#include <stdio.h>
#include <stdlib.h>
#include <time.h>
enum { len = 12 };
void func(void) {
char id[len];
int r;
int num;
struct timespec ts;
if (timespec_get(&ts, TIME_UTC) == 0) {
}
srandom(ts.tv_nsec ^ ts.tv_sec);
r = random();
num = snprintf(id, len, "ID%-d", r);
}