#include <sys/event.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>

#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

struct inf_kevent {
    uintptr_t ident;
    short filter;
    u_short flags;
    u_int fflags;
    int64_t data;
    void *udata;
    u_int64_t ext[4];
};

struct addrinfo *add;
struct addrinfo hints;

void inf_info(const char *s);

int main(void) {
    struct kevent event;
    struct kevent change;
    pid_t pid;
    int kq, nev;

    printf("\n");
    printf("---------------------------------------\n");
    printf("Stupid struct\n");
    printf("---------------------------------------\n");
    printf("\n");


    if ((kq = kqueue()) == -1){
        inf_info("kqueue()");
    }

    EV_SET(&change, 1, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0, 2000, 0);

    for (;;) {

        nev = kevent(kq, &change, 1, &event, 1, NULL);

        printf("--> kq %d\n", kq);
        printf("--> pid %d\n", pid);

        if (nev < 0){
            inf_info("kevent()");
        }

        else if (nev > 0) {

            if (event.flags & EV_ERROR) {
                fprintf(stderr, "EV_ERROR...");
                exit(EXIT_FAILURE);
            }

            if ((pid = fork()) < 0 ) {
                fprintf(stderr, "EV_ERROR...");
                exit(EXIT_FAILURE);
            }

            else if (pid == 0) {
                if (execlp("date", "date", (char *)0) < 0)
                    inf_info("execplp()");
            }

        }
    }
    close(kq);
}

void inf_info(const char *s)
{
    perror(s);
    exit(EXIT_FAILURE);
}