1/* 2 * Copyright (c) 2000, 2012, 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 "jni.h" 27#include "jni_util.h" 28#include "jvm.h" 29#include "jlong.h" 30#include "sun_nio_ch_FileDispatcherImpl.h" 31#include "java_lang_Long.h" 32#include <sys/types.h> 33#include <sys/socket.h> 34#include <fcntl.h> 35#include <sys/uio.h> 36#include <unistd.h> 37#if defined(__linux__) 38#include <linux/fs.h> 39#include <sys/ioctl.h> 40#endif 41#include "nio.h" 42#include "nio_util.h" 43#include "JNIHelp.h" 44 45#define NATIVE_METHOD(className, functionName, signature) \ 46{ #functionName, signature, (void*)(className ## _ ## functionName) } 47 48#ifdef _ALLBSD_SOURCE 49#define stat64 stat 50#define flock64 flock 51#define off64_t off_t 52#define F_SETLKW64 F_SETLKW 53#define F_SETLK64 F_SETLK 54 55#define pread64 pread 56#define pwrite64 pwrite 57#define ftruncate64 ftruncate 58#define fstat64 fstat 59 60#define fdatasync fsync 61#endif 62 63JNIEXPORT jint JNICALL 64FileDispatcherImpl_read0(JNIEnv *env, jclass clazz, 65 jobject fdo, jlong address, jint len) 66{ 67 jint fd = fdval(env, fdo); 68 void *buf = (void *)jlong_to_ptr(address); 69 70 return convertReturnVal(env, read(fd, buf, len), JNI_TRUE); 71} 72 73JNIEXPORT jint JNICALL 74FileDispatcherImpl_pread0(JNIEnv *env, jclass clazz, jobject fdo, 75 jlong address, jint len, jlong offset) 76{ 77 jint fd = fdval(env, fdo); 78 void *buf = (void *)jlong_to_ptr(address); 79 80 return convertReturnVal(env, pread64(fd, buf, len, offset), JNI_TRUE); 81} 82 83JNIEXPORT jlong JNICALL 84FileDispatcherImpl_readv0(JNIEnv *env, jclass clazz, 85 jobject fdo, jlong address, jint len) 86{ 87 jint fd = fdval(env, fdo); 88 struct iovec *iov = (struct iovec *)jlong_to_ptr(address); 89 return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE); 90} 91 92JNIEXPORT jint JNICALL 93FileDispatcherImpl_write0(JNIEnv *env, jclass clazz, 94 jobject fdo, jlong address, jint len) 95{ 96 jint fd = fdval(env, fdo); 97 void *buf = (void *)jlong_to_ptr(address); 98 99 return convertReturnVal(env, write(fd, buf, len), JNI_FALSE); 100} 101 102JNIEXPORT jint JNICALL 103FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo, 104 jlong address, jint len, jlong offset) 105{ 106 jint fd = fdval(env, fdo); 107 void *buf = (void *)jlong_to_ptr(address); 108 109 return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE); 110} 111 112JNIEXPORT jlong JNICALL 113FileDispatcherImpl_writev0(JNIEnv *env, jclass clazz, 114 jobject fdo, jlong address, jint len) 115{ 116 jint fd = fdval(env, fdo); 117 struct iovec *iov = (struct iovec *)jlong_to_ptr(address); 118 return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE); 119} 120 121static jlong 122handle(JNIEnv *env, jlong rv, char *msg) 123{ 124 if (rv >= 0) 125 return rv; 126 if (errno == EINTR) 127 return IOS_INTERRUPTED; 128 JNU_ThrowIOExceptionWithLastError(env, msg); 129 return IOS_THROWN; 130} 131 132JNIEXPORT jint JNICALL 133FileDispatcherImpl_force0(JNIEnv *env, jobject this, 134 jobject fdo, jboolean md) 135{ 136 jint fd = fdval(env, fdo); 137 int result = 0; 138 139 if (md == JNI_FALSE) { 140 result = fdatasync(fd); 141 } else { 142#ifdef _AIX 143 /* On AIX, calling fsync on a file descriptor that is opened only for 144 * reading results in an error ("EBADF: The FileDescriptor parameter is 145 * not a valid file descriptor open for writing."). 146 * However, at this point it is not possibly anymore to read the 147 * 'writable' attribute of the corresponding file channel so we have to 148 * use 'fcntl'. 149 */ 150 int getfl = fcntl(fd, F_GETFL); 151 if (getfl >= 0 && (getfl & O_ACCMODE) == O_RDONLY) { 152 return 0; 153 } 154#endif 155 result = fsync(fd); 156 } 157 return handle(env, result, "Force failed"); 158} 159 160JNIEXPORT jint JNICALL 161FileDispatcherImpl_truncate0(JNIEnv *env, jobject this, 162 jobject fdo, jlong size) 163{ 164 return handle(env, 165 ftruncate64(fdval(env, fdo), size), 166 "Truncation failed"); 167} 168 169JNIEXPORT jlong JNICALL 170FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo) 171{ 172 jint fd = fdval(env, fdo); 173 struct stat64 fbuf; 174 175 if (fstat64(fd, &fbuf) < 0) 176 return handle(env, -1, "Size failed"); 177 178#ifdef BLKGETSIZE64 179 if (S_ISBLK(fbuf.st_mode)) { 180 uint64_t size; 181 if (ioctl(fd, BLKGETSIZE64, &size) < 0) 182 return handle(env, -1, "Size failed"); 183 return (jlong)size; 184 } 185#endif 186 187 return fbuf.st_size; 188} 189 190JNIEXPORT jint JNICALL 191FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo, 192 jboolean block, jlong pos, jlong size, 193 jboolean shared) 194{ 195 jint fd = fdval(env, fdo); 196 jint lockResult = 0; 197 int cmd = 0; 198 struct flock64 fl; 199 200 fl.l_whence = SEEK_SET; 201 if (size == (jlong)java_lang_Long_MAX_VALUE) { 202 fl.l_len = (off64_t)0; 203 } else { 204 fl.l_len = (off64_t)size; 205 } 206 fl.l_start = (off64_t)pos; 207 if (shared == JNI_TRUE) { 208 fl.l_type = F_RDLCK; 209 } else { 210 fl.l_type = F_WRLCK; 211 } 212 if (block == JNI_TRUE) { 213 cmd = F_SETLKW64; 214 } else { 215 cmd = F_SETLK64; 216 } 217 lockResult = fcntl(fd, cmd, &fl); 218 if (lockResult < 0) { 219 if ((cmd == F_SETLK64) && (errno == EAGAIN || errno == EACCES)) 220 return sun_nio_ch_FileDispatcherImpl_NO_LOCK; 221 if (errno == EINTR) 222 return sun_nio_ch_FileDispatcherImpl_INTERRUPTED; 223 JNU_ThrowIOExceptionWithLastError(env, "Lock failed"); 224 } 225 return 0; 226} 227 228JNIEXPORT void JNICALL 229FileDispatcherImpl_release0(JNIEnv *env, jobject this, 230 jobject fdo, jlong pos, jlong size) 231{ 232 jint fd = fdval(env, fdo); 233 jint lockResult = 0; 234 struct flock64 fl; 235 int cmd = F_SETLK64; 236 237 fl.l_whence = SEEK_SET; 238 if (size == (jlong)java_lang_Long_MAX_VALUE) { 239 fl.l_len = (off64_t)0; 240 } else { 241 fl.l_len = (off64_t)size; 242 } 243 fl.l_start = (off64_t)pos; 244 fl.l_type = F_UNLCK; 245 lockResult = fcntl(fd, cmd, &fl); 246 if (lockResult < 0) { 247 JNU_ThrowIOExceptionWithLastError(env, "Release failed"); 248 } 249} 250 251 252static void closeFileDescriptor(JNIEnv *env, int fd) { 253 if (fd != -1) { 254 int result = close(fd); 255 if (result < 0) 256 JNU_ThrowIOExceptionWithLastError(env, "Close failed"); 257 } 258} 259 260JNIEXPORT void JNICALL 261FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo) 262{ 263 jint fd = fdval(env, fdo); 264 closeFileDescriptor(env, fd); 265} 266 267JNIEXPORT void JNICALL 268FileDispatcherImpl_preClose0(JNIEnv *env, jclass clazz, jobject fdo) 269{ 270 jint fd = fdval(env, fdo); 271 int preCloseFD = open("/dev/null", O_RDWR | O_CLOEXEC); 272 if (preCloseFD < 0) { 273 JNU_ThrowIOExceptionWithLastError(env, "open(\"/dev/null\") failed"); 274 return; 275 } 276 if (dup2(preCloseFD, fd) < 0) { 277 JNU_ThrowIOExceptionWithLastError(env, "dup2 failed"); 278 } 279 close(preCloseFD); 280} 281 282JNIEXPORT void JNICALL 283FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd) 284{ 285 closeFileDescriptor(env, fd); 286} 287 288static JNINativeMethod gMethods[] = { 289 NATIVE_METHOD(FileDispatcherImpl, closeIntFD, "(I)V"), 290 NATIVE_METHOD(FileDispatcherImpl, preClose0, "(Ljava/io/FileDescriptor;)V"), 291 NATIVE_METHOD(FileDispatcherImpl, close0, "(Ljava/io/FileDescriptor;)V"), 292 NATIVE_METHOD(FileDispatcherImpl, release0, "(Ljava/io/FileDescriptor;JJ)V"), 293 NATIVE_METHOD(FileDispatcherImpl, lock0, "(Ljava/io/FileDescriptor;ZJJZ)I"), 294 NATIVE_METHOD(FileDispatcherImpl, size0, "(Ljava/io/FileDescriptor;)J"), 295 NATIVE_METHOD(FileDispatcherImpl, truncate0, "(Ljava/io/FileDescriptor;J)I"), 296 NATIVE_METHOD(FileDispatcherImpl, force0, "(Ljava/io/FileDescriptor;Z)I"), 297 NATIVE_METHOD(FileDispatcherImpl, writev0, "(Ljava/io/FileDescriptor;JI)J"), 298 NATIVE_METHOD(FileDispatcherImpl, pwrite0, "(Ljava/io/FileDescriptor;JIJ)I"), 299 NATIVE_METHOD(FileDispatcherImpl, write0, "(Ljava/io/FileDescriptor;JI)I"), 300 NATIVE_METHOD(FileDispatcherImpl, readv0, "(Ljava/io/FileDescriptor;JI)J"), 301 NATIVE_METHOD(FileDispatcherImpl, pread0, "(Ljava/io/FileDescriptor;JIJ)I"), 302 NATIVE_METHOD(FileDispatcherImpl, read0, "(Ljava/io/FileDescriptor;JI)I"), 303}; 304 305void register_sun_nio_ch_FileDispatcherImpl(JNIEnv* env) { 306 jniRegisterNativeMethods(env, "sun/nio/ch/FileDispatcherImpl", gMethods, NELEM(gMethods)); 307} 308