Merge changes from topic "binder_rpc_non_blocking" am: 93b2cc9617 (bd3eee40) · Commits · e / os / android_frameworks_native-old

libs/binder/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -104,6 +104,7 @@ cc_library {
		"BpBinder.cpp",
		"BufferedTextOutput.cpp",
		"Debug.cpp",
		"FdTrigger.cpp",
		"IInterface.cpp",
		"IMemory.cpp",
		"IPCThreadState.cpp",

libs/binder/FdTrigger.cpp

0 → 100644

+62 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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.
		*/

		#define LOG_TAG "FdTrigger"
		#include <log/log.h>

		#include <poll.h>

		#include <android-base/macros.h>

		#include "FdTrigger.h"
		namespace android {

		std::unique_ptr<FdTrigger> FdTrigger::make() {
		auto ret = std::make_unique<FdTrigger>();
		if (!android::base::Pipe(&ret->mRead, &ret->mWrite)) {
		ALOGE("Could not create pipe %s", strerror(errno));
		return nullptr;
		}
		return ret;
		}

		void FdTrigger::trigger() {
		mWrite.reset();
		}

		bool FdTrigger::isTriggered() {
		return mWrite == -1;
		}

		status_t FdTrigger::triggerablePoll(base::borrowed_fd fd, int16_t event) {
		while (true) {
		pollfd pfd[]{{.fd = fd.get(), .events = static_cast<int16_t>(event), .revents = 0},
		{.fd = mRead.get(), .events = POLLHUP, .revents = 0}};
		int ret = TEMP_FAILURE_RETRY(poll(pfd, arraysize(pfd), -1));
		if (ret < 0) {
		return -errno;
		}
		if (ret == 0) {
		continue;
		}
		if (pfd[1].revents & POLLHUP) {
		return -ECANCELED;
		}
		return pfd[0].revents & event ? OK : DEAD_OBJECT;
		}
		}

		} // namespace android

libs/binder/FdTrigger.h

0 → 100644

+56 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2021 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 <memory>

		#include <android-base/unique_fd.h>
		#include <utils/Errors.h>

		namespace android {

		/** This is not a pipe. */
		class FdTrigger {
		public:
		/** Returns nullptr for error case */
		static std::unique_ptr<FdTrigger> make();

		/**
		* Close the write end of the pipe so that the read end receives POLLHUP.
		* Not threadsafe.
		*/
		void trigger();

		/**
		* Whether this has been triggered.
		*/
		bool isTriggered();

		/**
		* Poll for a read event.
		*
		* event - for pollfd
		*
		* Return:
		* true - time to read!
		* false - trigger happened
		*/
		status_t triggerablePoll(base::borrowed_fd fd, int16_t event);

		private:
		base::unique_fd mWrite;
		base::unique_fd mRead;
		};
		} // namespace android

libs/binder/RpcServer.cpp

+10 −9

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@
		#include <binder/RpcTransportRaw.h>
		#include <log/log.h>

		#include "FdTrigger.h"
		#include "RpcSocketAddress.h"
		#include "RpcState.h"
		#include "RpcWireFormat.h"
		@@ -156,7 +157,7 @@ void RpcServer::join() {
		LOG_ALWAYS_FATAL_IF(!mServer.ok(), "RpcServer must be setup to join.");
		LOG_ALWAYS_FATAL_IF(mShutdownTrigger != nullptr, "Already joined");
		mJoinThreadRunning = true;
		mShutdownTrigger = RpcSession::FdTrigger::make();
		mShutdownTrigger = FdTrigger::make();
		LOG_ALWAYS_FATAL_IF(mShutdownTrigger == nullptr, "Cannot create join signaler");

		mCtx = mRpcTransportCtxFactory->newServerCtx();
		@@ -167,7 +168,7 @@ void RpcServer::join() {
		status_t status;
		while ((status = mShutdownTrigger->triggerablePoll(mServer, POLLIN)) == OK) {
		unique_fd clientFd(TEMP_FAILURE_RETRY(
		accept4(mServer.get(), nullptr, nullptr /length/, SOCK_CLOEXEC)));
		accept4(mServer.get(), nullptr, nullptr /length/, SOCK_CLOEXEC \| SOCK_NONBLOCK)));

		if (clientFd < 0) {
		ALOGE("Could not accept4 socket: %s", strerror(errno));
		@@ -259,7 +260,7 @@ void RpcServer::establishConnection(sp<RpcServer>&& server, base::unique_fd clie
		status_t status = OK;

		int clientFdForLog = clientFd.get();
		auto client = server->mCtx->newTransport(std::move(clientFd));
		auto client = server->mCtx->newTransport(std::move(clientFd), server->mShutdownTrigger.get());
		if (client == nullptr) {
		ALOGE("Dropping accept4()-ed socket because sslAccept fails");
		status = DEAD_OBJECT;
		@@ -270,7 +271,7 @@ void RpcServer::establishConnection(sp<RpcServer>&& server, base::unique_fd clie

		RpcConnectionHeader header;
		if (status == OK) {
		status = server->mShutdownTrigger->interruptableReadFully(client.get(), &header,
		status = client->interruptableReadFully(server->mShutdownTrigger.get(), &header,
		sizeof(header));
		if (status != OK) {
		ALOGE("Failed to read ID for client connecting to RPC server: %s",
		@@ -296,7 +297,7 @@ void RpcServer::establishConnection(sp<RpcServer>&& server, base::unique_fd clie
		.version = protocolVersion,
		};

		status = server->mShutdownTrigger->interruptableWriteFully(client.get(), &response,
		status = client->interruptableWriteFully(server->mShutdownTrigger.get(), &response,
		sizeof(response));
		if (status != OK) {
		ALOGE("Failed to send new session response: %s", statusToString(status).c_str());
		@@ -387,8 +388,8 @@ status_t RpcServer::setupSocketServer(const RpcSocketAddress& addr) {
		LOG_RPC_DETAIL("Setting up socket server %s", addr.toString().c_str());
		LOG_ALWAYS_FATAL_IF(hasServer(), "Each RpcServer can only have one server.");

		unique_fd serverFd(
		TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC, 0)));
		unique_fd serverFd(TEMP_FAILURE_RETRY(
		socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK, 0)));
		if (serverFd == -1) {
		int savedErrno = errno;
		ALOGE("Could not create socket: %s", strerror(savedErrno));

libs/binder/RpcSession.cpp

+58 −111

Original line number	Diff line number	Diff line
		@@ -35,9 +35,11 @@
		#include <jni.h>
		#include <utils/String8.h>

		#include "FdTrigger.h"
		#include "RpcSocketAddress.h"
		#include "RpcState.h"
		#include "RpcWireFormat.h"
		#include "Utils.h"

		#ifdef __GLIBC__
		extern "C" pid_t gettid();
		@@ -133,12 +135,18 @@ status_t RpcSession::setupPreconnectedClient(unique_fd fd, std::function<unique_
		fd = request();
		if (!fd.ok()) return BAD_VALUE;
		}
		if (auto res = setNonBlocking(fd); !res.ok()) {
		ALOGE("setupPreconnectedClient: %s", res.error().message().c_str());
		return res.error().code() == 0 ? UNKNOWN_ERROR : -res.error().code();
		}
		return initAndAddConnection(std::move(fd), sessionId, incoming);
		});
		}

		status_t RpcSession::addNullDebuggingClient() {
		// Note: only works on raw sockets.
		if (auto status = initShutdownTrigger(); status != OK) return status;

		unique_fd serverFd(TEMP_FAILURE_RETRY(open("/dev/null", O_WRONLY \| O_CLOEXEC)));

		if (serverFd == -1) {
		@@ -152,7 +160,7 @@ status_t RpcSession::addNullDebuggingClient() {
		ALOGE("Unable to create RpcTransportCtx for null debugging client");
		return NO_MEMORY;
		}
		auto server = ctx->newTransport(std::move(serverFd));
		auto server = ctx->newTransport(std::move(serverFd), mShutdownTrigger.get());
		if (server == nullptr) {
		ALOGE("Unable to set up RpcTransport");
		return UNKNOWN_ERROR;
		@@ -216,91 +224,6 @@ status_t RpcSession::sendDecStrong(const RpcAddress& address) {
		return state()->sendDecStrong(connection.get(), sp<RpcSession>::fromExisting(this), address);
		}

		std::unique_ptr<RpcSession::FdTrigger> RpcSession::FdTrigger::make() {
		auto ret = std::make_unique<RpcSession::FdTrigger>();
		if (!android::base::Pipe(&ret->mRead, &ret->mWrite)) {
		ALOGE("Could not create pipe %s", strerror(errno));
		return nullptr;
		}
		return ret;
		}

		void RpcSession::FdTrigger::trigger() {
		mWrite.reset();
		}

		bool RpcSession::FdTrigger::isTriggered() {
		return mWrite == -1;
		}

		status_t RpcSession::FdTrigger::triggerablePoll(RpcTransport* rpcTransport, int16_t event) {
		return triggerablePoll(rpcTransport->pollSocket(), event);
		}

		status_t RpcSession::FdTrigger::triggerablePoll(base::borrowed_fd fd, int16_t event) {
		while (true) {
		pollfd pfd[]{{.fd = fd.get(), .events = static_cast<int16_t>(event), .revents = 0},
		{.fd = mRead.get(), .events = POLLHUP, .revents = 0}};
		int ret = TEMP_FAILURE_RETRY(poll(pfd, arraysize(pfd), -1));
		if (ret < 0) {
		return -errno;
		}
		if (ret == 0) {
		continue;
		}
		if (pfd[1].revents & POLLHUP) {
		return -ECANCELED;
		}
		return pfd[0].revents & event ? OK : DEAD_OBJECT;
		}
		}

		status_t RpcSession::FdTrigger::interruptableWriteFully(RpcTransport* rpcTransport,
		const void* data, size_t size) {
		const uint8_t* buffer = reinterpret_cast<const uint8_t*>(data);
		const uint8_t* end = buffer + size;

		MAYBE_WAIT_IN_FLAKE_MODE;

		status_t status;
		while ((status = triggerablePoll(rpcTransport, POLLOUT)) == OK) {
		auto writeSize = rpcTransport->send(buffer, end - buffer);
		if (!writeSize.ok()) {
		LOG_RPC_DETAIL("RpcTransport::send(): %s", writeSize.error().message().c_str());
		return writeSize.error().code() == 0 ? UNKNOWN_ERROR : -writeSize.error().code();
		}

		if (*writeSize == 0) return DEAD_OBJECT;

		buffer += *writeSize;
		if (buffer == end) return OK;
		}
		return status;
		}

		status_t RpcSession::FdTrigger::interruptableReadFully(RpcTransport* rpcTransport, void* data,
		size_t size) {
		uint8_t* buffer = reinterpret_cast<uint8_t*>(data);
		uint8_t* end = buffer + size;

		MAYBE_WAIT_IN_FLAKE_MODE;

		status_t status;
		while ((status = triggerablePoll(rpcTransport, POLLIN)) == OK) {
		auto readSize = rpcTransport->recv(buffer, end - buffer);
		if (!readSize.ok()) {
		LOG_RPC_DETAIL("RpcTransport::recv(): %s", readSize.error().message().c_str());
		return readSize.error().code() == 0 ? UNKNOWN_ERROR : -readSize.error().code();
		}

		if (*readSize == 0) return DEAD_OBJECT; // EOF

		buffer += *readSize;
		if (buffer == end) return OK;
		}
		return status;
		}

		status_t RpcSession::readId() {
		{
		std::lock_guard<std::mutex> _l(mMutex);
		@@ -484,6 +407,7 @@ status_t RpcSession::setupClient(
		"Must only setup session once, but already has %zu clients",
		mOutgoingConnections.size());
		}
		if (auto status = initShutdownTrigger(); status != OK) return status;

		if (status_t status = connectAndInit(RpcAddress::zero(), false /incoming/); status != OK)
		return status;
		@@ -550,8 +474,8 @@ status_t RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr,
		for (size_t tries = 0; tries < 5; tries++) {
		if (tries > 0) usleep(10000);

		unique_fd serverFd(
		TEMP_FAILURE_RETRY(socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC, 0)));
		unique_fd serverFd(TEMP_FAILURE_RETRY(
		socket(addr.addr()->sa_family, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK, 0)));
		if (serverFd == -1) {
		int savedErrno = errno;
		ALOGE("Could not create socket at %s: %s", addr.toString().c_str(),
		@@ -564,11 +488,35 @@ status_t RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr,
		ALOGW("Connection reset on %s", addr.toString().c_str());
		continue;
		}
		if (errno != EAGAIN && errno != EINPROGRESS) {
		int savedErrno = errno;
		ALOGE("Could not connect socket at %s: %s", addr.toString().c_str(),
		strerror(savedErrno));
		return -savedErrno;
		}
		// For non-blocking sockets, connect() may return EAGAIN (for unix domain socket) or
		// EINPROGRESS (for others). Call poll() and getsockopt() to get the error.
		status_t pollStatus = mShutdownTrigger->triggerablePoll(serverFd, POLLOUT);
		if (pollStatus != OK) {
		ALOGE("Could not POLLOUT after connect() on non-blocking socket: %s",
		statusToString(pollStatus).c_str());
		return pollStatus;
		}
		int soError;
		socklen_t soErrorLen = sizeof(soError);
		int ret = getsockopt(serverFd.get(), SOL_SOCKET, SO_ERROR, &soError, &soErrorLen);
		if (ret == -1) {
		int savedErrno = errno;
		ALOGE("Could not getsockopt() after connect() on non-blocking socket: %s",
		strerror(savedErrno));
		return -savedErrno;
		}
		if (soError != 0) {
		ALOGE("After connect(), getsockopt() returns error for socket at %s: %s",
		addr.toString().c_str(), strerror(soError));
		return -soError;
		}
		}
		LOG_RPC_DETAIL("Socket at %s client with fd %d", addr.toString().c_str(), serverFd.get());

		return initAndAddConnection(std::move(serverFd), sessionId, incoming);
		@@ -580,13 +528,14 @@ status_t RpcSession::setupOneSocketConnection(const RpcSocketAddress& addr,

		status_t RpcSession::initAndAddConnection(unique_fd fd, const RpcAddress& sessionId,
		bool incoming) {
		LOG_ALWAYS_FATAL_IF(mShutdownTrigger == nullptr);
		auto ctx = mRpcTransportCtxFactory->newClientCtx();
		if (ctx == nullptr) {
		ALOGE("Unable to create client RpcTransportCtx with %s sockets",
		mRpcTransportCtxFactory->toCString());
		return NO_MEMORY;
		}
		auto server = ctx->newTransport(std::move(fd));
		auto server = ctx->newTransport(std::move(fd), mShutdownTrigger.get());
		if (server == nullptr) {
		ALOGE("Unable to set up RpcTransport in %s context", mRpcTransportCtxFactory->toCString());
		return UNKNOWN_ERROR;
		@@ -602,16 +551,12 @@ status_t RpcSession::initAndAddConnection(unique_fd fd, const RpcAddress& sessio

		if (incoming) header.options \|= RPC_CONNECTION_OPTION_INCOMING;

		auto sentHeader = server->send(&header, sizeof(header));
		if (!sentHeader.ok()) {
		auto sendHeaderStatus =
		server->interruptableWriteFully(mShutdownTrigger.get(), &header, sizeof(header));
		if (sendHeaderStatus != OK) {
		ALOGE("Could not write connection header to socket: %s",
		sentHeader.error().message().c_str());
		return -sentHeader.error().code();
		}
		if (*sentHeader != sizeof(header)) {
		ALOGE("Could not write connection header to socket: sent %zd bytes, expected %zd",
		*sentHeader, sizeof(header));
		return UNKNOWN_ERROR;
		statusToString(sendHeaderStatus).c_str());
		return sendHeaderStatus;
		}

		LOG_RPC_DETAIL("Socket at client: header sent");
		@@ -652,11 +597,7 @@ status_t RpcSession::addIncomingConnection(std::unique_ptr<RpcTransport> rpcTran
		return OK;
		}

		status_t RpcSession::addOutgoingConnection(std::unique_ptr<RpcTransport> rpcTransport, bool init) {
		sp<RpcConnection> connection = sp<RpcConnection>::make();
		{
		std::lock_guard<std::mutex> _l(mMutex);

		status_t RpcSession::initShutdownTrigger() {
		// first client connection added, but setForServer not called, so
		// initializaing for a client.
		if (mShutdownTrigger == nullptr) {
		@@ -664,7 +605,13 @@ status_t RpcSession::addOutgoingConnection(std::unique_ptr<RpcTransport> rpcTran
		mEventListener = mShutdownListener = sp<WaitForShutdownListener>::make();
		if (mShutdownTrigger == nullptr) return INVALID_OPERATION;
		}
		return OK;
		}

		status_t RpcSession::addOutgoingConnection(std::unique_ptr<RpcTransport> rpcTransport, bool init) {
		sp<RpcConnection> connection = sp<RpcConnection>::make();
		{
		std::lock_guard<std::mutex> _l(mMutex);
		connection->rpcTransport = std::move(rpcTransport);
		connection->exclusiveTid = gettid();
		mOutgoingConnections.push_back(connection);