Index: lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
===================================================================
--- lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
+++ lldb/source/Plugins/Platform/MacOSX/objcxx/PlatformiOSSimulatorCoreSimulatorSupport.mm
@@ -426,9 +426,9 @@
         if (created_fd >= 0) {
           auto file_options = File::OpenOptions(0);
           if ((oflag & O_RDWR) || (oflag & O_RDONLY))
-            file_options |= File::eOpenOptionRead;
+            file_options |= File::eOpenOptionReadOnly;
           if ((oflag & O_RDWR) || (oflag & O_RDONLY))
-            file_options |= File::eOpenOptionWrite;
+            file_options |= File::eOpenOptionWriteOnly;
           file = std::make_shared<NativeFile>(created_fd, file_options, true);
           [options setValue:[NSNumber numberWithInteger:created_fd] forKey:key];
           return error; // Success