rewind

/*
 *  call-seq:
 *     dir.rewind => dir
 *
 *  Repositions <em>dir</em> to the first entry.
 *
 *     d = Dir.new("testdir")
 *     d.read     #=> "."
 *     d.rewind   #=> #<Dir:0x401b3fb0>
 *     d.read     #=> "."
 */
static VALUE
dir_rewind(dir)
    VALUE dir;
{
    struct dir_data *dirp;

    if (rb_safe_level() >= 4 && !OBJ_TAINTED(dir)) {
        rb_raise(rb_eSecurityError, "Insecure: can't close");
    }
    GetDIR(dir, dirp);
    rewinddir(dirp->dir);
    return dir;
}