#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int childMain(void* args) {
    return 0;
}

void spawnZombies(int number) {
    int numForks = 0;
    int neverStop;
    int forkResult;

    if(number > 0) {
        printf("I will try to spawn %d zombies.\n", number);
        neverStop = 0;
    } else if(number == 0) {
        printf("I will spawn as many zombies as possible.\n");
        neverStop = 1;
    } else {
        printf("I have no idea what to do, doing nothing instead!");
        return;
    }

    while(neverStop == 1 || numForks < number) {
        //forkResult = clone(childMain, (void*) NULL, 0, (void*) NULL, (pid_t*) NULL, (struct user_desc*) NULL, (pid_t*) NULL);
        forkResult = fork();

        switch(forkResult) {
            case -1:
                // Forking did not work
                break;
            case 0:
                // Child process at work, let's end this.
                exit(0);
                break;
            default:
                // Parent shall continue forking ...
                numForks++;
                break;
        }

    }
}

int main(int argc, char* argv[]) {
    int targetNumber;
    if(argc == 2) {
        targetNumber = atoi(argv[1]);
    } else {
        printf("Usage: %s number, pass 0 to spawn as many zombies as possible\n", argv[0]);
	return 1;
    }

    spawnZombies(targetNumber);    

    printf("All zombies have been spawned. Use CTRL+C to exit.\n");

    // Wait
    while(1) {
        sleep(60);
    }

    // That's it. Let somebody else clean up this mess.
    return 0;
}