* lib/fts.c (fts_safe_changedir): Add a comment.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/fts.c b/lib/fts.c
index 75bab3c896..bc016d4d98 100644
--- a/lib/fts.c
+++ b/lib/fts.c
@@ -1505,6 +1505,11 @@ fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir)
 	int ret;
 
 	int newfd = fd;
+
+	/* This clause handles the unusual case in which FTS_NOCHDIR
+	   is specified, along with FTS_CWDFD.  In that case, there is
+	   no need to change even the virtual cwd file descriptor.
+	   However, if FD is non-negative, we do close it here.  */
 	if (ISSET(FTS_NOCHDIR)) {
 		if (ISSET(FTS_CWDFD) && 0 <= fd)
 			close (fd);