test-poll.c

#include <poll.h>
#include <stdio.h>

#include <sys/time.h>


#define SECONDS_TO_MICRO 1000000

int main(int argc, char *argv[])
{
    struct timeval before, after;
    int rc;
    size_t us;

    gettimeofday(&before, NULL);
    rc = poll(NULL, 0, 500); /* Sleep 500 ms */
    gettimeofday(&after, NULL);

    us = (after.tv_sec - before.tv_sec) * SECONDS_TO_MICRO + (after.tv_usec - before.tv_usec);

    if(us < 400000) {
        printf("poll() is broken\n");
        return 1;
    }
    printf("poll() works\n");
    return 0;
}