imprecise mark and sweep native memory leak detector
libmemunreachable uses an imprecise mark and sweep pass over all memory
allocated by jemalloc in order to find unreachable allocations.
Bug: 27208635
Change-Id: Ia70bbf31f5b40ff71dab28cfd6cd06c5ef01a2d4
(cherry picked from commit bcb4ed3eaa92d23949d4ab33dbf1b2604bba8a18)
diff --git a/libmemunreachable/ScopedPipe.h b/libmemunreachable/ScopedPipe.h
new file mode 100644
index 0000000..9beef9a
--- /dev/null
+++ b/libmemunreachable/ScopedPipe.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2016 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 LIBMEMUNREACHABLE_SCOPED_PIPE_H_
+#define LIBMEMUNREACHABLE_SCOPED_PIPE_H_
+
+#include <unistd.h>
+
+#include "log.h"
+
+class ScopedPipe {
+ public:
+ ScopedPipe() : pipefd_{-1, -1} {
+ int ret = pipe2(pipefd_, O_CLOEXEC);
+ if (ret < 0) {
+ LOG_ALWAYS_FATAL("failed to open pipe");
+ }
+ }
+ ~ScopedPipe() {
+ Close();
+ }
+
+ ScopedPipe(ScopedPipe&& other) {
+ SetReceiver(other.ReleaseReceiver());
+ SetSender(other.ReleaseSender());
+ }
+
+ ScopedPipe& operator = (ScopedPipe&& other) {
+ SetReceiver(other.ReleaseReceiver());
+ SetSender(other.ReleaseSender());
+ return *this;
+ }
+
+ void CloseReceiver() {
+ close(ReleaseReceiver());
+ }
+
+ void CloseSender() {
+ close(ReleaseSender());
+ }
+
+ void Close() {
+ CloseReceiver();
+ CloseSender();
+ }
+
+ int Receiver() { return pipefd_[0]; }
+ int Sender() { return pipefd_[1]; }
+
+ int ReleaseReceiver() {
+ int ret = Receiver();
+ SetReceiver(-1);
+ return ret;
+ }
+
+ int ReleaseSender() {
+ int ret = Sender();
+ SetSender(-1);
+ return ret;
+ }
+
+ private:
+ void SetReceiver(int fd) { pipefd_[0] = fd; };
+ void SetSender(int fd) { pipefd_[1] = fd; };
+
+ int pipefd_[2];
+};
+#endif