Stack.h

#pragma once

#include <windows.h>
#include <stdlib.h>

struct PROC_INFO
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    HANDLE hTerminateEvent;
};

struct stack
{
    PROC_INFO* pr_in;
    stack* next;
};

int empty(stack* head)
{
    return head == NULL;
}

void push(stack** head, PROC_INFO* pr_in)
{
    stack* s = (stack*)malloc(sizeof(stack));
    s->pr_in = pr_in;
    s->next = NULL;

    if (empty(*head))
    {
        *head = s;
        return;
    }

    s->next = *head;
    *head = s;
}

PROC_INFO* pop(stack** head)
{
    if (empty(*head))
    {
        return NULL;
    }

    stack* temp = *head;
    PROC_INFO* pr_in = temp->pr_in;

    *head = temp->next;
    free(temp);

    return pr_in;
}