1 /*
   2  * Copyright (c) 2002, 2012, 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 /*
  27  */
  28 
  29 #include "jni.h"
  30 #include "jni_util.h"
  31 #include "jvm.h"
  32 #include "jlong.h"
  33 #include "sun_nio_ch_DatagramDispatcher.h"
  34 #include <sys/types.h>
  35 #include <sys/uio.h>
  36 #include <sys/socket.h>
  37 #include <string.h>
  38 
  39 #include "nio_util.h"
  40 #include <limits.h>
  41 
  42 JNIEXPORT jint JNICALL
  43 Java_sun_nio_ch_DatagramDispatcher_read0(JNIEnv *env, jclass clazz,
  44                          jobject fdo, jlong address, jint len)
  45 {
  46     jint fd = fdval(env, fdo);
  47     void *buf = (void *)jlong_to_ptr(address);
  48     int result = recv(fd, buf, len, 0);
  49     if (result < 0 && errno == ECONNREFUSED) {
  50         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  51         return -2;
  52     }
  53 
  54     if (result > 0) {
  55         JVM_callNetworkReadBytes(env, result);
  56     }
  57 
  58     return convertReturnVal(env, result, JNI_TRUE);
  59 }
  60 
  61 
  62 JNIEXPORT jlong JNICALL
  63 Java_sun_nio_ch_DatagramDispatcher_readv0(JNIEnv *env, jclass clazz,
  64                               jobject fdo, jlong address, jint len)
  65 {
  66     jint fd = fdval(env, fdo);
  67     ssize_t result = 0;
  68     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
  69     struct msghdr m;
  70     if (len > IOV_MAX) {
  71         len = IOV_MAX;
  72     }
  73 
  74     // initialize the message
  75     memset(&m, 0, sizeof(m));
  76     m.msg_iov = iov;
  77     m.msg_iovlen = len;
  78 
  79     result = recvmsg(fd, &m, 0);
  80     if (result < 0 && errno == ECONNREFUSED) {
  81         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  82         return -2;
  83     }
  84 
  85     if (result > 0) {
  86         JVM_callNetworkReadBytes(env, result);
  87     }
  88 
  89     return convertLongReturnVal(env, (jlong)result, JNI_TRUE);
  90 }
  91 
  92 JNIEXPORT jint JNICALL
  93 Java_sun_nio_ch_DatagramDispatcher_write0(JNIEnv *env, jclass clazz,
  94                               jobject fdo, jlong address, jint len)
  95 {
  96     jint fd = fdval(env, fdo);
  97     void *buf = (void *)jlong_to_ptr(address);
  98     int result = send(fd, buf, len, 0);
  99     if (result < 0 && errno == ECONNREFUSED) {
 100         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
 101         return -2;
 102     }
 103 
 104     if (result > 0) {
 105         JVM_callNetworkWriteBytes(env, result);
 106     }
 107 
 108     return convertReturnVal(env, result, JNI_FALSE);
 109 }
 110 
 111 JNIEXPORT jlong JNICALL
 112 Java_sun_nio_ch_DatagramDispatcher_writev0(JNIEnv *env, jclass clazz,
 113                                        jobject fdo, jlong address, jint len)
 114 {
 115     jint fd = fdval(env, fdo);
 116     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
 117     struct msghdr m;
 118     ssize_t result = 0;
 119     if (len > IOV_MAX) {
 120         len = IOV_MAX;
 121     }
 122 
 123     // initialize the message
 124     memset(&m, 0, sizeof(m));
 125     m.msg_iov = iov;
 126     m.msg_iovlen = len;
 127 
 128     result = sendmsg(fd, &m, 0);
 129     if (result < 0 && errno == ECONNREFUSED) {
 130         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
 131         return -2;
 132     }
 133 
 134     if (result > 0) {
 135         JVM_callNetworkWriteBytes(env, result);
 136     }
 137 
 138     return convertLongReturnVal(env, (jlong)result, JNI_FALSE);
 139 }