| /* |
| * Copyright (C) 2010 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 <private/gui/BitTube.h> |
| |
| #include <stdint.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include <utils/Errors.h> |
| |
| #include <binder/Parcel.h> |
| |
| namespace android { |
| namespace gui { |
| |
| // Socket buffer size. The default is typically about 128KB, which is much larger than we really |
| // need. So we make it smaller. |
| static const size_t DEFAULT_SOCKET_BUFFER_SIZE = 4 * 1024; |
| |
| BitTube::BitTube(size_t bufsize) { |
| init(bufsize, bufsize); |
| } |
| |
| BitTube::BitTube(DefaultSizeType) : BitTube(DEFAULT_SOCKET_BUFFER_SIZE) {} |
| |
| BitTube::BitTube(const Parcel& data) { |
| readFromParcel(&data); |
| } |
| |
| void BitTube::init(size_t rcvbuf, size_t sndbuf) { |
| int sockets[2]; |
| if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets) == 0) { |
| size_t size = DEFAULT_SOCKET_BUFFER_SIZE; |
| setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)); |
| setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)); |
| // since we don't use the "return channel", we keep it small... |
| setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)); |
| setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); |
| fcntl(sockets[0], F_SETFL, O_NONBLOCK); |
| fcntl(sockets[1], F_SETFL, O_NONBLOCK); |
| mReceiveFd.reset(sockets[0]); |
| mSendFd.reset(sockets[1]); |
| } else { |
| mReceiveFd.reset(); |
| ALOGE("BitTube: pipe creation failed (%s)", strerror(errno)); |
| } |
| } |
| |
| status_t BitTube::initCheck() const { |
| if (mReceiveFd < 0) { |
| return status_t(mReceiveFd); |
| } |
| return NO_ERROR; |
| } |
| |
| int BitTube::getFd() const { |
| return mReceiveFd; |
| } |
| |
| int BitTube::getSendFd() const { |
| return mSendFd; |
| } |
| |
| base::unique_fd BitTube::moveReceiveFd() { |
| return std::move(mReceiveFd); |
| } |
| |
| void BitTube::setReceiveFd(base::unique_fd&& receiveFd) { |
| mReceiveFd = std::move(receiveFd); |
| } |
| |
| ssize_t BitTube::write(void const* vaddr, size_t size) { |
| ssize_t err, len; |
| do { |
| len = ::send(mSendFd, vaddr, size, MSG_DONTWAIT | MSG_NOSIGNAL); |
| // cannot return less than size, since we're using SOCK_SEQPACKET |
| err = len < 0 ? errno : 0; |
| } while (err == EINTR); |
| return err == 0 ? len : -err; |
| } |
| |
| ssize_t BitTube::read(void* vaddr, size_t size) { |
| ssize_t err, len; |
| do { |
| len = ::recv(mReceiveFd, vaddr, size, MSG_DONTWAIT); |
| err = len < 0 ? errno : 0; |
| } while (err == EINTR); |
| if (err == EAGAIN || err == EWOULDBLOCK) { |
| // EAGAIN means that we have non-blocking I/O but there was no data to be read. Nothing the |
| // client should care about. |
| return 0; |
| } |
| return err == 0 ? len : -err; |
| } |
| |
| status_t BitTube::writeToParcel(Parcel* reply) const { |
| if (mReceiveFd < 0) return -EINVAL; |
| |
| status_t result = reply->writeDupFileDescriptor(mReceiveFd); |
| mReceiveFd.reset(); |
| return result; |
| } |
| |
| status_t BitTube::readFromParcel(const Parcel* parcel) { |
| mReceiveFd.reset(dup(parcel->readFileDescriptor())); |
| if (mReceiveFd < 0) { |
| mReceiveFd.reset(); |
| int error = errno; |
| ALOGE("BitTube::readFromParcel: can't dup file descriptor (%s)", strerror(error)); |
| return -error; |
| } |
| return NO_ERROR; |
| } |
| |
| ssize_t BitTube::sendObjects(BitTube* tube, void const* events, size_t count, size_t objSize) { |
| const char* vaddr = reinterpret_cast<const char*>(events); |
| ssize_t size = tube->write(vaddr, count * objSize); |
| |
| // should never happen because of SOCK_SEQPACKET |
| LOG_ALWAYS_FATAL_IF((size >= 0) && (size % static_cast<ssize_t>(objSize)), |
| "BitTube::sendObjects(count=%zu, size=%zu), res=%zd (partial events were " |
| "sent!)", |
| count, objSize, size); |
| |
| // ALOGE_IF(size<0, "error %d sending %d events", size, count); |
| return size < 0 ? size : size / static_cast<ssize_t>(objSize); |
| } |
| |
| ssize_t BitTube::recvObjects(BitTube* tube, void* events, size_t count, size_t objSize) { |
| char* vaddr = reinterpret_cast<char*>(events); |
| ssize_t size = tube->read(vaddr, count * objSize); |
| |
| // should never happen because of SOCK_SEQPACKET |
| LOG_ALWAYS_FATAL_IF((size >= 0) && (size % static_cast<ssize_t>(objSize)), |
| "BitTube::recvObjects(count=%zu, size=%zu), res=%zd (partial events were " |
| "received!)", |
| count, objSize, size); |
| |
| // ALOGE_IF(size<0, "error %d receiving %d events", size, count); |
| return size < 0 ? size : size / static_cast<ssize_t>(objSize); |
| } |
| |
| } // namespace gui |
| } // namespace android |