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 "jvm.h"
33 #include "jni_util.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
42 /************************************************************************
43 * SocketInputStream
44 */
45
46 static jfieldID IO_fd_fdID;
47
48 /*
49 * Class: java_net_SocketInputStream
50 * Method: socketRead0
51 * Signature: (Ljava/io/FileDescriptor;[BIII)I
52 */
53 JNIEXPORT jint JNICALL
SocketInputStream_socketRead0(JNIEnv * env,jobject this,jobject fdObj,jbyteArray data,jint off,jint len,jint timeout)54 SocketInputStream_socketRead0(JNIEnv *env, jobject this,
55 jobject fdObj, jbyteArray data,
56 jint off, jint len, jint timeout)
57 {
58 char BUF[MAX_BUFFER_LEN];
59 char *bufP;
60 jint fd, nread;
61
62 if (IS_NULL(fdObj)) {
63 /* shouldn't this be a NullPointerException? -br */
64 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
65 "Socket closed");
66 return -1;
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), then the file descriptor is set to -1.
71 */
72 if (fd == -1) {
73 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
74 return -1;
75 }
76 }
77
78 /*
79 * If the read is greater than our stack allocated buffer then
80 * we allocate from the heap (up to a limit)
81 */
82 if (len > MAX_BUFFER_LEN) {
83 if (len > MAX_HEAP_BUFFER_LEN) {
84 len = MAX_HEAP_BUFFER_LEN;
85 }
86 bufP = (char *)malloc((size_t)len);
87 if (bufP == NULL) {
88 bufP = BUF;
89 len = MAX_BUFFER_LEN;
90 }
91 } else {
92 bufP = BUF;
93 }
94
95 if (timeout) {
96 nread = NET_Timeout(fd, timeout);
97 if (nread <= 0) {
98 if (nread == 0) {
99 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",
100 "Read timed out");
101 } else if (nread == JVM_IO_ERR) {
102 if (errno == EBADF) {
103 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
104 } else {
105 NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException",
106 "select/poll failed");
107 }
108 } else if (nread == JVM_IO_INTR) {
109 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
110 "Operation interrupted");
111 }
112 if (bufP != BUF) {
113 free(bufP);
114 }
115 return -1;
116 }
117 }
118
119 nread = NET_Read(fd, bufP, len);
120
121 if (nread <= 0) {
122 if (nread < 0) {
123
124 switch (errno) {
125 case ECONNRESET:
126 case EPIPE:
127 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
128 "Connection reset");
129 break;
130
131 case EBADF:
132 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
133 "Socket closed");
134 break;
135
136 case EINTR:
137 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
138 "Operation interrupted");
139 break;
140
141 default:
142 NET_ThrowByNameWithLastError(env,
143 JNU_JAVANETPKG "SocketException", "Read failed");
144 }
145 }
146 } else {
147 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
148 }
149
150 if (bufP != BUF) {
151 free(bufP);
152 }
153 return nread;
154 }
155
156 static JNINativeMethod gMethods[] = {
157 NATIVE_METHOD(SocketInputStream, socketRead0, "(Ljava/io/FileDescriptor;[BIII)I"),
158 };
159
register_java_net_SocketInputStream(JNIEnv * env)160 void register_java_net_SocketInputStream(JNIEnv* env) {
161 jniRegisterNativeMethods(env, "java/net/SocketInputStream", gMethods, NELEM(gMethods));
162
163 // Init field ids
164 IO_fd_fdID = NET_GetFileDescriptorID(env);
165 }
166