#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

#define FAIL(x) do { printf(x "\n"); unlink(path); return -1; } while(0)

int main(int argc, char *argv[]) {
    struct stat s1, s2;
    int h, got;
    int sanity;
    const char *path = "/home/larry/testofile";

    if (argc > 1)
        path = argv[1];

    h = open(path, O_WRONLY | O_CREAT);
    if (h < 0)
        FAIL("fail open");
    write(h, "abc", 3);
    close(h);
    got = stat(path, &s1);
    if (got)
        FAIL("fail stat 1");
    utimensat(AT_FDCWD, path, NULL, 0);
    /* utimes(path, NULL); */
    if (got)
        FAIL("fail utimensat");
    stat(path, &s2);
    if (got)
        FAIL("fail stat 2");
    unlink(path);
    printf("Before: %ld %ld\n", s1.st_mtime, s1.st_mtim.tv_nsec);
    printf(" After: %ld %ld\n", s2.st_mtime, s2.st_mtim.tv_nsec);
    sanity = (
            (s1.st_mtime <= s2.st_mtime)
            &&
            (s1.st_mtim.tv_nsec <= s2.st_mtim.tv_nsec)
            );
    printf("Before <= After %d\n", sanity);
    if (!sanity)
        printf("This is insane!\n");
    else
        printf("Everything is okay.\n");
    return 0;
}