#include <iostream>
#include <unistd.h>   // fork
#include <sys/types.h>  // wait
#include <sys/wait.h>  // wait
#include <stdio.h>     // perror
#include <stdlib.h>    // exit


#include <vector>
#include <algorithm>

const int PROCS = 5;

using namespace std;

void ReportStatus(int pid, int status) {
    cout << "\tStatus Report for pid " << pid << endl;
    cout << "\t\t" << pid << " used exit(" 
         << WEXITSTATUS(status) << ")" << endl;

    return;
}

void ReportChildren(vector<pid_t> children){
   int i=0;

   cout << "Still to Exit: ";
   if (children.size() > 0) {
       for(i = 0; i < children.size()-1; i++) {
          cout << children[i] << ", ";
       }

       if (i < children.size()) {
           cout << children[i] << endl;
       }
   } else {
       cout << "none " << endl;
   }
   
   return;
}

int main() {
   vector<pid_t> children;
   vector<pid_t>::iterator j;
   pid_t tmp, pid;
   int status;
   int i;

   int sleepTime;

   i = 0;
   while (i < PROCS) {
       tmp = fork();
       if (tmp ==  -1) {
           perror("Fork");
	   exit(-1);
       }else  if (tmp != 0) {
           // parent.
	   children.push_back(tmp);
	   i++;
       } else {
           i = PROCS;
       }
   }

   if (tmp == 0) {
       // all processes are here right now, 
       // need to srand with something different
       srand(getpid());

       sleepTime = rand() % 10;
       cout <<"\t" << getpid() << " going to sleep for " << sleepTime << endl;
       sleep(sleepTime);
       cout <<"\t" << getpid() << " Is back." << endl;
       status = rand() % 5;
       cout <<"\t" << getpid() << " is exiting with status " << status << endl;
       cout << endl;
       exit(status);
   }

   while(children.size() > 0) {
       ReportChildren(children);
       pid = wait(&status);
       cout <<"\t" << "Process " << pid << " just exited with status " 
            << status << endl;
       ReportStatus(pid, status);
       j = find(children.begin(), children.end(),pid);
       children.erase(j);
   }

   ReportChildren(children);
   return 0;
}