1 /*
   2  * Copyright (c) 2002, 2020, 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 <sys/types.h>
  27 #include <sys/uio.h>
  28 #include <sys/socket.h>
  29 #include <string.h>
  30 #include <limits.h>
  31 
  32 #include "jni.h"
  33 #include "jni_util.h"
  34 #include "jvm.h"
  35 #include "jlong.h"
  36 #include "nio.h"
  37 #include "nio_util.h"
  38 #include "sun_nio_ch_DatagramDispatcher.h"
  39 
  40 JNIEXPORT jint JNICALL
  41 Java_sun_nio_ch_DatagramDispatcher_read0(JNIEnv *env, jclass clazz,
  42                                          jobject fdo, jlong address, jint len)
  43 {
  44     jint fd = fdval(env, fdo);
  45     void *buf = (void *)jlong_to_ptr(address);
  46     int result = recv(fd, buf, len, 0);
  47     if (result < 0 && errno == ECONNREFUSED) {
  48         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  49         return IOS_THROWN;
  50     }
  51     return convertReturnVal(env, result, JNI_TRUE);
  52 }
  53 
  54 
  55 JNIEXPORT jlong JNICALL
  56 Java_sun_nio_ch_DatagramDispatcher_readv0(JNIEnv *env, jclass clazz,
  57                                           jobject fdo, jlong address, jint len)
  58 {
  59     jint fd = fdval(env, fdo);
  60     ssize_t result = 0;
  61     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
  62     struct msghdr m;
  63     if (len > IOV_MAX) {
  64         len = IOV_MAX;
  65     }
  66 
  67     // initialize the message
  68     memset(&m, 0, sizeof(m));
  69     m.msg_iov = iov;
  70     m.msg_iovlen = len;
  71 
  72     result = recvmsg(fd, &m, 0);
  73     if (result < 0 && errno == ECONNREFUSED) {
  74         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  75         return IOS_THROWN;
  76     }
  77     return convertLongReturnVal(env, (jlong)result, JNI_TRUE);
  78 }
  79 
  80 JNIEXPORT jint JNICALL
  81 Java_sun_nio_ch_DatagramDispatcher_write0(JNIEnv *env, jclass clazz,
  82                                           jobject fdo, jlong address, jint len)
  83 {
  84     jint fd = fdval(env, fdo);
  85     void *buf = (void *)jlong_to_ptr(address);
  86     int result = send(fd, buf, len, 0);
  87     if (result < 0 && errno == ECONNREFUSED) {
  88         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
  89         return IOS_THROWN;
  90     }
  91     return convertReturnVal(env, result, JNI_FALSE);
  92 }
  93 
  94 JNIEXPORT jlong JNICALL
  95 Java_sun_nio_ch_DatagramDispatcher_writev0(JNIEnv *env, jclass clazz,
  96                                            jobject fdo, jlong address, jint len)
  97 {
  98     jint fd = fdval(env, fdo);
  99     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
 100     struct msghdr m;
 101     ssize_t result = 0;
 102     if (len > IOV_MAX) {
 103         len = IOV_MAX;
 104     }
 105 
 106     // initialize the message
 107     memset(&m, 0, sizeof(m));
 108     m.msg_iov = iov;
 109     m.msg_iovlen = len;
 110 
 111     result = sendmsg(fd, &m, 0);
 112     if (result < 0 && errno == ECONNREFUSED) {
 113         JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
 114         return IOS_THROWN;
 115     }
 116     return convertLongReturnVal(env, (jlong)result, JNI_FALSE);
 117 }