| /* |
| * 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 <unistd.h> |
| #include <fcntl.h> |
| |
| #include <utils/Errors.h> |
| |
| #include <binder/Parcel.h> |
| |
| #include <gui/BitTube.h> |
| |
| namespace android { |
| // ---------------------------------------------------------------------------- |
| |
| BitTube::BitTube() |
| : mSendFd(-1), mReceiveFd(-1) |
| { |
| int fds[2]; |
| if (pipe(fds) == 0) { |
| mReceiveFd = fds[0]; |
| mSendFd = fds[1]; |
| fcntl(mReceiveFd, F_SETFL, O_NONBLOCK); |
| fcntl(mSendFd, F_SETFL, O_NONBLOCK); |
| } else { |
| mReceiveFd = -errno; |
| LOGE("BitTube: pipe creation failed (%s)", strerror(-mReceiveFd)); |
| } |
| } |
| |
| BitTube::BitTube(const Parcel& data) |
| : mSendFd(-1), mReceiveFd(-1) |
| { |
| mReceiveFd = dup(data.readFileDescriptor()); |
| if (mReceiveFd >= 0) { |
| fcntl(mReceiveFd, F_SETFL, O_NONBLOCK); |
| } else { |
| mReceiveFd = -errno; |
| LOGE("BitTube(Parcel): can't dup filedescriptor (%s)", |
| strerror(-mReceiveFd)); |
| } |
| } |
| |
| BitTube::~BitTube() |
| { |
| if (mSendFd >= 0) |
| close(mSendFd); |
| |
| if (mReceiveFd >= 0) |
| close(mReceiveFd); |
| } |
| |
| status_t BitTube::initCheck() const |
| { |
| if (mReceiveFd < 0) { |
| return status_t(mReceiveFd); |
| } |
| return NO_ERROR; |
| } |
| |
| int BitTube::getFd() const |
| { |
| return mReceiveFd; |
| } |
| |
| ssize_t BitTube::write(void const* vaddr, size_t size) |
| { |
| ssize_t err, len; |
| do { |
| len = ::write(mSendFd, vaddr, size); |
| 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 = ::read(mReceiveFd, vaddr, size); |
| 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; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| }; // namespace android |