/* * Copyright (C) 2017 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specic language governing permissions and * limitations under the License. */ #include <android-base/logging.h> #include "libappfuse/EpollController.h" namespace android { namespace fuse { EpollController::EpollController(base::unique_fd&& poll_fd) : poll_fd_(std::move(poll_fd)) { } bool EpollController::Wait(size_t event_count) { events_.resize(event_count); const int result = TEMP_FAILURE_RETRY(epoll_wait(poll_fd_, events_.data(), event_count, -1)); if (result == -1) { PLOG(ERROR) << "Failed to wait for epoll"; return false; } events_.resize(result); return true; } bool EpollController::AddFd(int fd, int events, void* data) { return InvokeControl(EPOLL_CTL_ADD, fd, events, data); } bool EpollController::UpdateFd(int fd, int events, void* data) { return InvokeControl(EPOLL_CTL_MOD, fd, events, data); } bool EpollController::RemoveFd(int fd) { return InvokeControl(EPOLL_CTL_DEL, fd, /* events */ 0, nullptr); } const std::vector<epoll_event>& EpollController::events() const { return events_; } bool EpollController::InvokeControl(int op, int fd, int events, void* data) const { epoll_event event; memset(&event, 0, sizeof(event)); event.events = events; event.data.ptr = data; if (epoll_ctl(poll_fd_, op, fd, &event) == -1) { PLOG(ERROR) << "epoll_ctl() error op=" << op; return false; } return true; } } }