C ++：在SIGINT后继续执行 [英] C++: Continue execution after SIGINT

问题描述

好吧，我在写一个程序，做一些相当繁重的分析，我想能够迅速停止。

Okay, I am writing a program that is doing some pretty heavy analysis and I would like to be able to stop it quickly.

我添加了 signal（SIGINT，terminate）; 到main的开头并定义终止如：

I added signal(SIGINT, terminate); to the beginning of main and defined terminate like:

void terminate(int param){
   cout << endl << endl << "Exit [N]ow, or [A]fter this url?" << endl;
   std::string answer;
   cin >> answer;
   if(answer[0] == 'n' || answer[0] == 'N'){
      terminateParser();
      exit(1);
   }else if(answer[0] == 'a' || answer[0] == 'A'){
      quitAfterUrl = true;
   }
}

在linux中，即等待用户输入。

In linux, this worked as I expected it to, that is it waited for user input. But when I try to do the same in windows, it shows the message and exits anyway.

有没有办法阻止SIGINT立即关闭程序？

Is there any way to stop SIGINT from closing the program immediately?

更新：

当我尝试

BOOL WINAPI handler(DWORD dwCtrlType)
{
  if (CTRL_C_EVENT == dwCtrlType)
  {
    // ask the user
  }
  return FALSE;
}

as Gregory suggested, the program still unceremoniously exited without stopping for user input.

更新2：
我不知道是什么，但是代码现在正在工作。感谢大家的帮助。

Update 2: I am not exactly sure what did it, but the code is working now. Thank you all for the help.

推荐答案

从MSDN：

注意 SIGINT不适用于任何Win32应用程序，包括Windows 98 / Me和Windows NT / 2000 / XP。当发生CTRL + C中断时，Win32操作系统会生成一个新的线程来专门处理该中断。这可能会导致单线程应用程序（如UNIX）变为多线程，导致意外的行为。

Note SIGINT is not supported for any Win32 application, including Windows 98/Me and Windows NT/2000/XP. When a CTRL+C interrupt occurs, Win32 operating systems generate a new thread to specifically handle that interrupt. This can cause a single-thread application such as UNIX, to become multithreaded, resulting in unexpected behavior.

这意味着您必须使用预处理指令并实施 Windows特定解决方案 。

Which means you will have to use preprocessing directive and implement a Windows specific solution.

BOOL WINAPI handler(DWORD dwCtrlType)
{
  if (CTRL_C_EVENT == dwCtrlType)
  {
    // ask the user
  }
  return FALSE;
}

并在 main 你做

SetConsoleCtrlHandler(handler, TRUE);

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