From f9fc10b394cdfbfc6f47c8b334872408e9a6bf22 Mon Sep 17 00:00:00 2001
From: Isaac Connor <isaac@zoneminder.com>
Date: Fri, 22 Jan 2021 12:11:19 -0500
Subject: [PATCH] When not capturing don't try to create mmap. Fixes #3112

---
 src/zm_monitor.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/zm_monitor.cpp b/src/zm_monitor.cpp
index 0630939db..2f35a053c 100644
--- a/src/zm_monitor.cpp
+++ b/src/zm_monitor.cpp
@@ -557,7 +557,12 @@ bool Monitor::connect() {
   Debug(3, "Connecting to monitor.  Purpose is %d", purpose );
 #if ZM_MEM_MAPPED
   snprintf(mem_file, sizeof(mem_file), "%s/zm.mmap.%d", staticConfig.PATH_MAP.c_str(), id);
-  map_fd = open(mem_file, O_RDWR|O_CREAT, (mode_t)0660);
+  if ( purpose != CAPTURE ) {
+    map_fd = open(mem_file, O_RDWR);
+  } else {
+    map_fd = open(mem_file, O_RDWR|O_CREAT, (mode_t)0660);
+  }
+
   if ( map_fd < 0 ) {
     Error("Can't open memory map file %s, probably not enough space free: %s", mem_file, strerror(errno));
     return false;