被杀死

Question

我有一个启动子进程的 Ruby 脚本。我希望他们在整个进程被杀死时被杀死。

IO.popen('testacular start unit.conf.js', 'w')

运行我的脚本:

user.name:/my/repo [git: my-branch] $ ruby my-script.rb

睾丸输出:

user.name:/my/repo [git: my-branch] $ info: Testacular server started at http://localhost:8000/
info (launcher): Starting browser PhantomJS
info (PhantomJS 1.7): Connected on socket id uVAO41Q2niyLA8AqbZ8w
PhantomJS 1.7: Executed 44 of 44 SUCCESS (0.213 secs / 0.115 secs)

按 Control-C 终止进程。检查正在运行的进程:

user.name:/my/repo [git: my-branch] $ ps
  PID TTY           TIME CMD
 # ...
39639 ttys019    0:01.28 node /usr/local/bin/testacular start unit.conf.js
39649 ttys019    0:00.09 node /usr/local/bin/phantomjs /var/folders/2p/dklw3xys2n3f4hqmx73zvz6w0000gp/T/testacular-61981618/capture.js
39650 ttys019    0:00.82 /usr/local/lib/node_modules/phantomjs/lib/phantom/bin/phantomjs /var/folders/2p/dklw3xys2n3f4hqmx73zvz6w0000gp/T/testacular-61981618/capture.js

我们可以看到睾丸过程仍在运行。

手动杀死它并查看典型的 testacular 关闭输出:

user.name:/my/repo [git: my-branch] $ kill 39639
info: Disconnecting all browsers
error (launcher): Cannot start PhantomJS

user.name:/my/repo [git: my-branch] $ 

有没有办法让 IO.popen 调用，这样我以后就不必手动杀死 testacular 了？

Answer 1

是的，你只需要安装一个signal handler在您的主进程中捕获 Ctrl-C (SIGINT)，然后将该信号发送给子进程。

这个例子应该可以解释一些事情:

# Start child and save its pid
io  = IO.popen("sleep 600")
pid = io.pid

# Print the output of the ps command (just for demonstration)
puts "Checking #{pid} ..."
system("ps #{pid}")

puts "Installing signal handler..."

Signal.trap("INT") {
  # Ctrl-C was pressed...
  puts "Caught interrupt - killing child..."

  # Kill child process...
  Process.kill("INT", pid)

  # This prevents the process from becoming defunct
  io.close

  # Just for demonstration purposes - check that it died
  puts "Checking #{pid} ..."
  system("ps #{pid}")

  # Forward the INT signal back to the parent
  # ...or you could just call "exit" here too.
  puts "Forwarding signal to myself..."
  Signal.trap("INT", "DEFAULT")
  Process.kill("INT", 0)
}

# Make the parent "do some stuff"...
puts "Sleeping parent..."
sleep 600

输出:

> ruby popen_test.rb
Checking 2474 ...
  PID TTY      STAT   TIME COMMAND
 2474 pts/0    S+     0:00 sleep 600
Installing signal handler...
Sleeping parent...

# Press Ctrl-C ...  

Caught interrupt - killing child...
Checking 2474 ...
  PID TTY      STAT   TIME COMMAND
Forwarding signal to myself...
kill.rb:20: Interrupt
        from kill.rb:24:in `call'
        from kill.rb:24:in `sleep'
        from kill.rb:24