Loads and unloads .so files.

webkit/glue/plugins/plugin_lib_linux.cc

Index: webkit/glue/plugins/plugin_lib_linux.cc
diff --git a/webkit/glue/plugins/plugin_lib_linux.cc b/webkit/glue/plugins/plugin_lib_linux.cc
index 47d6ebf2896d789813595a443f4caa5dcbb00870..e3a5c07b2497932fdba0242e1b7c14dcd71b453f 100644
--- a/webkit/glue/plugins/plugin_lib_linux.cc
+++ b/webkit/glue/plugins/plugin_lib_linux.cc
@@ -6,6 +6,9 @@
 
 #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"
@@ -15,21 +18,25 @@ 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,
@@ -37,10 +44,42 @@ bool PluginLib::ReadWebPluginInfo(const FilePath& filename,
                                   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;
 }