#include <sys/select.h>
#include <sys/time.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
static void d(int s){} 
int main(void){
    struct timeval tv; fd_set r; int p[2]; double t0;
    struct timespec ts;
    pipe(p); FD_ZERO(&r); FD_SET(p[0], &r);
    signal(SIGALRM, d); alarm(30);
    /* T8: select tstohz path, 2^62 us unnormalized */
    tv.tv_sec = 0; tv.tv_usec = 4611686018427387904LL;
    clock_gettime(CLOCK_MONOTONIC, &ts); t0 = ts.tv_sec + ts.tv_nsec/1e9;
    int rc = select(p[0]+1, &r, NULL, NULL, &tv);
    clock_gettime(CLOCK_MONOTONIC, &ts);
    printf("T8 select{ 0s, 2^62us }  rc=%d errno=%d elapsed=%.6f\n",
        rc, errno, ts.tv_sec + ts.tv_nsec/1e9 - t0);
    return 0;
}