+ /* Use this flag to enable semantics with which the parent
+ application may be made both more efficient and more robust.
+ Whereas the default is to visit each directory in a recursive
+ traversal (via chdir), using this flag makes it so the initial
+ working directory is never changed. Instead, these functions
+ perform the traversal via a virtual working directory, maintained
+ through the file descriptor member, fts_cwd_fd. */
+# define FTS_CWDFD 0x0200
+
+ /* Historically, for each directory that fts initially encounters, it would
+ open it, read all entries, and stat each entry, storing the results, and
+ then it would process the first entry. But that behavior is bad for
+ locality of reference, and also causes trouble with inode-simulating
+ file systems like FAT, CIFS, FUSE-based ones, etc., when entries from
+ their name/inode cache are flushed too early.
+ Use this flag to make fts_open and fts_read defer the stat/lstat/fststat
+ of each entry until it actually processed. However, note that if you use
+ this option and also specify a comparison function, that function may not
+ examine any data via fts_statp. */
+# define FTS_DEFER_STAT 0x0400
+
+# define FTS_OPTIONMASK 0x07ff /* valid user option mask */