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     return convertReturnVal(env, result, JNI_TRUE);
  54 }
  55 
  56 
  57 JNIEXPORT jlong JNICALL
  58 Java_sun_nio_ch_DatagramDispatcher_readv0(JNIEnv *env, jclass clazz,
  59                               jobject fdo, jlong address, jint len)
  60 {
  61     jint fd = fdval(env, fdo);
  62     ssize_t result = 0;
  63     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
  64     struct msghdr m;
  65     if (len > IOV_MAX) {
  66         len = IOV_MAX;
  67     }
  68 
  69     // initialize the message
  70     memset(&m, 0, sizeof(m));
  71     m.msg_iov = iov;
  72     m.msg_iovlen = len;
  73 
  74     result = recvmsg(fd, &m, 0);
  75     if (result < 0 && errno == ECONNREFUSED) {
  76         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  77         return -2;
  78     }
  79     return convertLongReturnVal(env, (jlong)result, JNI_TRUE);
  80 }
  81 
  82 JNIEXPORT jint JNICALL
  83 Java_sun_nio_ch_DatagramDispatcher_write0(JNIEnv *env, jclass clazz,
  84                               jobject fdo, jlong address, jint len)
  85 {
  86     jint fd = fdval(env, fdo);
  87     void *buf = (void *)jlong_to_ptr(address);
  88     int result = send(fd, buf, len, 0);
  89     if (result < 0 && errno == ECONNREFUSED) {
  90         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  91         return -2;
  92     }
  93     return convertReturnVal(env, result, JNI_FALSE);
  94 }
  95 
  96 JNIEXPORT jlong JNICALL
  97 Java_sun_nio_ch_DatagramDispatcher_writev0(JNIEnv *env, jclass clazz,
  98                                        jobject fdo, jlong address, jint len)
  99 {
 100     jint fd = fdval(env, fdo);
 101     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
 102     struct msghdr m;
 103     ssize_t result = 0;
 104     if (len > IOV_MAX) {
 105         len = IOV_MAX;
 106     }
 107 
 108     // initialize the message
 109     memset(&m, 0, sizeof(m));
 110     m.msg_iov = iov;
 111     m.msg_iovlen = len;
 112 
 113     result = sendmsg(fd, &m, 0);
 114     if (result < 0 && errno == ECONNREFUSED) {
 115         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
 116         return -2;
 117     }
 118     return convertLongReturnVal(env, (jlong)result, JNI_FALSE);
 119 }