将 control+c (SIGINT) 发送到 Objective-C 中的 NSPIPE
我正在尝试终止通过 NSTask 生成的 openvpn 任务。
我的问题：
我应该将 ctrl+c (SIGINT) 发送到我的 NSTask 的输入 NSPipe 吗？
inputPipe = [NSPipe pipe];
taskInput = [inputPipe fileHandleForWriting];
NSString dataString = @"\cC";
[taskInput writeData:[dataString dataUsingEncoding: [NSString defaultCStringEncoding]]];
或者，我正在考虑使用kill(pid,SIGINT);但它会更复杂，因为进程 ID 必须通过绕道来确定（[task processIdentifier] 在这里没有帮助） - 原始 NSTask 调用：
/bin/bash -c sudo -S | mypassword ....
这不好，我知道，但它只被调用一次并且 sudo 密码已经在这种情况下输入了。
I am trying to terminate an openvpn task, spawned via NSTask.
My question:
Should I send ctrl+c (SIGINT) to the input NSPipe for my NSTask?
inputPipe = [NSPipe pipe];
taskInput = [inputPipe fileHandleForWriting];
NSString dataString = @"\cC";
[taskInput writeData:[dataString dataUsingEncoding: [NSString defaultCStringEncoding]]];
Alternatively, I was thinking about using kill( pid, SIGINT ); but it would be much more complicated since the process ID has to be determined via a detour ([task processIdentifier] does not help here) - the original NSTask calls:
/bin/bash -c sudo -S | mypassword ....
That's not nice, I know but it is only called once and the sudo password has been entered in that case already.
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Control-C 和 SIGINT 不是一回事。
对于键盘输入，操作系统中有一个“tty 驱动程序”，它可以执行诸如回显字符、处理删除键等操作。它还可以识别 control-C（或任何
intr字符）并向进程发送 SIGINT。当您有到另一个进程的管道时，不涉及 tty 驱动程序*，因此 control-C 只是作为普通数据传递。
您需要找到 pid 并直接向其发送 SIGINT。当然，您实际上可能没有权限向其发送信号（因为您使用 sudo 以 root 身份运行其他任务）....
*除非您使用伪终端 (pty)，而 NSPipe 没有无论如何你也不想这样做:-)
Control-C and SIGINT are not the same thing.
In the case of keyboard input, there's a "tty driver" in the OS that does things like echoing characters, processing
deletekeys, and so forth. It's also the thing that recognizes the control-C (or whatever yourintrcharacter is) and sends a SIGINT to the process.When you have a pipe to another process, there's no tty driver involved*, so control-C is just passed through as ordinary data.
You will need to locate the pid and send a SIGINT directly to it. Of course, you might not actually have the permissions to do send it the signal (because you used sudo to run the other task as root)....
*unless you're using a pseudo-terminal (pty), which NSPipe doesn't and you don't want to do anyway :-)