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From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Fri, 31 May 2013 22:09:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r251203 - head/lib/libc/sys
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Author: jilles
Date: Fri May 31 22:09:31 2013
New Revision: 251203
URL: http://svnweb.freebsd.org/changeset/base/251203

Log:
  dup(2): Clarify return value, in particular of dup2().

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

Modified: head/lib/libc/sys/dup.2
==============================================================================
--- head/lib/libc/sys/dup.2	Fri May 31 22:08:25 2013	(r251202)
+++ head/lib/libc/sys/dup.2	Fri May 31 22:09:31 2013	(r251203)
@@ -28,7 +28,7 @@
 .\"     @(#)dup.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd April 21, 2013
+.Dd June 1, 2013
 .Dt DUP 2
 .Os
 .Sh NAME
@@ -113,10 +113,11 @@ is a valid descriptor, then
 .Fn dup2
 is successful, and does nothing.
 .Sh RETURN VALUES
-The value -1 is returned if an error occurs in either call.
-The external variable
+These calls return the new file descriptor if successful;
+otherwise the value -1 is returned and
+the external variable
 .Va errno
-indicates the cause of the error.
+is set to indicate the cause of the error.
 .Sh ERRORS
 The
 .Fn dup