From e95d57f39c731e2cd27aa8f604db4ad96e1c3049 Mon Sep 17 00:00:00 2001
From: Hallvard Furuseth <hallvard@openldap.org>
Date: Tue, 2 Jun 2015 20:51:03 +0200
Subject: [PATCH] Use ftok() for semget(), and only lower mode bits

---
 libraries/liblmdb/mdb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 482b98e..cc0944d 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -4548,7 +4548,10 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
 		if (!env->me_wmutex) goto fail_errno;
 #elif defined(MDB_USE_SYSV_SEM)
 		unsigned short vals[2] = {1, 1};
-		semid = semget(IPC_PRIVATE, 2, mode);
+		key_t key = ftok(lpath, 'M');
+		if (key == -1)
+			goto fail_errno;
+		semid = semget(key, 2, (mode & 0777) | IPC_CREAT);
 		if (semid < 0)
 			goto fail_errno;
 		semu.array = vals;