diff -ruN mm-1.1.3.orig/mm_core.c mm-1.1.3/mm_core.c
--- mm-1.1.3.orig/mm_core.c	Tue Jun 20 08:55:44 2000
+++ mm-1.1.3/mm_core.c	Wed Jul 24 18:22:39 2002
@@ -249,7 +249,7 @@
 
 #if defined(MM_SHMT_MMPOSX)
     shm_unlink(fnmem); /* Ok when it fails */
-    if ((fdmem = shm_open(fnmem, O_RDWR|O_CREAT, MM_CORE_FILEMODE)) == -1)
+    if ((fdmem = shm_open(fnmem, O_RDWR|O_CREAT|O_EXCL, MM_CORE_FILEMODE)) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to open tempfile");
     if (ftruncate(fdmem, mm_core_mapoffset+size) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to truncate tempfile");
@@ -275,7 +275,7 @@
 
 #if defined(MM_SHMT_MMFILE)
     unlink(fnmem);
-    if ((fdmem = open(fnmem, O_RDWR|O_CREAT, MM_CORE_FILEMODE)) == -1)
+    if ((fdmem = open(fnmem, O_RDWR|O_CREAT|O_EXCL, MM_CORE_FILEMODE)) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to open memory file");
     if (ftruncate(fdmem, mm_core_mapoffset+size) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to truncate memory file");
@@ -303,13 +303,13 @@
 
 #if defined(MM_SEMT_FLOCK)
     unlink(fnsem);
-    if ((fdsem = open(fnsem, O_RDWR|O_CREAT, MM_CORE_FILEMODE)) == -1)
+    if ((fdsem = open(fnsem, O_RDWR|O_CREAT|O_EXCL, MM_CORE_FILEMODE)) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to open semaphore file");
 #endif /* MM_SEMT_FLOCK */
 
 #if defined(MM_SEMT_FCNTL)
     unlink(fnsem);
-    if ((fdsem = open(fnsem, O_RDWR|O_CREAT, MM_CORE_FILEMODE)) == -1)
+    if ((fdsem = open(fnsem, O_RDWR|O_CREAT|O_EXCL, MM_CORE_FILEMODE)) == -1)
         FAIL(MM_ERR_CORE|MM_ERR_SYSTEM, "failed to open semaphore file");
 #endif /* MM_SEMT_FCNTL */