Loads and unloads .so files.

webkit/glue/plugins/plugin_lib_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 "config.h"
 
 #include "webkit/glue/plugins/plugin_lib.h"
 
+#include <dlfcn.h>
+#include <errno.h>
+
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "webkit/glue/plugins/plugin_list.h"
 
 namespace NPAPI {
 
 // static
 PluginLib::NativeLibrary PluginLib::LoadNativeLibrary(
     const FilePath& library_path) {
-  NOTIMPLEMENTED();
-  return NULL;
+  void* dl = dlopen(library_path.value().c_str(), RTLD_LAZY);
+  if (!dl)
+    NOTREACHED() << "dlopen failed: " << strerror(errno);
+
+  return dl;
 }
 
 // static
 void PluginLib::UnloadNativeLibrary(NativeLibrary library) {
-  NOTIMPLEMENTED();
+  int ret = dlclose(library);
+  if (ret < 0)
+    NOTREACHED() << "dlclose failed: " << strerror(errno);
 }
 
 // static
 void* PluginLib::GetFunctionPointerFromNativeLibrary(
     NativeLibrary library,
     NativeLibraryFunctionNameType name) {
-  NOTIMPLEMENTED();
-  return NULL;
+  return dlsym(library, name);
 }
 
 bool PluginLib::ReadWebPluginInfo(const FilePath& filename,
                                   WebPluginInfo* info,
                                   NP_GetEntryPointsFunc* np_getentrypoints,
                                   NP_InitializeFunc* np_initialize,
                                   NP_ShutdownFunc* np_shutdown) {
+  // The file to reference is:
+  // http://mxr.mozilla.org/firefox/source/modules/plugin/base/src/nsPluginsDirUnix.cpp
+
   *np_getentrypoints = NULL;
   *np_initialize = NULL;
   *np_shutdown = NULL;
 
+  void* dl = LoadNativeLibrary(filename);
+  if (!dl)
+    return false;
+
+  void* ns_get_factory = GetFunctionPointerFromNativeLibrary(dl,
+                                                             "NSGetFactory");
+
+  if (ns_get_factory) {
+    // Mozilla calls this an "almost-new-style plugin", then proceeds to
+    // poke at it via XPCOM.  Our testing plugin doesn't use it.
+    NOTIMPLEMENTED() << ": " << filename.value()
+                     << " is an \"almost-new-style plugin\".";
+    UnloadNativeLibrary(dl);

[jam, 2009/01/23 01:54:10]

I'm not sure you want to do this.  On Windows at least, some NPAPI plugins such
as Java also expose XPCOM functionality.  You wouldn't want to unload them just
because they do.

+    return false;
+  }
+
+  // See comments in plugin_lib_mac regarding this symbol.
+  typedef const char* (*GetMimeDescriptionType)();
+  GetMimeDescriptionType ns_get_mime_description =
+      reinterpret_cast<GetMimeDescriptionType>(
+          GetFunctionPointerFromNativeLibrary(dl, "NP_GetMIMEDescription"));
+  const char* description = "";
+  if (ns_get_mime_description)
+    description = ns_get_mime_description();
+
+  // TODO(port): pick up from here.
+  LOG(INFO) << description;
+  NOTIMPLEMENTED();
+  UnloadNativeLibrary(dl);
   return false;
 }
 
 }  // namespace NPAPI