fork_test.cpp

Linux process and thread programming

#include <iostream>
#include <string>

#include <sys/types.h>
#include <unistd.h>

using namespace std;

int globalVariable = 2;

main ()
{
   string sIdentifier;
   int iStackVariable = 20;
		
 //  struct task_struct task;
   pid_t pID = fork();
   if (pID == 0)                // child
   {
      // Code only executed by child process      
       sIdentifier = "Child Process: ";
       globalVariable++;
       iStackVariable++;
    }
    else if (pID < 0)            // failed to fork
    {
      cerr << "Failed to fork" << endl;
      exit(1);
      // Throw exception
    }
    else                        // parent
    {
      // Code only executed by parent process
      sIdentifier = "Parent Process:";
    }
   
    // Code executed by both parent and child.
    cout << sIdentifier;
    cout << " Global variable: " << globalVariable;
    cout << " Stack variable: "  << iStackVariable << endl;
  
    int temp;
    temp=getpid();	
    cout<<"pid: "<<temp<<endl;	

}