Clarify closedir()'s treatment of underlying file descriptor.

At the end of the paragraph in opendir(3) describing fdopendir(), I
think it's worth adding "The file descriptor will be closed when
closedir() is called."  It's a bit ambiguous if the file descriptor
is closed or "given back" at closedir time.

(I've tested this and verified that it's true, BTW.)

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

Changes

@@ -10,6 +10,7 @@ The following people contributed notes, ideas, or patches that have
 been incorporated in changes in this release:
 
 André Goddard Rosa <andre.goddard@gmail.com>
+George Spelvin <linux@horizon.com>
 Sam Varshavchik <mrsam@courier-mta.com>
 John Reiser <jreiser@bitwagon.com>
 
@@ -56,6 +57,10 @@ timerfd_create.2
     Sam Varshavchik
         s/it_interval/it_value/ when talking about TIMERFD_ABSTIME.
 
+closedir.3
+    George Spelvin
+        Clarify closedir()'s treatment of underlying file descriptor.
+        
 tsearch.3
     André Goddard Rosa
         Fix memory leak in example program.

man3/closedir.3

@@ -26,7 +26,7 @@
 .\"     386BSD man pages
 .\" Modified Sat Jul 24 21:25:52 1993 by Rik Faith (faith@cs.unc.edu)
 .\" Modified 11 June 1995 by Andries Brouwer (aeb@cwi.nl)
-.TH CLOSEDIR 3  1995-06-11 "" "Linux Programmer's Manual"
+.TH CLOSEDIR 3  2008-09-23 "" "Linux Programmer's Manual"
 .SH NAME
 closedir \- close a directory
 .SH SYNOPSIS
@@ -42,6 +42,10 @@ The
 .BR closedir ()
 function closes the directory stream associated with
 \fIdirp\fP.
+A successful call to
+.BR closedir ()
+also closes the underlying file descripotr associated with
+.IR dirp .
 The directory stream descriptor \fIdirp\fP is not available
 after this call.
 .SH "RETURN VALUE"