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#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
volatile int ticks = 0;
struct itimerval timert;
struct sigaction timer_action;
void handle_vtalrm(int sig) { ticks++; }
int main(int argc, char* argv[])
{
timer_action.sa_handler = handle_vtalrm;
sigemptyset(&timer_action.sa_mask);
timer_action.sa_flags = SA_RESTART;
sigaction(SIGVTALRM, &timer_action, NULL);
timert.it_interval.tv_sec = timert.it_value.tv_sec = 0;
timert.it_interval.tv_usec = timert.it_value.tv_usec = 500;
setitimer(ITIMER_VIRTUAL, &timert, NULL);
struct timespec ts_initialized = {0, 1000000};
struct timespec* too_small = malloc(1);
clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &ts_initialized,
too_small);
}
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