893N/A/*
2362N/A * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
893N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
893N/A *
893N/A * This code is free software; you can redistribute it and/or modify it
893N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
893N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
893N/A *
893N/A * This code is distributed in the hope that it will be useful, but WITHOUT
893N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
893N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
893N/A * version 2 for more details (a copy is included in the LICENSE file that
893N/A * accompanied this code).
893N/A *
893N/A * You should have received a copy of the GNU General Public License version
893N/A * 2 along with this work; if not, write to the Free Software Foundation,
893N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
893N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
893N/A */
893N/A
893N/Apackage sun.nio.ch;
893N/A
893N/Aimport java.io.IOException;
893N/Aimport sun.misc.Unsafe;
893N/A
893N/A/**
893N/A * Provides access to the Linux epoll facility.
893N/A */
893N/A
893N/Aclass EPoll {
893N/A private EPoll() { }
893N/A
893N/A private static final Unsafe unsafe = Unsafe.getUnsafe();
893N/A
893N/A /**
893N/A * typedef union epoll_data {
893N/A * void *ptr;
893N/A * int fd;
893N/A * __uint32_t u32;
893N/A * __uint64_t u64;
893N/A * } epoll_data_t;
893N/A *
893N/A * struct epoll_event {
893N/A * __uint32_t events;
893N/A * epoll_data_t data;
893N/A * }
893N/A */
893N/A private static final int SIZEOF_EPOLLEVENT = eventSize();
893N/A private static final int OFFSETOF_EVENTS = eventsOffset();
893N/A private static final int OFFSETOF_FD = dataOffset();
893N/A
893N/A // opcodes
893N/A static final int EPOLL_CTL_ADD = 1;
893N/A static final int EPOLL_CTL_DEL = 2;
893N/A static final int EPOLL_CTL_MOD = 3;
893N/A
893N/A // flags
893N/A static final int EPOLLONESHOT = (1 << 30);
893N/A
893N/A /**
893N/A * Allocates a poll array to handle up to {@code count} events.
893N/A */
893N/A static long allocatePollArray(int count) {
893N/A return unsafe.allocateMemory(count * SIZEOF_EPOLLEVENT);
893N/A }
893N/A
893N/A /**
893N/A * Free a poll array
893N/A */
893N/A static void freePollArray(long address) {
893N/A unsafe.freeMemory(address);
893N/A }
893N/A
893N/A /**
893N/A * Returns event[i];
893N/A */
893N/A static long getEvent(long address, int i) {
893N/A return address + (SIZEOF_EPOLLEVENT*i);
893N/A }
893N/A
893N/A /**
893N/A * Returns event->data.fd
893N/A */
893N/A static int getDescriptor(long eventAddress) {
893N/A return unsafe.getInt(eventAddress + OFFSETOF_FD);
893N/A }
893N/A
893N/A /**
893N/A * Returns event->events
893N/A */
893N/A static int getEvents(long eventAddress) {
893N/A return unsafe.getInt(eventAddress + OFFSETOF_EVENTS);
893N/A }
893N/A
893N/A // -- Native methods --
893N/A
893N/A private static native int eventSize();
893N/A
893N/A private static native int eventsOffset();
893N/A
893N/A private static native int dataOffset();
893N/A
893N/A static native int epollCreate() throws IOException;
893N/A
893N/A static native int epollCtl(int epfd, int opcode, int fd, int events);
893N/A
893N/A static native int epollWait(int epfd, long pollAddress, int numfds)
893N/A throws IOException;
893N/A
893N/A static {
893N/A Util.load();
893N/A }
893N/A}