1 /*
   2  * Copyright (c) 1997, 2008, 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 <errno.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 
  32 #include "jni_util.h"
  33 #include "jvm.h"
  34 #include "net_util.h"
  35 
  36 #include "java_net_SocketOutputStream.h"
  37 
  38 #define min(a, b)       ((a) < (b) ? (a) : (b))
  39 
  40 /*
  41  * SocketOutputStream
  42  */
  43 
  44 static jfieldID IO_fd_fdID;
  45 
  46 /*
  47  * Class:     java_net_SocketOutputStream
  48  * Method:    init
  49  * Signature: ()V
  50  */
  51 JNIEXPORT void JNICALL
  52 Java_java_net_SocketOutputStream_init(JNIEnv *env, jclass cls) {
  53     IO_fd_fdID = NET_GetFileDescriptorID(env);
  54 }
  55 
  56 /*
  57  * Class:     java_net_SocketOutputStream
  58  * Method:    socketWrite0
  59  * Signature: (Ljava/io/FileDescriptor;[BII)V
  60  */
  61 JNIEXPORT void JNICALL
  62 Java_java_net_SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,
  63                                               jobject fdObj,
  64                                               jbyteArray data,
  65                                               jint off, jint len) {
  66     char *bufP;
  67     char BUF[MAX_BUFFER_LEN];
  68     int buflen;
  69     int fd;
  70 
  71     if (IS_NULL(fdObj)) {
  72         JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
  73         return;
  74     } else {
  75         fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
  76         /* Bug 4086704 - If the Socket associated with this file descriptor
  77          * was closed (sysCloseFD), the file descriptor is set to -1.
  78          */
  79         if (fd == -1) {
  80             JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
  81             return;
  82         }
  83 
  84     }
  85 
  86     if (len <= MAX_BUFFER_LEN) {
  87         bufP = BUF;
  88         buflen = MAX_BUFFER_LEN;
  89     } else {
  90         buflen = min(MAX_HEAP_BUFFER_LEN, len);
  91         bufP = (char *)malloc((size_t)buflen);
  92 
  93         /* if heap exhausted resort to stack buffer */
  94         if (bufP == NULL) {
  95             bufP = BUF;
  96             buflen = MAX_BUFFER_LEN;
  97         }
  98     }
  99 
 100     while(len > 0) {
 101         int loff = 0;
 102         int chunkLen = min(buflen, len);
 103         int llen = chunkLen;
 104         (*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);
 105 
 106         while(llen > 0) {
 107             int n = NET_Send(fd, bufP + loff, llen, 0);
 108             if (n > 0) {
 109                 llen -= n;
 110                 loff += n;
 111                 continue;
 112             }
 113             if (errno == ECONNRESET) {
 114                 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
 115                     "Connection reset");
 116             } else {
 117                 NET_ThrowByNameWithLastError(env, "java/net/SocketException",
 118                     "Write failed");
 119             }
 120             if (bufP != BUF) {
 121                 free(bufP);
 122             }
 123             return;
 124         }
 125         len -= chunkLen;
 126         off += chunkLen;
 127     }
 128 
 129     if (bufP != BUF) {
 130         free(bufP);
 131     }
 132 }