SocketOutputStream.c revision 240109a2df3fb0699cdaf919b490d34668814a4e 
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 "JNIHelp.h"
37
38#define NATIVE_METHOD(className, functionName, signature) \
39{ #functionName, signature, (void*)(className ## _ ## functionName) }
40
41#define min(a, b)       ((a) < (b) ? (a) : (b))
42
43/*
44 * SocketOutputStream
45 */
46
47static jfieldID IO_fd_fdID;
48
49/*
50 * Class:     java_net_SocketOutputStream
51 * Method:    init
52 * Signature: ()V
53 */
54JNIEXPORT void JNICALL
55SocketOutputStream_init(JNIEnv *env, jclass cls) {
56    IO_fd_fdID = NET_GetFileDescriptorID(env);
57}
58
59/*
60 * Class:     java_net_SocketOutputStream
61 * Method:    socketWrite0
62 * Signature: (Ljava/io/FileDescriptor;[BII)V
63 */
64JNIEXPORT void JNICALL
65SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,
66                                              jobject fdObj,
67                                              jbyteArray data,
68                                              jint off, jint len) {
69    char *bufP;
70    char BUF[MAX_BUFFER_LEN];
71    int buflen;
72    int fd;
73
74    if (IS_NULL(fdObj)) {
75        JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
76        return;
77    } else {
78        fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
79        /* Bug 4086704 - If the Socket associated with this file descriptor
80         * was closed (sysCloseFD), the the file descriptor is set to -1.
81         */
82        if (fd == -1) {
83            JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
84            return;
85        }
86
87    }
88
89    if (len <= MAX_BUFFER_LEN) {
90        bufP = BUF;
91        buflen = MAX_BUFFER_LEN;
92    } else {
93        buflen = min(MAX_HEAP_BUFFER_LEN, len);
94        bufP = (char *)malloc((size_t)buflen);
95
96        /* if heap exhausted resort to stack buffer */
97        if (bufP == NULL) {
98            bufP = BUF;
99            buflen = MAX_BUFFER_LEN;
100        }
101    }
102
103    while(len > 0) {
104        int loff = 0;
105        int chunkLen = min(buflen, len);
106        int llen = chunkLen;
107        (*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);
108
109        while(llen > 0) {
110            int n = NET_Send(fd, bufP + loff, llen, 0);
111            if (n > 0) {
112                llen -= n;
113                loff += n;
114                continue;
115            }
116            if (n == JVM_IO_INTR) {
117                JNU_ThrowByName(env, "java/io/InterruptedIOException", 0);
118            } else {
119                if (errno == ECONNRESET) {
120                    JNU_ThrowByName(env, "sun/net/ConnectionResetException",
121                        "Connection reset");
122                } else {
123                    NET_ThrowByNameWithLastError(env, "java/net/SocketException",
124                        "Write failed");
125                }
126            }
127            if (bufP != BUF) {
128                free(bufP);
129            }
130            return;
131        }
132        len -= chunkLen;
133        off += chunkLen;
134    }
135
136    if (bufP != BUF) {
137        free(bufP);
138    }
139}
140
141static JNINativeMethod gMethods[] = {
142  NATIVE_METHOD(SocketOutputStream, socketWrite0, "(Ljava/io/FileDescriptor;[BII)V"),
143  NATIVE_METHOD(SocketOutputStream, init, "()V"),
144};
145
146void register_java_net_SocketOutputStream(JNIEnv* env) {
147  jniRegisterNativeMethods(env, "java/net/SocketOutputStream", gMethods, NELEM(gMethods));
148}
149