src/java.base/linux/native/libnio/ch/EPoll.c
author alanb
Fri, 23 Mar 2018 14:18:18 +0000
changeset 49290 07779973cbe2
parent 47216 71c04702a3d5
permissions -rw-r--r--
8199791: (se) More Selector cleanup Reviewed-by: redestad, bpb
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/*
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 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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 #include <dlfcn.h>
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 #include <unistd.h>
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 #include <sys/types.h>
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 #include <sys/epoll.h>
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#include "jni.h"
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#include "jni_util.h"
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#include "jvm.h"
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#include "jlong.h"
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#include "nio.h"
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#include "nio_util.h"
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#include "sun_nio_ch_EPoll.h"
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass clazz)
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{
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    return sizeof(struct epoll_event);
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass clazz)
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{
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    return offsetof(struct epoll_event, events);
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass clazz)
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{
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    return offsetof(struct epoll_event, data);
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_create(JNIEnv *env, jclass clazz) {
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    /* size hint not used in modern kernels */
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    int epfd = epoll_create(256);
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    if (epfd < 0) {
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        JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
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    }
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    return epfd;
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_ctl(JNIEnv *env, jclass clazz, jint epfd,
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                          jint opcode, jint fd, jint events)
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{
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    struct epoll_event event;
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    int res;
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    event.events = events;
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    event.data.fd = fd;
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    res = epoll_ctl(epfd, (int)opcode, (int)fd, &event);
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    return (res == 0) ? 0 : errno;
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_EPoll_wait(JNIEnv *env, jclass clazz, jint epfd,
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                           jlong address, jint numfds, jint timeout)
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{
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    struct epoll_event *events = jlong_to_ptr(address);
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    int res = epoll_wait(epfd, events, numfds, timeout);
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    if (res < 0) {
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        if (errno == EINTR) {
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            return IOS_INTERRUPTED;
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        } else {
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            JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
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            return IOS_THROWN;
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        }
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    }
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    return res;
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}