int alloc(void)
{
    int chyba = 0;

    if(((s_state = mmap(NULL, sizeof(sem_t), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 0)) == MAP_FAILED) ||
    ((s_check = mmap(NULL, sizeof(sem_t), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 0)) == MAP_FAILED))
        chyba = 1;

    if (chyba == 0)
    {
        if((sem_init(s_state, 0, 1) == -1) || //inicializacia semaforov
        (sem_init(s_check, 0, 1) == -1))
            chyba = 1;
    }

    if (chyba == 0)
    {
        if(((shm_state = shmget(IPC_PRIVATE, sizeof(int), IPC_CREAT | IPC_EXCL | 0666)) == -1) || //zdielana pamat
		((p_state = (int *) shmat(shm_state, NULL, 0)) == NULL)
		|| ((shm_first_user = shmget(IPC_PRIVATE, sizeof(int), IPC_CREAT | IPC_EXCL | 0666)) == -1) ||
		((first_user = (bool *) shmat(shm_first_user, NULL, 0)) == NULL))
            chyba = 1;
    }

    return chyba;
}

/*
* uvolnenie zdrojov - semafory a zdielana pamat
*/
void free_all(void)
{
    int chyba = 0;
    if((sem_destroy(s_state) == -1) || //znicenie semaforov
    (sem_destroy(s_check) == -1))
        chyba = 1;

    if((shmctl(shm_state, IPC_RMID, NULL) == -1) || //znicenie zdielanej pamate
	(shmctl(shm_first_user, IPC_RMID, NULL) == -1))
        chyba = 1;

    if (chyba == 1)
    {
        err(E_SYS, "semafory a zdielana pamat");
    }
}