Quoted from man getdents on a Ubuntu box:

       This  is  not  the  function you are interested in.  Look at readdir(3) for the POSIX conforming C library 
interface.  This
       page documents the bare kernel system call interface.


And from man futimes:

NAME
       futimes - change access and/or modification times of an open file

SYNOPSIS
       #include <sys/time.h>

       int futimes(int fd, const struct timeval tv[2]);

DESCRIPTION
       futimes()  changes  the  access and modification times of a file in the same way as utimes(2), with the 
difference that the
       file whose timestamps are to be changed is specified via a file descriptor, fd, rather than via a pathname.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.
[...]
CONFORMING TO
       4.2BSD.  Other than Linux, this function is only available on the BSDs.

SEE ALSO
       futimesat(2), utime(2)