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 21 namespace android { 22 namespace fuse { 23 24 EpollController::EpollController(base::unique_fd&& poll_fd) : poll_fd_(std::move(poll_fd)) { 25 } 26 27 bool 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 38 bool EpollController::AddFd(int fd, int events, void* data) { 39 return InvokeControl(EPOLL_CTL_ADD, fd, events, data); 40 } 41 42 bool EpollController::UpdateFd(int fd, int events, void* data) { 43 return InvokeControl(EPOLL_CTL_MOD, fd, events, data); 44 } 45 46 bool EpollController::RemoveFd(int fd) { 47 return InvokeControl(EPOLL_CTL_DEL, fd, /* events */ 0, nullptr); 48 } 49 50 const std::vector<epoll_event>& EpollController::events() const { 51 return events_; 52 } 53 54 bool 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 } 67
