终止NSTask及其子节点 [英] Terminate an NSTask and its children

问题描述

我使用NSTask执行一系列长时间运行的命令，如：

  commandToRun = command2; 
 NSArray * arguments = [NSArray arrayWithObjects：
 @ -  c，
 commandToRun，
 nil]; 
 self.task = [[NSTask alloc] init]; 
 [self.task setLaunchPath：@/ bin / sh]; 
 [self.task setArguments：arguments]; 
 [self.task launch]; 
 

这会为shell创建一个进程，并为当前运行的命令创建一个子进程命令1或命令2）。如果我用 [self.task terminate] 杀死任务，它只会杀死父进程。有什么方法来识别和杀死孩子吗？

解决方案

这不是很优雅，但你可以 sh 子任务作为后台进程，然后使用shell变量 $！按照这里，阻塞直到每个后台进程完成以保持异步：

  commandToRun = @command1& echo $！> / tmp / childpid; wait $ !; command2& echo $！> / tmp / childpid; wait $！; 
  

然后当您调用 [self.task terminate] 您还应该调用：

 系统（kill -9` cat / tmp / childpid`）;   
I'm using NSTask to execute a series of long running commands like so:
commandToRun = @"command 1;command2";
NSArray *arguments = [NSArray arrayWithObjects:
                      @"-c",
                      commandToRun,
                      nil];
self.task = [[NSTask alloc] init];
[self.task setLaunchPath: @"/bin/sh"];
[self.task setArguments: arguments];
[self.task launch];
This creates a process for the shell, and a child process for whichever command is running at the time (command 1 or command 2). If I kill the task with [self.task terminate] it only kills the parent process. Is there a way to identify and kill the children too? 
解决方案
It's not exactly elegant, but you can make sh launch the subtasks as background processes and then write their PIDs to a file using the shell variable $! as per here, blocking till each background process completes to maintain asynchronicity:
commandToRun = @"command1 & echo $! > /tmp/childpid; wait $!; command2 & echo $! > /tmp/childpid; wait $!";
Then when you call [self.task terminate] you should also invoke: 
system("kill -9 `cat /tmp/childpid`");
 ...or something equivalent.

                        
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