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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/test/chromedriver/net/pipe_reader_posix.h"
#include <errno.h>
#include <memory>
#include <utility>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/task/current_thread.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#if BUILDFLAG(IS_FUCHSIA)
#include <poll.h>
#include <sys/ioctl.h>
#endif // BUILDFLAG(IS_FUCHSIA)
PipeReaderPosix::PipeReaderPosix()
: fd_(base::kInvalidPlatformFile), read_fd_watcher_(FROM_HERE) {}
PipeReaderPosix::~PipeReaderPosix() {
Close();
}
int PipeReaderPosix::Bind(base::ScopedFD fd) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(!fd_.is_valid());
fd_ = std::move(fd);
if (!base::SetNonBlocking(fd_.get())) {
int rv = net::MapSystemError(errno);
Close();
return rv;
}
is_connected_ = true;
return net::OK;
}
bool PipeReaderPosix::IsConnected() const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
return is_connected_;
}
int PipeReaderPosix::Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) {
// Use base::Unretained() is safe here because OnFileCanReadWithoutBlocking()
// won't be called if |this| is gone.
int rv = ReadIfReady(
buf, buf_len,
base::BindOnce(&PipeReaderPosix::RetryRead, base::Unretained(this)));
if (rv == net::ERR_IO_PENDING) {
read_buf_ = buf;
read_buf_len_ = buf_len;
read_callback_ = std::move(callback);
}
is_connected_ = (rv == net::ERR_IO_PENDING) || (rv > 0);
return rv;
}
int PipeReaderPosix::ReadIfReady(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(fd_.is_valid());
CHECK(read_if_ready_callback_.is_null());
DCHECK(!callback.is_null());
DCHECK_LT(0, buf_len);
int rv = DoRead(buf, buf_len);
if (rv != net::ERR_IO_PENDING) {
return rv;
}
if (!base::CurrentIOThread::Get()->WatchFileDescriptor(
fd_.get(), true, base::MessagePumpForIO::WATCH_READ,
&read_fd_watcher_, this)) {
PLOG(ERROR) << "WatchFileDescriptor failed on read";
return net::MapSystemError(errno);
}
read_if_ready_callback_ = std::move(callback);
return net::ERR_IO_PENDING;
}
int PipeReaderPosix::CancelReadIfReady() {
DCHECK(read_if_ready_callback_);
bool ok = read_fd_watcher_.StopWatchingFileDescriptor();
DCHECK(ok);
read_if_ready_callback_.Reset();
return net::OK;
}
void PipeReaderPosix::Close() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
is_connected_ = false;
bool ok = read_fd_watcher_.StopWatchingFileDescriptor();
DCHECK(ok);
// These needs to be done after the StopWatchingFileDescriptor() calls, but
// before deleting the write buffer.
fd_.reset();
if (!read_callback_.is_null()) {
read_buf_.reset();
read_buf_len_ = 0;
read_callback_.Reset();
}
read_if_ready_callback_.Reset();
}
void PipeReaderPosix::DetachFromThread() {
DETACH_FROM_THREAD(thread_checker_);
}
void PipeReaderPosix::OnFileCanReadWithoutBlocking(int fd) {
DCHECK(read_if_ready_callback_);
bool ok = read_fd_watcher_.StopWatchingFileDescriptor();
DCHECK(ok);
std::move(read_if_ready_callback_).Run(net::OK);
}
void PipeReaderPosix::OnFileCanWriteWithoutBlocking(int fd) {}
int PipeReaderPosix::DoRead(net::IOBuffer* buf, int buf_len) {
int rv = HANDLE_EINTR(read(fd_.get(), buf->data(), buf_len));
if (rv == 0) {
return net::ERR_CONNECTION_CLOSED;
}
return rv > 0 ? rv : net::MapSystemError(errno);
}
void PipeReaderPosix::RetryRead(int rv) {
DCHECK(read_callback_);
DCHECK(read_buf_);
DCHECK_LT(0, read_buf_len_);
if (rv == net::OK) {
rv = ReadIfReady(
read_buf_.get(), read_buf_len_,
base::BindOnce(&PipeReaderPosix::RetryRead, base::Unretained(this)));
if (rv == net::ERR_IO_PENDING) {
return;
}
}
is_connected_ = (rv == net::ERR_IO_PENDING) || (rv > 0);
read_buf_ = nullptr;
read_buf_len_ = 0;
std::move(read_callback_).Run(rv);
}
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