Linux: split GNOME Keyring integration into a separate process.

chrome/browser/password_manager/keyring_proxy/gnome_keyring_loader.cc

+// Copyright (c) 2011 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 "chrome/browser/password_manager/keyring_proxy/gnome_keyring_loader.h"
+
+#include <dlfcn.h>
+#include <stdio.h>
+
+namespace keyring_proxy {
+
+#define GNOME_KEYRING_DEFINE_POINTER(name) \
+  typeof(&::gnome_keyring_##name) GnomeKeyringLoader::gnome_keyring_##name;
+GNOME_KEYRING_FOR_EACH_FUNC(GNOME_KEYRING_DEFINE_POINTER)
+#undef GNOME_KEYRING_DEFINE_POINTER
+
+bool GnomeKeyringLoader::keyring_loaded = false;
+
+#if defined(DLOPEN_GNOME_KEYRING)
+
+#define GNOME_KEYRING_FUNCTION_INFO(name) \
+  {"gnome_keyring_"#name, reinterpret_cast<void**>(&gnome_keyring_##name)},
+const GnomeKeyringLoader::FunctionInfo GnomeKeyringLoader::functions[] = {
+  GNOME_KEYRING_FOR_EACH_FUNC(GNOME_KEYRING_FUNCTION_INFO)
+  {NULL, NULL}
+};
+#undef GNOME_KEYRING_FUNCTION_INFO
+
+// Load the library and initialize the function pointers.
+bool GnomeKeyringLoader::LoadGnomeKeyring() {
+  if (keyring_loaded)
+    return true;
+
+  void* handle = dlopen("libgnome-keyring.so.0", RTLD_NOW | RTLD_GLOBAL);
+  if (!handle) {
+    // We wanted to use GNOME Keyring, but we couldn't load it. Warn, because
+    // either the user asked for this, or we autodetected it incorrectly. (Or
+    // the system has broken libraries, which is also good to warn about.)
+    fprintf(stderr, "Could not load libgnome-keyring.so.0: %s\n", dlerror());
+    return false;
+  }
+
+  for (size_t i = 0; functions[i].name; ++i) {
+    dlerror();
+    *functions[i].pointer = dlsym(handle, functions[i].name);
+    const char* error = dlerror();
+    if (error) {
+      fprintf(stderr, "Unable to load symbol %s: %s\n",
+              functions[i].name, error);
+      dlclose(handle);
+      return false;
+    }
+  }
+
+  keyring_loaded = true;
+  // We leak the library handle. That's OK: this function is called only once.
+  return true;
+}
+
+#else  // defined(DLOPEN_GNOME_KEYRING)
+
+bool GnomeKeyringLoader::LoadGnomeKeyring() {
+  if (keyring_loaded)
+    return true;
+#define GNOME_KEYRING_ASSIGN_POINTER(name) \
+  gnome_keyring_##name = &::gnome_keyring_##name;
+  GNOME_KEYRING_FOR_EACH_FUNC(GNOME_KEYRING_ASSIGN_POINTER)
+#undef GNOME_KEYRING_ASSIGN_POINTER
+  keyring_loaded = true;
+  return true;
+}
+
+#endif  // defined(DLOPEN_GNOME_KEYRING)
+
+}  // namespace keyring_proxy