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-rw-r--r--libs/binderdebug/Android.bp28
-rw-r--r--libs/binderdebug/BinderDebug.cpp119
-rw-r--r--libs/binderdebug/TEST_MAPPING7
-rw-r--r--libs/binderdebug/include/binderdebug/BinderDebug.h37
-rw-r--r--libs/binderdebug/tests/Android.bp30
-rw-r--r--libs/binderdebug/tests/android/binderdebug/test/IControl.aidl22
-rw-r--r--libs/binderdebug/tests/binderdebug_test.cpp90
7 files changed, 333 insertions, 0 deletions
diff --git a/libs/binderdebug/Android.bp b/libs/binderdebug/Android.bp
new file mode 100644
index 0000000000..343246a324
--- /dev/null
+++ b/libs/binderdebug/Android.bp
@@ -0,0 +1,28 @@
+// Copyright (C) 2020 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.
+
+cc_library {
+ name: "libbinderdebug",
+ vendor_available: true,
+ shared_libs: [
+ "libbase",
+ "libbinder",
+ ],
+ srcs: [
+ "BinderDebug.cpp",
+ ],
+ export_include_dirs: [
+ "include",
+ ],
+}
diff --git a/libs/binderdebug/BinderDebug.cpp b/libs/binderdebug/BinderDebug.cpp
new file mode 100644
index 0000000000..b435dba197
--- /dev/null
+++ b/libs/binderdebug/BinderDebug.cpp
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include <android-base/parseint.h>
+#include <android-base/strings.h>
+#include <binder/Binder.h>
+#include <sys/types.h>
+#include <fstream>
+#include <regex>
+
+#include <binderdebug/BinderDebug.h>
+
+namespace android {
+
+static std::string contextToString(BinderDebugContext context) {
+ switch (context) {
+ case BinderDebugContext::BINDER:
+ return "binder";
+ case BinderDebugContext::HWBINDER:
+ return "hwbinder";
+ case BinderDebugContext::VNDBINDER:
+ return "vndbinder";
+ default:
+ return std::string();
+ }
+}
+
+static status_t scanBinderContext(pid_t pid, const std::string& contextName,
+ std::function<void(const std::string&)> eachLine) {
+ std::ifstream ifs("/dev/binderfs/binder_logs/proc/" + std::to_string(pid));
+ if (!ifs.is_open()) {
+ ifs.open("/d/binder/proc/" + std::to_string(pid));
+ if (!ifs.is_open()) {
+ return -errno;
+ }
+ }
+ static const std::regex kContextLine("^context (\\w+)$");
+
+ bool isDesiredContext = false;
+ std::string line;
+ std::smatch match;
+ while (getline(ifs, line)) {
+ if (std::regex_search(line, match, kContextLine)) {
+ isDesiredContext = match.str(1) == contextName;
+ continue;
+ }
+ if (!isDesiredContext) {
+ continue;
+ }
+ eachLine(line);
+ }
+ return OK;
+}
+
+status_t getBinderPidInfo(BinderDebugContext context, pid_t pid, BinderPidInfo* pidInfo) {
+ std::smatch match;
+ static const std::regex kReferencePrefix("^\\s*node \\d+:\\s+u([0-9a-f]+)\\s+c([0-9a-f]+)\\s+");
+ static const std::regex kThreadPrefix("^\\s*thread \\d+:\\s+l\\s+(\\d)(\\d)");
+ std::string contextStr = contextToString(context);
+ status_t ret = scanBinderContext(pid, contextStr, [&](const std::string& line) {
+ if (std::regex_search(line, match, kReferencePrefix)) {
+ const std::string& ptrString = "0x" + match.str(2); // use number after c
+ uint64_t ptr;
+ if (!::android::base::ParseUint(ptrString.c_str(), &ptr)) {
+ // Should not reach here, but just be tolerant.
+ return;
+ }
+ const std::string proc = " proc ";
+ auto pos = line.rfind(proc);
+ if (pos != std::string::npos) {
+ for (const std::string& pidStr : base::Split(line.substr(pos + proc.size()), " ")) {
+ int32_t pid;
+ if (!::android::base::ParseInt(pidStr, &pid)) {
+ return;
+ }
+ pidInfo->refPids[ptr].push_back(pid);
+ }
+ }
+
+ return;
+ }
+ if (std::regex_search(line, match, kThreadPrefix)) {
+ // "1" is waiting in binder driver
+ // "2" is poll. It's impossible to tell if these are in use.
+ // and HIDL default code doesn't use it.
+ bool isInUse = match.str(1) != "1";
+ // "0" is a thread that has called into binder
+ // "1" is looper thread
+ // "2" is main looper thread
+ bool isBinderThread = match.str(2) != "0";
+ if (!isBinderThread) {
+ return;
+ }
+ if (isInUse) {
+ pidInfo->threadUsage++;
+ }
+
+ pidInfo->threadCount++;
+ return;
+ }
+ return;
+ });
+ return ret;
+}
+
+} // namespace android
diff --git a/libs/binderdebug/TEST_MAPPING b/libs/binderdebug/TEST_MAPPING
new file mode 100644
index 0000000000..2f3353e871
--- /dev/null
+++ b/libs/binderdebug/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+ "presubmit": [
+ {
+ "name": "libbinderdebug_test"
+ }
+ ]
+}
diff --git a/libs/binderdebug/include/binderdebug/BinderDebug.h b/libs/binderdebug/include/binderdebug/BinderDebug.h
new file mode 100644
index 0000000000..14a0ef3672
--- /dev/null
+++ b/libs/binderdebug/include/binderdebug/BinderDebug.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+#pragma once
+
+#include <map>
+#include <vector>
+
+namespace android {
+
+struct BinderPidInfo {
+ std::map<uint64_t, std::vector<pid_t>> refPids; // cookie -> processes which hold binder
+ uint32_t threadUsage; // number of threads in use
+ uint32_t threadCount; // number of threads total
+};
+
+enum class BinderDebugContext {
+ BINDER,
+ HWBINDER,
+ VNDBINDER,
+};
+
+status_t getBinderPidInfo(BinderDebugContext context, pid_t pid, BinderPidInfo* pidInfo);
+
+} // namespace android
diff --git a/libs/binderdebug/tests/Android.bp b/libs/binderdebug/tests/Android.bp
new file mode 100644
index 0000000000..4c06b1d0d9
--- /dev/null
+++ b/libs/binderdebug/tests/Android.bp
@@ -0,0 +1,30 @@
+// Copyright (C) 2020 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.
+
+cc_test {
+ name: "libbinderdebug_test",
+ test_suites: ["general-tests"],
+ srcs: [
+ "binderdebug_test.cpp",
+ "android/binderdebug/test/IControl.aidl",
+ ],
+ shared_libs: [
+ "libbase",
+ "libbinder",
+ "libutils",
+ ],
+ static_libs: ["libbinderdebug"],
+ cflags: ["-Wall", "-Werror"],
+ require_root: true,
+}
diff --git a/libs/binderdebug/tests/android/binderdebug/test/IControl.aidl b/libs/binderdebug/tests/android/binderdebug/test/IControl.aidl
new file mode 100644
index 0000000000..8efeb6352f
--- /dev/null
+++ b/libs/binderdebug/tests/android/binderdebug/test/IControl.aidl
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+package android.binderdebug.test;
+
+interface IControl {
+ // Notifies the service to continue execution
+ void Continue();
+}
diff --git a/libs/binderdebug/tests/binderdebug_test.cpp b/libs/binderdebug/tests/binderdebug_test.cpp
new file mode 100644
index 0000000000..ea799c06a2
--- /dev/null
+++ b/libs/binderdebug/tests/binderdebug_test.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include <binder/Binder.h>
+#include <binder/IServiceManager.h>
+#include <binder/ProcessState.h>
+#include <binder/IPCThreadState.h>
+#include <binderdebug/BinderDebug.h>
+#include <gtest/gtest.h>
+#include <semaphore.h>
+#include <thread>
+
+#include <android/binderdebug/test/BnControl.h>
+#include <android/binderdebug/test/IControl.h>
+
+namespace android {
+namespace binderdebug {
+namespace test {
+
+class Control : public BnControl {
+public:
+ Control() {sem_init(&s, 1, 0);};
+ ::android::binder::Status Continue() override;
+ sem_t s;
+};
+
+::android::binder::Status Control::Continue() {
+ IPCThreadState::self()->flushCommands();
+ sem_post(&s);
+ return binder::Status::ok();
+}
+
+TEST(BinderDebugTests, BinderPid) {
+ BinderPidInfo pidInfo;
+ const auto& status = getBinderPidInfo(BinderDebugContext::BINDER, getpid(), &pidInfo);
+ ASSERT_EQ(status, OK);
+ // There should be one referenced PID for servicemanager
+ EXPECT_TRUE(!pidInfo.refPids.empty());
+}
+
+TEST(BinderDebugTests, BinderThreads) {
+ BinderPidInfo pidInfo;
+ const auto& status = getBinderPidInfo(BinderDebugContext::BINDER, getpid(), &pidInfo);
+ ASSERT_EQ(status, OK);
+ EXPECT_TRUE(pidInfo.threadUsage <= pidInfo.threadCount);
+ // The second looper thread can sometimes take longer to spawn.
+ EXPECT_GE(pidInfo.threadCount, 1);
+}
+
+extern "C" {
+int main(int argc, char** argv) {
+ ::testing::InitGoogleTest(&argc, argv);
+
+ // Create a child/client process to call into the main process so we can ensure
+ // looper thread has been registered before attempting to get the BinderPidInfo
+ pid_t pid = fork();
+ if (pid == 0) {
+ sp<IBinder> binder = android::defaultServiceManager()->getService(String16("binderdebug"));
+ sp<IControl> service;
+ if (binder != nullptr) {
+ service = android::interface_cast<IControl>(binder);
+ }
+ service->Continue();
+ exit(0);
+ }
+ sp<Control> iface = new Control;
+ android::defaultServiceManager()->addService(String16("binderdebug"), iface);
+ android::ProcessState::self()->setThreadPoolMaxThreadCount(8);
+ ProcessState::self()->startThreadPool();
+ sem_wait(&iface->s);
+
+ return RUN_ALL_TESTS();
+}
+} // extern "C"
+} // namespace test
+} // namespace binderdebug
+} // namespace android
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2026-01-07 12:20:55 +0000