From 1d73bec4c1de40b38225913b26eca78e600a482f Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sat, 17 Mar 2012 23:55:18 +0000
Subject: [PATCH] Do not claim that msync(2) is obsoleted [1]. Document EIO
 from msync(2).

Inspired by PR:	 docs/165929 [1]
Reviewed by:	 jilles
MFC after:	 2 weeks
---
 lib/libc/sys/mmap.2  | 4 ++--
 lib/libc/sys/msync.2 | 7 +++++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/libc/sys/mmap.2 b/lib/libc/sys/mmap.2
index e66f12807b7..73ffb2ead67 100644
--- a/lib/libc/sys/mmap.2
+++ b/lib/libc/sys/mmap.2
@@ -28,7 +28,7 @@
 .\"	@(#)mmap.2	8.4 (Berkeley) 5/11/95
 .\" $FreeBSD$
 .\"
-.Dd August 28, 2010
+.Dd March 18, 2012
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -205,7 +205,7 @@ command and
 system call generally do not flush dirty NOSYNC VM data.
 The
 .Xr msync 2
-system call is obsolete since
+system call is usually not needed since
 .Bx
 implements a coherent file system buffer cache.
 However, it may be
diff --git a/lib/libc/sys/msync.2 b/lib/libc/sys/msync.2
index cb1592575b5..42d8005418d 100644
--- a/lib/libc/sys/msync.2
+++ b/lib/libc/sys/msync.2
@@ -28,7 +28,7 @@
 .\"	@(#)msync.2	8.2 (Berkeley) 6/21/94
 .\" $FreeBSD$
 .\"
-.Dd June 21, 1994
+.Dd March 18, 2012
 .Dt MSYNC 2
 .Os
 .Sh NAME
@@ -98,6 +98,9 @@ The
 argument
 was both MS_ASYNC and MS_INVALIDATE.
 Only one of these flags is allowed.
+.It Bq Er EIO
+ An error occurred while writing at least one of the pages in
+the specified region.
 .El
 .Sh SEE ALSO
 .Xr madvise 2 ,
@@ -113,7 +116,7 @@ system call first appeared in
 .Sh BUGS
 The
 .Fn msync
-system call is obsolete since
+system call is usually not needed since
 .Bx
 implements a coherent file system buffer cache.
 However, it may be used to associate dirty VM pages with file system
-- 
2.45.2