Load libraries in breadth-first order
This patch fixes the problem with symbol search order
for dlsym(RTLD_DEFAULT/RTLD_NEXT, .) by loading libraries
and ld_preloads in correct order.
Bug: https://code.google.com/p/android/issues/detail?id=74255
Change-Id: I4cf84c70dbaabe99310230dfda12385ae5401859
diff --git a/libc/private/ScopeGuard.h b/libc/private/ScopeGuard.h
new file mode 100644
index 0000000..183e322
--- /dev/null
+++ b/libc/private/ScopeGuard.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SCOPE_GUARD_H
+#define SCOPE_GUARD_H
+
+// TODO: include explicit std::move when it becomes available
+template<typename F>
+class ScopeGuard {
+ public:
+ ScopeGuard(F f) : f_(f), active_(true) {}
+
+ ScopeGuard(ScopeGuard&& that) : f_(that.f_), active_(that.active_) {
+ that.active_ = false;
+ }
+
+ ~ScopeGuard() {
+ if (active_) {
+ f_();
+ }
+ }
+
+ void disable() {
+ active_ = false;
+ }
+ private:
+ F f_;
+ bool active_;
+
+ ScopeGuard() = delete;
+ ScopeGuard(const ScopeGuard&) = delete;
+ ScopeGuard& operator=(const ScopeGuard&) = delete;
+};
+
+template<typename T>
+ScopeGuard<T> create_scope_guard(T f) {
+ return ScopeGuard<T>(f);
+}
+
+#endif // SCOPE_GUARD_H