124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <unistd.h>
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#include <utils/Errors.h>
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#include <binder/Parcel.h>
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#include <gui/BitTube.h>
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namespace android {
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// ----------------------------------------------------------------------------
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BitTube::BitTube()
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: mSendFd(-1), mReceiveFd(-1)
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{
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int fds[2];
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if (pipe(fds) == 0) {
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mReceiveFd = fds[0];
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mSendFd = fds[1];
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fcntl(mReceiveFd, F_SETFL, O_NONBLOCK);
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fcntl(mSendFd, F_SETFL, O_NONBLOCK);
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// ignore SIGPIPE, we handle write errors through EPIPE instead
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signal(SIGPIPE, SIG_IGN);
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} else {
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mReceiveFd = -errno;
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ALOGE("BitTube: pipe creation failed (%s)", strerror(-mReceiveFd));
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}
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}
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BitTube::BitTube(const Parcel& data)
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: mSendFd(-1), mReceiveFd(-1)
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{
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mReceiveFd = dup(data.readFileDescriptor());
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if (mReceiveFd >= 0) {
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fcntl(mReceiveFd, F_SETFL, O_NONBLOCK);
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} else {
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mReceiveFd = -errno;
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ALOGE("BitTube(Parcel): can't dup filedescriptor (%s)",
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strerror(-mReceiveFd));
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}
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}
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BitTube::~BitTube()
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{
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if (mSendFd >= 0)
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close(mSendFd);
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if (mReceiveFd >= 0)
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close(mReceiveFd);
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}
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status_t BitTube::initCheck() const
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{
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if (mReceiveFd < 0) {
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return status_t(mReceiveFd);
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}
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return NO_ERROR;
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}
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int BitTube::getFd() const
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{
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return mReceiveFd;
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}
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ssize_t BitTube::write(void const* vaddr, size_t size)
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{
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ssize_t err, len;
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do {
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len = ::write(mSendFd, vaddr, size);
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err = len < 0 ? errno : 0;
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} while (err == EINTR);
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return err == 0 ? len : -err;
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}
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ssize_t BitTube::read(void* vaddr, size_t size)
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{
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ssize_t err, len;
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do {
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len = ::read(mReceiveFd, vaddr, size);
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err = len < 0 ? errno : 0;
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} while (err == EINTR);
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if (err == EAGAIN || err == EWOULDBLOCK) {
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// EAGAIN means that we have non-blocking I/O but there was
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// no data to be read. Nothing the client should care about.
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return 0;
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}
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return err == 0 ? len : -err;
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}
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status_t BitTube::writeToParcel(Parcel* reply) const
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{
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if (mReceiveFd < 0)
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return -EINVAL;
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status_t result = reply->writeDupFileDescriptor(mReceiveFd);
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close(mReceiveFd);
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mReceiveFd = -1;
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return result;
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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