1 /*
   2  * Copyright (c) 2000, 2002, 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 <stdlib.h>
  27 #include <netdb.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30 
  31 #if __linux__
  32 #include <netinet/in.h>
  33 #endif
  34 
  35 #if defined(__solaris__) && !defined(_SOCKLEN_T)
  36 typedef size_t socklen_t;       /* New in SunOS 5.7, so need this for 5.6 */
  37 #endif
  38 
  39 #include "jni.h"
  40 #include "jni_util.h"
  41 #include "net_util.h"
  42 #include "jvm.h"
  43 #include "jlong.h"
  44 #include "sun_nio_ch_ServerSocketChannelImpl.h"
  45 #include "nio.h"
  46 #include "nio_util.h"
  47 
  48 
  49 static jfieldID fd_fdID;        /* java.io.FileDescriptor.fd */
  50 static jclass isa_class;        /* java.net.InetSocketAddress */
  51 static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
  52 
  53 
  54 JNIEXPORT void JNICALL
  55 Java_sun_nio_ch_ServerSocketChannelImpl_initIDs(JNIEnv *env, jclass c)
  56 {
  57     jclass cls;
  58 
  59     cls = (*env)->FindClass(env, "java/io/FileDescriptor");
  60     fd_fdID = (*env)->GetFieldID(env, cls, "fd", "I");
  61 
  62     cls = (*env)->FindClass(env, "java/net/InetSocketAddress");
  63     isa_class = (*env)->NewGlobalRef(env, cls);
  64     isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",
  65                                      "(Ljava/net/InetAddress;I)V");
  66 }
  67 
  68 JNIEXPORT void JNICALL
  69 Java_sun_nio_ch_ServerSocketChannelImpl_listen(JNIEnv *env, jclass cl,
  70                                                jobject fdo, jint backlog)
  71 {
  72     if (listen(fdval(env, fdo), backlog) < 0)
  73         handleSocketError(env, errno);
  74 }
  75 
  76 JNIEXPORT jint JNICALL
  77 Java_sun_nio_ch_ServerSocketChannelImpl_accept0(JNIEnv *env, jobject this,
  78                                                 jobject ssfdo, jobject newfdo,
  79                                                 jobjectArray isaa)
  80 {
  81     jint ssfd = (*env)->GetIntField(env, ssfdo, fd_fdID);
  82     jint newfd;
  83     struct sockaddr *sa;
  84     int alloc_len;
  85     jobject remote_ia = 0;
  86     jobject isa;
  87     jint remote_port;
  88 
  89     NET_AllocSockaddr(&sa, &alloc_len);
  90 
  91     /*
  92      * accept connection but ignore ECONNABORTED indicating that
  93      * a connection was eagerly accepted but was reset before
  94      * accept() was called.
  95      */
  96     for (;;) {
  97         socklen_t sa_len = alloc_len;
  98         newfd = accept(ssfd, sa, &sa_len);
  99         if (newfd >= 0) {
 100             break;
 101         }
 102         if (errno != ECONNABORTED) {
 103             break;
 104         }
 105         /* ECONNABORTED => restart accept */
 106     }
 107 
 108     if (newfd < 0) {
 109         free((void *)sa);
 110         if (errno == EAGAIN)
 111             return IOS_UNAVAILABLE;
 112         if (errno == EINTR)
 113             return IOS_INTERRUPTED;
 114         JNU_ThrowIOExceptionWithLastError(env, "Accept failed");
 115         return IOS_THROWN;
 116     }
 117 
 118     (*env)->SetIntField(env, newfdo, fd_fdID, newfd);
 119     remote_ia = NET_SockaddrToInetAddress(env, sa, (int *)&remote_port);
 120     free((void *)sa);
 121     isa = (*env)->NewObject(env, isa_class, isa_ctorID,
 122                             remote_ia, remote_port);
 123     (*env)->SetObjectArrayElement(env, isaa, 0, isa);
 124     return 1;
 125 }