1 /* 2 * Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package sun.nio.ch; 26 27 import java.io.IOException; 28 import static sun.nio.ch.WEPoll.*; 29 30 /** 31 * Poller implementation based on wepoll. 32 */ 33 class WEPollPoller extends Poller { 34 private static final int MAX_EVENTS_TO_POLL = 256; 35 private static final int ENOENT = 2; 36 37 private final long handle; 38 private final int event; 39 private final long address; 40 41 WEPollPoller(boolean read) throws IOException { 42 this.handle = WEPoll.create(); 43 this.event = (read) ? EPOLLIN : EPOLLOUT; 44 this.address = WEPoll.allocatePollArray(MAX_EVENTS_TO_POLL); 45 } 46 47 @Override 48 void implRegister(int fdVal) throws IOException { 49 int err = WEPoll.ctl(handle, EPOLL_CTL_ADD, fdVal, (event | EPOLLONESHOT)); 50 if (err != 0) 51 throw new IOException("epoll_ctl failed: " + err); 52 } 53 54 @Override 55 void implDeregister(int fdVal, boolean polled) { 56 WEPoll.ctl(handle, EPOLL_CTL_DEL, fdVal, 0); 57 } 58 59 @Override 60 int poll(int timeout) throws IOException { 61 int n = WEPoll.wait(handle, address, MAX_EVENTS_TO_POLL, timeout); 62 int i = 0; 63 while (i < n) { 64 long event = WEPoll.getEvent(address, i); 65 int fdVal = WEPoll.getDescriptor(event); 66 polled(fdVal); 67 i++; 68 } 69 return n; 70 } 71 } 72