void irq_handler(int n, siginfo_t *info, void *unused)
{
    //every minute
    counter++;
    dht_request_data();
}

void dht_request_data()
{
    int fd=open("/sys/kernel/debug/irq-dht", O_WRONLY);
    sprintf(buf, "%d %u", DHT_GPIO, getpid()); // gpio-dht-handler kernel module
    write(fd, buf, strlen(buf) + 1);
    close(fd);
}

void dht_handler(int n, siginfo_t *info, void *unused)
{
    if (info->si_int == 0) // DHT protocol CRC error
    {
        if (++failcounter > 10)
        {
            printf("Error retrieving data from DHT sensor\n");
            failcounter = 0;
            return;
        }
        usleep(3000000); // wait 3 seconds between attempts
        dht_request_data();
        return;
    }

    float humidity = (float)((info->si_int) >> 16)/10.0; // 2xMSB
    float temperature = (float)((info->si_int) & 0xFFFF)/10.0; //2xLSB

    // ...
}

int main(int argc, char* argv[])
{
    int timer = TIMER_TIMER;
    int tick = 1000*1000; // 1 sec
    unsigned int timeout = 1000*1000*60; // 60 sec

    if (!init_handler(timer, tick, timeout))
    {
        printf("Error initializing timer %d\n", timer);
        return -1;
    }

    struct sigaction sig;
    sig.sa_sigaction = dht_handler;
    sig.sa_flags = SA_SIGINFO | SA_NODEFER;
    sigaction(SIG_DHT_IRQ, &sig, NULL);

    // ...
}