#include<stdio.h>

 #include<iostream>

 #include <fcntl.h>

 #include <sys/mman.h>

 using namespace std;

 int main(int argc,char* argv[])

 {

     ssize_t bytesToWrite = **;

     const char *pathZero = "/dev/zero";

     int fdZero = open(pathZero, O_RDONLY);

     void *pageBuffPtr = mmap(NULL, bytesToWrite, PROT_READ | PROT_WRITE, MAP_PRIVATE, fdZero, );

     int randomData = open("/dev/urandom", O_RDONLY);

     if (randomData < )

     {

         // something went wrong

     }

     else

     {

         char* myRandomData;

         ssize_t result = read(randomData, pageBuffPtr, bytesToWrite);

         if (result < )

         {

             // something went wrong

         }

         cout <<"len:"<<bytesToWrite << endl;

         cout <<"result:"<<result << endl;

     }

     return ;

 }