1 /*
   2  * Copyright (c) 2018, 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 "jdk_internal_net_rdma_RdmaServerSocketChannelImpl.h"
  27 #include "net_util.h"
  28 #include "nio.h"
  29 #include <Rsocket.h>
  30 
  31 static jfieldID fd_fdID;        /* java.io.FileDescriptor.fd */
  32 static jclass isa_class;        /* java.net.InetSocketAddress */
  33 static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
  34 
  35 
  36 JNIEXPORT void JNICALL
  37 Java_jdk_internal_net_rdma_RdmaServerSocketChannelImpl_initIDs(JNIEnv *env,
  38         jclass c) {
  39     loadRdmaFuncs(env);
  40 
  41     jclass cls;
  42 
  43     cls = (*env)->FindClass(env, "java/io/FileDescriptor");
  44     CHECK_NULL(cls);
  45     fd_fdID = (*env)->GetFieldID(env, cls, "fd", "I");
  46     CHECK_NULL(fd_fdID);
  47 
  48     cls = (*env)->FindClass(env, "java/net/InetSocketAddress");
  49     CHECK_NULL(cls);
  50     isa_class = (*env)->NewGlobalRef(env, cls);
  51     if (isa_class == NULL) {
  52         JNU_ThrowOutOfMemoryError(env, NULL);
  53         return;
  54     }
  55     isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",
  56                                      "(Ljava/net/InetAddress;I)V");
  57     CHECK_NULL(isa_ctorID);
  58 }
  59 
  60 JNIEXPORT jint JNICALL
  61 Java_jdk_internal_net_rdma_RdmaServerSocketChannelImpl_accept0(JNIEnv *env,
  62         jobject this, jobject ssfdo, jobject newfdo, jobjectArray isaa) {
  63     jint ssfd = (*env)->GetIntField(env, ssfdo, fd_fdID);
  64     jint newfd;
  65     SOCKETADDRESS sa;
  66     socklen_t sa_len = sizeof(SOCKETADDRESS);
  67     jobject remote_ia = 0;
  68     jobject isa;
  69     jint remote_port = 0;
  70 
  71     /*
  72      * accept connection but ignore ECONNABORTED indicating that
  73      * a connection was eagerly accepted but was reset before
  74      * accept() was called.
  75      */
  76     for (;;) {
  77         newfd = rs_accept(ssfd, &sa.sa, &sa_len);
  78         if (newfd >= 0) {
  79             break;
  80         }
  81         if (errno != ECONNABORTED) {
  82             break;
  83         }
  84         /* ECONNABORTED => restart accept */
  85     }
  86 
  87     if (newfd < 0) {
  88         if (errno == EAGAIN)
  89             return IOS_UNAVAILABLE;
  90         if (errno == EINTR)
  91             return IOS_INTERRUPTED;
  92         JNU_ThrowIOExceptionWithLastError(env, "Accept failed");
  93         return IOS_THROWN;
  94     }
  95 
  96     (*env)->SetIntField(env, newfdo, fd_fdID, newfd);
  97     remote_ia = NET_SockaddrToInetAddress(env, &sa, (int *)&remote_port);
  98     CHECK_NULL_RETURN(remote_ia, IOS_THROWN);
  99     isa = (*env)->NewObject(env, isa_class, isa_ctorID,
 100         remote_ia, remote_port);
 101     CHECK_NULL_RETURN(isa, IOS_THROWN);
 102     (*env)->SetObjectArrayElement(env, isaa, 0, isa);
 103     return 1;
 104 }