#include <iostream>
#include <unistd.h>      // wait, getpid, fork
#include <string.h>      //strcmp
#include <sys/wait.h>    //wait
#include <sys/types.h>   //getpid

using namespace std;

int main(int argc, char * argv[]) {
    int status, exitStatus;

    pid_t childPID;
    int sleepTime;
    int procCount =1;

    int i = 1;
    while (i < argc) {
       if (0 == strcmp("-p",argv[i]) and argv[i+1] != NULL) {
           procCount = atoi(argv[i+1]);
	   i+= 2;
       } else {
          cout << "error " << argv[i] << endl;
	  i++;
       }
    }

    if (procCount < 0 ) {
       procCount = 1;
    } 
    if (procCount > 10) {
       procCount = 10;
    }

    for(i=0;i<procCount ; i++) {
        childPID = fork();
        if (childPID == 0) {
	    // notice, the child initializes the random number generator
            srand(getpid());

            sleepTime = rand() % 5+2;
            cout << "\tChild  " << i << " going to sleep  for "
	         << sleepTime << " sec" << endl;

	    sleep(sleepTime);

	    exitStatus = 1+rand()%255;
	    cout <<"\tChild  " << i << " is exiting with value "
	         << exitStatus << endl;

            // why is return ok here?
	    return exitStatus;
        }
    }

    i = 0;
    while ( i < procCount) {
        cout << "Parent waiting " << endl;
        childPID = wait(&status);
        cout << "Process " << childPID << " exited, this was number "
	     << i << endl; 

        if (WIFEXITED(status)) {
           cout << "The exit status was " << WEXITSTATUS(status) << endl;
        }
        i++;
    }
    return 0;
}