1/* 2 * Copyright (c) 1997, 2016, 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 "net_util.h" 30 31#include "java_net_SocketInputStream.h" 32 33/* 34 * SocketInputStream 35 */ 36 37static jfieldID IO_fd_fdID; 38 39/* 40 * Class: java_net_SocketInputStream 41 * Method: init 42 * Signature: ()V 43 */ 44JNIEXPORT void JNICALL 45Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) { 46 IO_fd_fdID = NET_GetFileDescriptorID(env); 47} 48 49static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) { 50 int result = 0; 51 long prevtime = NET_GetCurrentTime(), newtime; 52 while (timeout > 0) { 53 result = NET_TimeoutWithCurrentTime(fd, timeout, prevtime); 54 if (result <= 0) { 55 if (result == 0) { 56 JNU_ThrowByName(env, "java/net/SocketTimeoutException", "Read timed out"); 57 } else if (result == -1) { 58 if (errno == EBADF) { 59 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed"); 60 } else if (errno == ENOMEM) { 61 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed"); 62 } else { 63 JNU_ThrowByNameWithMessageAndLastError 64 (env, "java/net/SocketException", "select/poll failed"); 65 } 66 } 67 return -1; 68 } 69 result = NET_NonBlockingRead(fd, bufP, len); 70 if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) { 71 newtime = NET_GetCurrentTime(); 72 timeout -= newtime - prevtime; 73 if (timeout > 0) { 74 prevtime = newtime; 75 } 76 } else { 77 break; 78 } 79 } 80 return result; 81} 82 83/* 84 * Class: java_net_SocketInputStream 85 * Method: socketRead0 86 * Signature: (Ljava/io/FileDescriptor;[BIII)I 87 */ 88JNIEXPORT jint JNICALL 89Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this, 90 jobject fdObj, jbyteArray data, 91 jint off, jint len, jint timeout) 92{ 93 char BUF[MAX_BUFFER_LEN]; 94 char *bufP; 95 jint fd, nread; 96 97 if (IS_NULL(fdObj)) { 98 JNU_ThrowByName(env, "java/net/SocketException", 99 "Socket closed"); 100 return -1; 101 } 102 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID); 103 if (fd == -1) { 104 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed"); 105 return -1; 106 } 107 108 /* 109 * If the read is greater than our stack allocated buffer then 110 * we allocate from the heap (up to a limit) 111 */ 112 if (len > MAX_BUFFER_LEN) { 113 if (len > MAX_HEAP_BUFFER_LEN) { 114 len = MAX_HEAP_BUFFER_LEN; 115 } 116 bufP = (char *)malloc((size_t)len); 117 if (bufP == NULL) { 118 bufP = BUF; 119 len = MAX_BUFFER_LEN; 120 } 121 } else { 122 bufP = BUF; 123 } 124 if (timeout) { 125 nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout); 126 if ((*env)->ExceptionCheck(env)) { 127 if (bufP != BUF) { 128 free(bufP); 129 } 130 return nread; 131 } 132 } else { 133 nread = NET_Read(fd, bufP, len); 134 } 135 136 if (nread <= 0) { 137 if (nread < 0) { 138 139 switch (errno) { 140 case ECONNRESET: 141 case EPIPE: 142 JNU_ThrowByName(env, "sun/net/ConnectionResetException", 143 "Connection reset"); 144 break; 145 146 case EBADF: 147 JNU_ThrowByName(env, "java/net/SocketException", 148 "Socket closed"); 149 break; 150 151 case EINTR: 152 JNU_ThrowByName(env, "java/io/InterruptedIOException", 153 "Operation interrupted"); 154 break; 155 default: 156 JNU_ThrowByNameWithMessageAndLastError 157 (env, "java/net/SocketException", "Read failed"); 158 } 159 } 160 } else { 161 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP); 162 } 163 164 if (bufP != BUF) { 165 free(bufP); 166 } 167 return nread; 168} 169