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authorDaichi Hirono2017-03-06 00:21:00 -0600
committerDaichi Hirono2017-03-15 01:58:06 -0500
commit2a14b71f141fcb7924693cab41d62a8c1bb0f324 (patch)
tree09972c9f7572d5392fa719f23bf66537f846d731 /libappfuse/EpollController.cc
parente9af468cde8936ee4640092e0027ab76cecfda0a (diff)
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Add new EpollController class.
The class is a thin wrapper for C epoll functions. Bug: 34903085 Test: Build EpollController.cc and libappfuse_test after applying future changes locally. Change-Id: Iedce7f35e4397f80cde1054d53261ad94f9e58a8
Diffstat (limited to 'libappfuse/EpollController.cc')
-rw-r--r--libappfuse/EpollController.cc66
1 files changed, 66 insertions, 0 deletions
diff --git a/libappfuse/EpollController.cc b/libappfuse/EpollController.cc
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1/*
2 * Copyright (C) 2017 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 specic language governing permissions and
14 * limitations under the License.
15 */
16
17#include <android-base/logging.h>
18
19#include "libappfuse/EpollController.h"
20
21namespace android {
22namespace fuse {
23
24EpollController::EpollController(base::unique_fd&& poll_fd) : poll_fd_(std::move(poll_fd)) {
25}
26
27bool EpollController::Wait(size_t event_count) {
28 events_.resize(event_count);
29 const int result = TEMP_FAILURE_RETRY(epoll_wait(poll_fd_, events_.data(), event_count, -1));
30 if (result == -1) {
31 PLOG(ERROR) << "Failed to wait for epoll";
32 return false;
33 }
34 events_.resize(result);
35 return true;
36}
37
38bool EpollController::AddFd(int fd, int events, void* data) {
39 return InvokeControl(EPOLL_CTL_ADD, fd, events, data);
40}
41
42bool EpollController::UpdateFd(int fd, int events, void* data) {
43 return InvokeControl(EPOLL_CTL_MOD, fd, events, data);
44}
45
46bool EpollController::RemoveFd(int fd) {
47 return InvokeControl(EPOLL_CTL_DEL, fd, /* events */ 0, nullptr);
48}
49
50const std::vector<epoll_event>& EpollController::events() const {
51 return events_;
52}
53
54bool EpollController::InvokeControl(int op, int fd, int events, void* data) const {
55 epoll_event event;
56 memset(&event, 0, sizeof(event));
57 event.events = events;
58 event.data.ptr = data;
59 if (epoll_ctl(poll_fd_, op, fd, &event) == -1) {
60 PLOG(ERROR) << "epoll_ctl() error op=" << op;
61 return false;
62 }
63 return true;
64}
65}
66}