1 /* 2 * Copyright (c) 2000, 2019, 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 <sys/mman.h> 27 #include <sys/stat.h> 28 #include <fcntl.h> 29 #include <sys/types.h> 30 #include <unistd.h> 31 32 #if defined(__linux__) || defined(__solaris__) 33 #include <sys/sendfile.h> 34 #elif defined(_AIX) 35 #include <string.h> 36 #include <sys/socket.h> 37 #elif defined(_ALLBSD_SOURCE) 38 #include <sys/socket.h> 39 #include <sys/uio.h> 40 #define lseek64 lseek 41 #define mmap64 mmap 42 #endif 43 44 #include "jni.h" 45 #include "jni_util.h" 46 #include "jlong.h" 47 #include "nio.h" 48 #include "nio_util.h" 49 #include "sun_nio_ch_FileChannelImpl.h" 50 #include "java_lang_Integer.h" 51 52 static jfieldID chan_fd; /* jobject 'fd' in sun.nio.ch.FileChannelImpl */ 53 54 JNIEXPORT jlong JNICALL 55 Java_sun_nio_ch_FileChannelImpl_initIDs(JNIEnv *env, jclass clazz) 56 { 57 jlong pageSize = sysconf(_SC_PAGESIZE); 58 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;"); 59 return pageSize; 60 } 61 62 static jlong 63 handle(JNIEnv *env, jlong rv, char *msg) 64 { 65 if (rv >= 0) 66 return rv; 67 if (errno == EINTR) 68 return IOS_INTERRUPTED; 69 JNU_ThrowIOExceptionWithLastError(env, msg); 70 return IOS_THROWN; 71 } 72 73 74 JNIEXPORT jlong JNICALL 75 Java_sun_nio_ch_FileChannelImpl_map0(JNIEnv *env, jobject this, 76 jint prot, jlong off, jlong len) 77 { 78 void *mapAddress = 0; 79 jobject fdo = (*env)->GetObjectField(env, this, chan_fd); 80 jint fd = fdval(env, fdo); 81 int protections = 0; 82 int flags = 0; 83 84 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) { 85 protections = PROT_READ; 86 flags = MAP_SHARED; 87 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) { 88 protections = PROT_WRITE | PROT_READ; 89 flags = MAP_SHARED; 90 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) { 91 protections = PROT_WRITE | PROT_READ; 92 flags = MAP_PRIVATE; 93 } 94 95 mapAddress = mmap64( 96 0, /* Let OS decide location */ 97 len, /* Number of bytes to map */ 98 protections, /* File permissions */ 99 flags, /* Changes are shared */ 100 fd, /* File descriptor of mapped file */ 101 off); /* Offset into file */ 102 103 if (mapAddress == MAP_FAILED) { 104 if (errno == ENOMEM) { 105 JNU_ThrowOutOfMemoryError(env, "Map failed"); 106 return IOS_THROWN; 107 } 108 return handle(env, -1, "Map failed"); 109 } 110 111 return ((jlong) (unsigned long) mapAddress); 112 } 113 114 115 JNIEXPORT jint JNICALL 116 Java_sun_nio_ch_FileChannelImpl_unmap0(JNIEnv *env, jobject this, 117 jlong address, jlong len) 118 { 119 void *a = (void *)jlong_to_ptr(address); 120 return handle(env, 121 munmap(a, (size_t)len), 122 "Unmap failed"); 123 } 124 125 JNIEXPORT jlong JNICALL 126 Java_sun_nio_ch_FileChannelImpl_transferTo0(JNIEnv *env, jobject this, 127 jobject srcFDO, 128 jlong position, jlong count, 129 jobject dstFDO) 130 { 131 jint srcFD = fdval(env, srcFDO); 132 jint dstFD = fdval(env, dstFDO); 133 134 #if defined(__linux__) 135 off64_t offset = (off64_t)position; 136 jlong n = sendfile64(dstFD, srcFD, &offset, (size_t)count); 137 if (n < 0) { 138 if (errno == EAGAIN) 139 return IOS_UNAVAILABLE; 140 if ((errno == EINVAL) && ((ssize_t)count >= 0)) 141 return IOS_UNSUPPORTED_CASE; 142 if (errno == EINTR) { 143 return IOS_INTERRUPTED; 144 } 145 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed"); 146 return IOS_THROWN; 147 } 148 return n; 149 #elif defined (__solaris__) 150 sendfilevec64_t sfv; 151 size_t numBytes = 0; 152 jlong result; 153 154 sfv.sfv_fd = srcFD; 155 sfv.sfv_flag = 0; 156 sfv.sfv_off = (off64_t)position; 157 sfv.sfv_len = count; 158 159 result = sendfilev64(dstFD, &sfv, 1, &numBytes); 160 161 /* Solaris sendfilev() will return -1 even if some bytes have been 162 * transferred, so we check numBytes first. 163 */ 164 if (numBytes > 0) 165 return numBytes; 166 if (result < 0) { 167 if (errno == EAGAIN) 168 return IOS_UNAVAILABLE; 169 if (errno == EOPNOTSUPP) 170 return IOS_UNSUPPORTED_CASE; 171 if ((errno == EINVAL) && ((ssize_t)count >= 0)) 172 return IOS_UNSUPPORTED_CASE; 173 if (errno == EINTR) 174 return IOS_INTERRUPTED; 175 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed"); 176 return IOS_THROWN; 177 } 178 return result; 179 #elif defined(__APPLE__) 180 off_t numBytes; 181 int result; 182 183 numBytes = count; 184 185 result = sendfile(srcFD, dstFD, position, &numBytes, NULL, 0); 186 187 if (numBytes > 0) 188 return numBytes; 189 190 if (result == -1) { 191 if (errno == EAGAIN) 192 return IOS_UNAVAILABLE; 193 if (errno == EOPNOTSUPP || errno == ENOTSOCK || errno == ENOTCONN) 194 return IOS_UNSUPPORTED_CASE; 195 if ((errno == EINVAL) && ((ssize_t)count >= 0)) 196 return IOS_UNSUPPORTED_CASE; 197 if (errno == EINTR) 198 return IOS_INTERRUPTED; 199 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed"); 200 return IOS_THROWN; 201 } 202 203 return result; 204 205 #elif defined(_AIX) 206 jlong max = (jlong)java_lang_Integer_MAX_VALUE; 207 struct sf_parms sf_iobuf; 208 jlong result; 209 210 if (position > max) 211 return IOS_UNSUPPORTED_CASE; 212 213 if (count > max) 214 count = max; 215 216 memset(&sf_iobuf, 0, sizeof(sf_iobuf)); 217 sf_iobuf.file_descriptor = srcFD; 218 sf_iobuf.file_offset = (off_t)position; 219 sf_iobuf.file_bytes = count; 220 221 result = send_file(&dstFD, &sf_iobuf, SF_SYNC_CACHE); 222 223 /* AIX send_file() will return 0 when this operation complete successfully, 224 * return 1 when partial bytes transfered and return -1 when an error has 225 * Occured. 226 */ 227 if (result == -1) { 228 if (errno == EWOULDBLOCK) 229 return IOS_UNAVAILABLE; 230 if ((errno == EINVAL) && ((ssize_t)count >= 0)) 231 return IOS_UNSUPPORTED_CASE; 232 if (errno == EINTR) 233 return IOS_INTERRUPTED; 234 if (errno == ENOTSOCK) 235 return IOS_UNSUPPORTED; 236 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed"); 237 return IOS_THROWN; 238 } 239 240 if (sf_iobuf.bytes_sent > 0) 241 return (jlong)sf_iobuf.bytes_sent; 242 243 return IOS_UNSUPPORTED_CASE; 244 #else 245 return IOS_UNSUPPORTED_CASE; 246 #endif 247 } 248