a prelimiary proxy cache support
diff --git a/src/os/unix/ngx_files.h b/src/os/unix/ngx_files.h
index 068b4d8..21e5ff4 100644
--- a/src/os/unix/ngx_files.h
+++ b/src/os/unix/ngx_files.h
@@ -67,6 +67,7 @@
 #define NGX_FILE_APPEND          O_APPEND
 
 #define NGX_FILE_DEFAULT_ACCESS  0644
+#define NGX_FILE_OWNER_ACCESS    0600
 
 
 #define ngx_close_file           close