dlopen.patch

diff --git a/src/library.js b/src/library.js
index 84071b6..ae61697 100644
--- a/src/library.js
+++ b/src/library.js
@@ -5794,7 +5794,7 @@ LibraryManager.library = {
   dlopen: function(filename, flag) {
     // void *dlopen(const char *file, int mode);
     // http://pubs.opengroup.org/onlinepubs/009695399/functions/dlopen.html
-    filename = (ENV['LD_LIBRARY_PATH'] || '/') + Pointer_stringify(filename);
+    filename = filename ? (ENV['LD_LIBRARY_PATH'] || '/') + Pointer_stringify(filename) : '';
 
     if (DLFCN_DATA.loadedLibNames[filename]) {
       // Already loaded; increment ref count and return.
@@ -5803,17 +5803,19 @@ LibraryManager.library = {
       return handle;
     }
 
-    var target = FS.findObject(filename);
-    if (!target || target.isFolder || target.isDevice) {
+    var target = filename ? FS.findObject(filename) : null;
+    if (filename && (!target || target.isFolder || target.isDevice)) {
       DLFCN_DATA.errorMsg = 'Could not find dynamic lib: ' + filename;
       return 0;
-    } else {
+    } else if (filename) {
       FS.forceLoadFile(target);
       var lib_data = intArrayToString(target.contents);
     }
 
     try {
-      var lib_module = eval(lib_data)({{{ Functions.getTable('x') }}}.length);
+      var lib_module = filename
+        ? eval(lib_data)({{{ Functions.getTable('x') }}}.length)
+        : Module;
     } catch (e) {
 #if ASSERTIONS
       Module.printErr('Error in loading dynamic library: ' + e);
@@ -5837,7 +5839,7 @@ LibraryManager.library = {
     DLFCN_DATA.loadedLibNames[filename] = handle;
 
     // We don't care about RTLD_NOW and RTLD_LAZY.
-    if (flag & 256) { // RTLD_GLOBAL
+    if (flag & 256 && Module !== lib_module) { // RTLD_GLOBAL
       for (var ident in lib_module) {
         if (lib_module.hasOwnProperty(ident)) {
           Module[ident] = lib_module[ident];
@@ -7692,5 +7694,3 @@ function autoAddDeps(object, name) {
     }
   }
 }
-
-