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