| /* |
| * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "jlong.h" |
| #include "nio_util.h" |
| |
| #include "sun_nio_ch_EPoll.h" |
| |
| #include <dlfcn.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* epoll_wait(2) man page */ |
| |
| typedef union epoll_data { |
| void *ptr; |
| int fd; |
| __uint32_t u32; |
| __uint64_t u64; |
| } epoll_data_t; |
| |
| struct epoll_event { |
| __uint32_t events; /* Epoll events */ |
| epoll_data_t data; /* User data variable */ |
| } __attribute__ ((__packed__)); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| /* |
| * epoll event notification is new in 2.6 kernel. As the offical build |
| * platform for the JDK is on a 2.4-based distribution then we must |
| * obtain the addresses of the epoll functions dynamically. |
| */ |
| typedef int (*epoll_create_t)(int size); |
| typedef int (*epoll_ctl_t) (int epfd, int op, int fd, struct epoll_event *event); |
| typedef int (*epoll_wait_t) (int epfd, struct epoll_event *events, int maxevents, int timeout); |
| |
| static epoll_create_t epoll_create_func; |
| static epoll_ctl_t epoll_ctl_func; |
| static epoll_wait_t epoll_wait_func; |
| |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_EPoll_init(JNIEnv *env, jclass this) |
| { |
| epoll_create_func = (epoll_create_t) dlsym(RTLD_DEFAULT, "epoll_create"); |
| epoll_ctl_func = (epoll_ctl_t) dlsym(RTLD_DEFAULT, "epoll_ctl"); |
| epoll_wait_func = (epoll_wait_t) dlsym(RTLD_DEFAULT, "epoll_wait"); |
| |
| if ((epoll_create_func == NULL) || (epoll_ctl_func == NULL) || |
| (epoll_wait_func == NULL)) { |
| JNU_ThrowInternalError(env, "unable to get address of epoll functions, pre-2.6 kernel?"); |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass this) |
| { |
| return sizeof(struct epoll_event); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass this) |
| { |
| return offsetof(struct epoll_event, events); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass this) |
| { |
| return offsetof(struct epoll_event, data); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_epollCreate(JNIEnv *env, jclass c) { |
| /* |
| * epoll_create expects a size as a hint to the kernel about how to |
| * dimension internal structures. We can't predict the size in advance. |
| */ |
| int epfd = (*epoll_create_func)(256); |
| if (epfd < 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed"); |
| } |
| return epfd; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_epollCtl(JNIEnv *env, jclass c, jint epfd, |
| jint opcode, jint fd, jint events) |
| { |
| struct epoll_event event; |
| int res; |
| |
| event.events = events; |
| event.data.fd = fd; |
| |
| RESTARTABLE((*epoll_ctl_func)(epfd, (int)opcode, (int)fd, &event), res); |
| |
| return (res == 0) ? 0 : errno; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_EPoll_epollWait(JNIEnv *env, jclass c, |
| jint epfd, jlong address, jint numfds) |
| { |
| struct epoll_event *events = jlong_to_ptr(address); |
| int res; |
| |
| RESTARTABLE((*epoll_wait_func)(epfd, events, numfds, -1), res); |
| if (res < 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed"); |
| } |
| return res; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_EPoll_close0(JNIEnv *env, jclass c, jint epfd) { |
| int res; |
| RESTARTABLE(close(epfd), res); |
| } |