Lab_3/15var (IV semester) OS&SP

//child.exe
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

int main(int argc, char *argv[])
{
    std::cout << "------------------------" << std::endl;
    std::cout << "Child started" << std::endl;
    char *USERNAME = getenv("USERNAME");
    char *COMPUTERNAME = getenv("COMPUTERNAME");
    char *MYPATH = getenv("MYPATH");
    std::cout << "USERNAME: " << USERNAME << std::endl;
    std::cout << "COMPUTERNAME: " << COMPUTERNAME << std::endl;
    std::cout << "MYPATH: " << MYPATH << std::endl;
    system("pause");
    std::cout << "Child destroyed" << std::endl;
    std::cout << "------------------------" << std::endl;
    return 0;
}

//parent_3_1.exe
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <process.h>

void main(int argc, char *argv[])
{
    std::cout << "Parent_3_1 started" << std::endl;
    putenv("MYPATH=D:\\TEMP");
    std::cout << "Parent_3_1 call <spawnle(int mode, char *fname, char *arg0, ..., char *argN, NULL, char *envp[ ])> child.exe" << std::endl;
    if (spawnle(P_WAIT, "child.exe", argv[0], NULL, NULL, _environ) == -1)
        std::cout << "Error: " << errno << std::endl;
    else
        std::cout << "All is well" << std::endl;
    std::cout << "Parent_3_1 destroyed" << std::endl;
    system("pause");
}

//parent_3_2.exe
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <process.h>

void main(int argc, char *argv[])
{
    std::cout << "Parent_3_2 started" << std::endl;
    putenv("USERNAME=PARENT_2");
    putenv("COMPUTERNAME=OS-LAB-3");
    putenv("MYPATH=D:\\TEMP");
    std::cout << "Parent_3_2 call <spawnle(int mode, char *fname, char *arg0, ..., char *argN, NULL, char *envp[ ])> child.exe" << std::endl;
    if (spawnle(P_WAIT, "child.exe", argv[0], NULL, NULL, _environ) == -1)
        std::cout << "Error: " << errno << std::endl;
    else
        std::cout << "All is well" << std::endl;
    std::cout << "Parent_3_2 destroyed" << std::endl;
    system("pause");
}