Implemented mid-level Negotiate protocol for Posix.

base/native_library_linux.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/native_library.h"
 
 #include <dlfcn.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 27 matching lines @@
   int ret = dlclose(library);
   if (ret < 0) {
     LOG(ERROR) << "dlclose failed: " << dlerror();
     NOTREACHED();
   }
 }
 
 // static
 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
                                           const char* name) {
-  return dlsym(library, name);
+  DCHECK(name != NULL) << "NULL name passed in.";
+  void* lib = dlsym(library, name);
+  return lib;
 }
 
 // static
 string16 GetNativeLibraryName(const string16& name) {
   return ASCIIToUTF16("lib") + name + ASCIIToUTF16(".so");
 }
 
+string16 GetLibraryErrorMessage() {
+  const char* last_err_message = dlerror();
+  string16 err_message;
+
+  if (last_err_message) {
+    err_message = ASCIIToUTF16(last_err_message);
+  }
+
+  return err_message;
+}
+
 }  // namespace base