1 files changed, 3 insertions, 0 deletions
diff --git a/lib/win32/emu.h b/lib/win32/emu.h
index 5b3e2280..0612e441 100644
--- a/lib/win32/emu.h
+++ b/lib/win32/emu.h
@@ -290,6 +290,9 @@ DIR *opendir(const char *name);
 struct dirent *readdir(DIR *dp);
 int closedir(DIR *dp);
 
+// local constant to open file exclusively without shared access
+#define O_LOCK 0x10000
+
 HANDLE openfile(const char *filename, int flags, int mode);
 
 #define LOG_INFO 6