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