From e28334cee7a22d215eec26710a7dd32319b622f3 Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Wed, 15 Dec 2004 13:24:42 +0000
Subject: [PATCH] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=204292

[[
swapon(2) indicates that EINVAL wil lbe returned only if the path
specified does not exist or is not a block device.

The kernel will also return EINVAL is a swap signature is not detected
on the indicated path as well.
]]
---
 man2/swapon.2 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/man2/swapon.2 b/man2/swapon.2
index cf4e9f4bc..838cc9281 100644
--- a/man2/swapon.2
+++ b/man2/swapon.2
@@ -98,10 +98,16 @@ On success, zero is returned.  On error, \-1 is returned, and
 is set appropriately.
 .SH ERRORS
 .TP
+.B EBUSY
+The specified
+.I path
+is already being used as a swap area.
+.TP
 .B EINVAL
 The file
 .I path
-exists, but refers neither to a regular file nor to a block device.
+exists, but refers neither to a regular file nor to a block device;
+or, the indicated path does not contain a valid swap signature.
 .TP
 .B ENFILE
 The system limit on the total number of open files has been reached.