From owner-svn-src-head@FreeBSD.ORG  Mon Apr  9 14:17:23 2012
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 170DD1065676;
	Mon,  9 Apr 2012 14:17:23 +0000 (UTC)
	(envelope-from jilles@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 0170E8FC14;
	Mon,  9 Apr 2012 14:17:23 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q39EHMYX063808;
	Mon, 9 Apr 2012 14:17:22 GMT (envelope-from jilles@svn.freebsd.org)
Received: (from jilles@localhost)
	by svn.freebsd.org (8.14.4/8.14.4/Submit) id q39EHM3D063806;
	Mon, 9 Apr 2012 14:17:22 GMT (envelope-from jilles@svn.freebsd.org)
Message-Id: <201204091417.q39EHM3D063806@svn.freebsd.org>
From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Mon, 9 Apr 2012 14:17:22 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r234057 - head/lib/libc/gen
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
	<svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 09 Apr 2012 14:17:23 -0000

Author: jilles
Date: Mon Apr  9 14:17:22 2012
New Revision: 234057
URL: http://svn.freebsd.org/changeset/base/234057

Log:
  sem_open: Make sure to fail an O_CREAT|O_EXCL open, even if that semaphore
  is already open in this process.
  
  If the named semaphore is already open, sem_open() only increments a
  reference count and did not take the flags into account (which otherwise
  happens by passing them to open()). Add an extra check for O_CREAT|O_EXCL.
  
  PR:		kern/166706
  Reviewed by:	davidxu
  MFC after:	10 days

Modified:
  head/lib/libc/gen/sem_new.c

Modified: head/lib/libc/gen/sem_new.c
==============================================================================
--- head/lib/libc/gen/sem_new.c	Mon Apr  9 14:16:24 2012	(r234056)
+++ head/lib/libc/gen/sem_new.c	Mon Apr  9 14:17:22 2012	(r234057)
@@ -162,10 +162,16 @@ _sem_open(const char *name, int flags, .
 	_pthread_mutex_lock(&sem_llock);
 	LIST_FOREACH(ni, &sem_list, next) {
 		if (strcmp(name, ni->name) == 0) {
-			ni->open_count++;
-			sem = ni->sem;
-			_pthread_mutex_unlock(&sem_llock);
-			return (sem);
+			if ((flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) {
+				_pthread_mutex_unlock(&sem_llock);
+				errno = EEXIST;
+				return (SEM_FAILED);
+			} else {
+				ni->open_count++;
+				sem = ni->sem;
+				_pthread_mutex_unlock(&sem_llock);
+				return (sem);
+			}
 		}
 	}