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From: Ian Lepore <ian@FreeBSD.org>
Date: Thu, 21 Jun 2018 15:21:17 +0000 (UTC)
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Subject: svn commit: r335489 - head/lib/libc/sys
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Author: ian
Date: Thu Jun 21 15:21:17 2018
New Revision: 335489
URL: https://svnweb.freebsd.org/changeset/base/335489

Log:
  Add some words clarifying that rename(2) does nothing when the 'from' and
  'to' args are the same file.  Wording borrowed from POSIX.1-2017, but
  the freebsd code to implement this behavior was added in 2002 (r103180).

Modified:
  head/lib/libc/sys/rename.2

Modified: head/lib/libc/sys/rename.2
==============================================================================
--- head/lib/libc/sys/rename.2	Thu Jun 21 15:11:14 2018	(r335488)
+++ head/lib/libc/sys/rename.2	Thu Jun 21 15:21:17 2018	(r335489)
@@ -28,7 +28,7 @@
 .\"     @(#)rename.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd September 15, 2017
+.Dd June 21, 2018
 .Dt RENAME 2
 .Os
 .Sh NAME
@@ -75,6 +75,15 @@ If the final component of
 is a symbolic link,
 the symbolic link is renamed,
 not the file or directory to which it points.
+.Pp
+If
+.Fa from
+and
+.Fa to
+resolve to the same directory entry, or to different directory
+entries for the same existing file,
+.Fn rename
+returns success without taking any further action.
 .Pp
 The
 .Fn renameat