1/* 2 * Copyright (c) 2008, 2011, 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 26#include "jni.h" 27#include "jni_util.h" 28#include "jvm.h" 29#include "jlong.h" 30#include "nio_util.h" 31 32#include "sun_nio_ch_EPoll.h" 33 34#include <dlfcn.h> 35#include <unistd.h> 36#include <sys/types.h> 37#include <sys/epoll.h> 38 39JNIEXPORT jint JNICALL 40Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass this) 41{ 42 return sizeof(struct epoll_event); 43} 44 45JNIEXPORT jint JNICALL 46Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass this) 47{ 48 return offsetof(struct epoll_event, events); 49} 50 51JNIEXPORT jint JNICALL 52Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass this) 53{ 54 return offsetof(struct epoll_event, data); 55} 56 57JNIEXPORT jint JNICALL 58Java_sun_nio_ch_EPoll_epollCreate(JNIEnv *env, jclass c) { 59 /* 60 * epoll_create expects a size as a hint to the kernel about how to 61 * dimension internal structures. We can't predict the size in advance. 62 */ 63 int epfd = epoll_create(256); 64 if (epfd < 0) { 65 JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed"); 66 } 67 return epfd; 68} 69 70JNIEXPORT jint JNICALL 71Java_sun_nio_ch_EPoll_epollCtl(JNIEnv *env, jclass c, jint epfd, 72 jint opcode, jint fd, jint events) 73{ 74 struct epoll_event event; 75 int res; 76 77 event.events = events; 78 event.data.fd = fd; 79 80 RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res); 81 82 return (res == 0) ? 0 : errno; 83} 84 85JNIEXPORT jint JNICALL 86Java_sun_nio_ch_EPoll_epollWait(JNIEnv *env, jclass c, 87 jint epfd, jlong address, jint numfds) 88{ 89 struct epoll_event *events = jlong_to_ptr(address); 90 int res; 91 92 RESTARTABLE(epoll_wait(epfd, events, numfds, -1), res); 93 if (res < 0) { 94 JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed"); 95 } 96 return res; 97} 98