c++ - 为什么在使用 vfork() 时会出现错误？

Question

这是我的代码...我不知道为什么会出现错误段...有人可以向我解释原因吗？

#include <iostream>

#include <string>

// Required by for routine
#include <sys/types.h>
#include <unistd.h>

using namespace std;


int globalVariable = 2;

main()
{
   string sIdentifier;
   int    iStackVariable = 20;

   pid_t pID = vfork();
   if (pID == 0)                // child
   {
      // Code only executed by child process

      sIdentifier = "Child Process: ";
      globalVariable++;
      iStackVariable++;
      cout << "PROCESO NUMERO"<<getpid()<<sIdentifier;
//          printf("Proceso hijo: PID %d - PPID %d\n", getpid(), getppid());
      cout << " Global variable: " << globalVariable;
      cout << " Stack variable: "  << iStackVariable << endl;
      return (0);
    }
    else if (pID < 0)            // failed to fork
    {
        cerr << "Failed to fork" << endl;
        return (1);
        // Throw exception
    }
    else                                   // parent
    {
      // Code only executed by parent process

      sIdentifier = "Parent Process:";
    }

    // executed only by parent

    cout << sIdentifier;
    cout << " Global variable: " << globalVariable;
    cout << " Stack variable: "  << iStackVariable << endl;
    return (0);
}

Answer 1

是this 使用 ？请注意变量修改的注意事项。

The vfork() function has the same effect as fork(), except that the behaviour is undefined if the process created by vfork() either modifies any data other than a variable of type pid_t used to store the return value from vfork(), or returns from the function in which vfork() was called, or calls any other function before successfully calling _exit() or one of the exec family of functions.