1 /* 2 * Copyright (C) 2018 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 <sys/eventfd.h> 18 19 #include <log/log.h> 20 #include <ui/BufferHubEventFd.h> 21 22 namespace android { 23 24 BufferHubEventFd::BufferHubEventFd() : mFd(eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK)) {} 25 26 BufferHubEventFd::BufferHubEventFd(int fd) : mFd(fd) {} 27 28 status_t BufferHubEventFd::signal() const { 29 if (!isValid()) { 30 ALOGE("%s: cannot signal an invalid eventfd.", __FUNCTION__); 31 return DEAD_OBJECT; 32 } 33 34 eventfd_write(mFd.get(), 1); 35 return OK; 36 } 37 38 status_t BufferHubEventFd::clear() const { 39 if (!isValid()) { 40 ALOGE("%s: cannot clear an invalid eventfd.", __FUNCTION__); 41 return DEAD_OBJECT; 42 } 43 44 eventfd_t value; 45 eventfd_read(mFd.get(), &value); 46 return OK; 47 } 48 49 } // namespace android 50
