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
39 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_eventSize(JNIEnv * env,jclass this)40 Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass this)
41 {
42 return sizeof(struct epoll_event);
43 }
44
45 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv * env,jclass this)46 Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass this)
47 {
48 return offsetof(struct epoll_event, events);
49 }
50
51 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_dataOffset(JNIEnv * env,jclass this)52 Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass this)
53 {
54 return offsetof(struct epoll_event, data);
55 }
56
57 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollCreate(JNIEnv * env,jclass c)58 Java_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 // Android-changed: Avoid FD leaks through epoll_create. http://b/120983106
64 // int epfd = epoll_create(256);
65 int epfd = epoll_create1(EPOLL_CLOEXEC);
66 if (epfd < 0) {
67 JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
68 }
69 return epfd;
70 }
71
72 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollCtl(JNIEnv * env,jclass c,jint epfd,jint opcode,jint fd,jint events)73 Java_sun_nio_ch_EPoll_epollCtl(JNIEnv *env, jclass c, jint epfd,
74 jint opcode, jint fd, jint events)
75 {
76 struct epoll_event event;
77 int res;
78
79 event.events = events;
80 event.data.fd = fd;
81
82 RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res);
83
84 return (res == 0) ? 0 : errno;
85 }
86
87 JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollWait(JNIEnv * env,jclass c,jint epfd,jlong address,jint numfds)88 Java_sun_nio_ch_EPoll_epollWait(JNIEnv *env, jclass c,
89 jint epfd, jlong address, jint numfds)
90 {
91 struct epoll_event *events = jlong_to_ptr(address);
92 int res;
93
94 RESTARTABLE(epoll_wait(epfd, events, numfds, -1), res);
95 if (res < 0) {
96 JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
97 }
98 return res;
99 }
100
101 JNIEXPORT void JNICALL
Java_sun_nio_ch_EPoll_close0(JNIEnv * env,jclass c,jint epfd)102 Java_sun_nio_ch_EPoll_close0(JNIEnv *env, jclass c, jint epfd) {
103 int res;
104 RESTARTABLE(close(epfd), res);
105 }
106