| /* |
| * 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 <stdint.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| |
| #include <utils/Errors.h> |
| |
| #include <binder/Parcel.h> |
| |
| #include <gui/BitTube.h> |
| |
| namespace android { |
| // ---------------------------------------------------------------------------- |
| |
| // 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() |
| : mSendFd(-1), mReceiveFd(-1) |
| { |
| init(DEFAULT_SOCKET_BUFFER_SIZE, DEFAULT_SOCKET_BUFFER_SIZE); |
| } |
| |
| BitTube::BitTube(size_t bufsize) |
| : mSendFd(-1), mReceiveFd(-1) |
| { |
| init(bufsize, bufsize); |
| } |
| |
| BitTube::BitTube(const Parcel& data) |
| : mSendFd(-1), mReceiveFd(-1) |
| { |
| mReceiveFd = dup(data.readFileDescriptor()); |
| if (mReceiveFd < 0) { |
| mReceiveFd = -errno; |
| ALOGE("BitTube(Parcel): can't dup filedescriptor (%s)", |
| strerror(-mReceiveFd)); |
| } |
| } |
| |
| BitTube::~BitTube() |
| { |
| if (mSendFd >= 0) |
| close(mSendFd); |
| |
| if (mReceiveFd >= 0) |
| close(mReceiveFd); |
| } |
| |
| 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)); |
| // sine 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 = sockets[0]; |
| mSendFd = sockets[1]; |
| } else { |
| mReceiveFd = -errno; |
| ALOGE("BitTube: pipe creation failed (%s)", strerror(-mReceiveFd)); |
| } |
| } |
| |
| 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; |
| } |
| |
| 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); |
| close(mReceiveFd); |
| mReceiveFd = -1; |
| return result; |
| } |
| |
| |
| ssize_t BitTube::sendObjects(const sp<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(const sp<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 android |