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 <nativehelper/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
63 JNIEXPORT jint JNICALL
FileDispatcherImpl_read0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)64 FileDispatcherImpl_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
73 JNIEXPORT jint JNICALL
FileDispatcherImpl_pread0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len,jlong offset)74 FileDispatcherImpl_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
83 JNIEXPORT jlong JNICALL
FileDispatcherImpl_readv0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)84 FileDispatcherImpl_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
92 JNIEXPORT jint JNICALL
FileDispatcherImpl_write0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)93 FileDispatcherImpl_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
102 JNIEXPORT jint JNICALL
FileDispatcherImpl_pwrite0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len,jlong offset)103 FileDispatcherImpl_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
112 JNIEXPORT jlong JNICALL
FileDispatcherImpl_writev0(JNIEnv * env,jclass clazz,jobject fdo,jlong address,jint len)113 FileDispatcherImpl_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
121 static jlong
handle(JNIEnv * env,jlong rv,char * msg)122 handle(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
132 JNIEXPORT jint JNICALL
FileDispatcherImpl_force0(JNIEnv * env,jobject this,jobject fdo,jboolean md)133 FileDispatcherImpl_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
160 JNIEXPORT jint JNICALL
FileDispatcherImpl_truncate0(JNIEnv * env,jobject this,jobject fdo,jlong size)161 FileDispatcherImpl_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
169 JNIEXPORT jlong JNICALL
FileDispatcherImpl_size0(JNIEnv * env,jobject this,jobject fdo)170 FileDispatcherImpl_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
190 JNIEXPORT jint JNICALL
FileDispatcherImpl_lock0(JNIEnv * env,jobject this,jobject fdo,jboolean block,jlong pos,jlong size,jboolean shared)191 FileDispatcherImpl_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
228 JNIEXPORT void JNICALL
FileDispatcherImpl_release0(JNIEnv * env,jobject this,jobject fdo,jlong pos,jlong size)229 FileDispatcherImpl_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
closeFileDescriptor(JNIEnv * env,int fd)252 static 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
260 JNIEXPORT void JNICALL
FileDispatcherImpl_close0(JNIEnv * env,jclass clazz,jobject fdo)261 FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo)
262 {
263 jint fd = fdval(env, fdo);
264 closeFileDescriptor(env, fd);
265 }
266
267 JNIEXPORT void JNICALL
FileDispatcherImpl_preClose0(JNIEnv * env,jclass clazz,jobject fdo)268 FileDispatcherImpl_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
282 JNIEXPORT void JNICALL
FileDispatcherImpl_closeIntFD(JNIEnv * env,jclass clazz,jint fd)283 FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd)
284 {
285 closeFileDescriptor(env, fd);
286 }
287
288 static 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
register_sun_nio_ch_FileDispatcherImpl(JNIEnv * env)305 void register_sun_nio_ch_FileDispatcherImpl(JNIEnv* env) {
306 jniRegisterNativeMethods(env, "sun/nio/ch/FileDispatcherImpl", gMethods, NELEM(gMethods));
307 }
308