1/*
2 * Copyright (c) 1997, 2017, 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#include <errno.h>
26#include <stdlib.h>
27#include <string.h>
28
29#include "jvm.h"
30#include "net_util.h"
31
32#include "java_net_SocketInputStream.h"
33
34/*
35 * SocketInputStream
36 */
37
38static jfieldID IO_fd_fdID;
39
40/*
41 * Class: java_net_SocketInputStream
42 * Method: init
43 * Signature: ()V
44 */
45JNIEXPORT void JNICALL
46Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) {
47 IO_fd_fdID = NET_GetFileDescriptorID(env);
48}
49
50static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) {
51 int result = 0;
52 jlong prevNanoTime = JVM_NanoTime(env, 0);
53 jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
54 while (nanoTimeout >= NET_NSEC_PER_MSEC) {
55 result = NET_Timeout(env, fd, nanoTimeout / NET_NSEC_PER_MSEC, prevNanoTime);
56 if (result <= 0) {
57 if (result == 0) {
58 JNU_ThrowByName(env, "java/net/SocketTimeoutException", "Read timed out");
59 } else if (result == -1) {
60 if (errno == EBADF) {
61 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
62 } else if (errno == ENOMEM) {
63 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed");
64 } else {
65 JNU_ThrowByNameWithMessageAndLastError
66 (env, "java/net/SocketException", "select/poll failed");
67 }
68 }
69 return -1;
70 }
71 result = NET_NonBlockingRead(fd, bufP, len);
72 if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
73 jlong newtNanoTime = JVM_NanoTime(env, 0);
74 nanoTimeout -= newtNanoTime - prevNanoTime;
75 if (nanoTimeout >= NET_NSEC_PER_MSEC) {
76 prevNanoTime = newtNanoTime;
77 }
78 } else {
79 break;
80 }
81 }
82 return result;
83}
84
85/*
86 * Class: java_net_SocketInputStream
87 * Method: socketRead0
88 * Signature: (Ljava/io/FileDescriptor;[BIII)I
89 */
90JNIEXPORT jint JNICALL
91Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
92 jobject fdObj, jbyteArray data,
93 jint off, jint len, jint timeout)
94{
95 char BUF[MAX_BUFFER_LEN];
96 char *bufP;
97 jint fd, nread;
98
99 if (IS_NULL(fdObj)) {
100 JNU_ThrowByName(env, "java/net/SocketException",
101 "Socket closed");
102 return -1;
103 }
104 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
105 if (fd == -1) {
106 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
107 return -1;
108 }
109
110 /*
111 * If the read is greater than our stack allocated buffer then
112 * we allocate from the heap (up to a limit)
113 */
114 if (len > MAX_BUFFER_LEN) {
115 if (len > MAX_HEAP_BUFFER_LEN) {
116 len = MAX_HEAP_BUFFER_LEN;
117 }
118 bufP = (char *)malloc((size_t)len);
119 if (bufP == NULL) {
120 bufP = BUF;
121 len = MAX_BUFFER_LEN;
122 }
123 } else {
124 bufP = BUF;
125 }
126 if (timeout) {
127 nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout);
128 if ((*env)->ExceptionCheck(env)) {
129 if (bufP != BUF) {
130 free(bufP);
131 }
132 return nread;
133 }
134 } else {
135 nread = NET_Read(fd, bufP, len);
136 }
137
138 if (nread <= 0) {
139 if (nread < 0) {
140
141 switch (errno) {
142 case ECONNRESET:
143 case EPIPE:
144 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
145 "Connection reset");
146 break;
147
148 case EBADF:
149 JNU_ThrowByName(env, "java/net/SocketException",
150 "Socket closed");
151 break;
152
153 case EINTR:
154 JNU_ThrowByName(env, "java/io/InterruptedIOException",
155 "Operation interrupted");
156 break;
157 default:
158 JNU_ThrowByNameWithMessageAndLastError
159 (env, "java/net/SocketException", "Read failed");
160 }
161 }
162 } else {
163 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
164 }
165
166 if (bufP != BUF) {
167 free(bufP);
168 }
169 return nread;
170}
171