1//
2// Copyright (C) 2014 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "shill/net/io_ready_handler.h"
18
19#include <unistd.h>
20
21#include <base/logging.h>
22
23namespace shill {
24
25IOReadyHandler::IOReadyHandler(int fd,
26                               ReadyMode mode,
27                               const ReadyCallback& ready_callback)
28    : fd_(fd),
29      ready_mode_(mode),
30      ready_callback_(ready_callback) {}
31
32IOReadyHandler::~IOReadyHandler() {
33  Stop();
34}
35
36void IOReadyHandler::Start() {
37  CHECK(ready_mode_ == kModeOutput || ready_mode_ == kModeInput);
38  base::MessageLoopForIO::Mode mode;
39  if (ready_mode_ == kModeOutput) {
40    mode = base::MessageLoopForIO::WATCH_WRITE;
41  } else {
42    mode = base::MessageLoopForIO::WATCH_READ;
43  }
44
45  if (!base::MessageLoopForIO::current()->WatchFileDescriptor(
46          fd_, true, mode, &fd_watcher_, this)) {
47    LOG(ERROR) << "WatchFileDescriptor failed on read";
48  }
49}
50
51void IOReadyHandler::Stop() {
52  fd_watcher_.StopWatchingFileDescriptor();
53}
54
55void IOReadyHandler::OnFileCanReadWithoutBlocking(int fd) {
56  CHECK_EQ(fd_, fd);
57  CHECK_EQ(ready_mode_, kModeInput);
58
59  ready_callback_.Run(fd_);
60}
61
62void IOReadyHandler::OnFileCanWriteWithoutBlocking(int fd) {
63  CHECK_EQ(fd_, fd);
64  CHECK_EQ(ready_mode_, kModeOutput);
65
66  ready_callback_.Run(fd_);
67}
68
69}  // namespace shill
70