1 /*
2 * Copyright (c) 2000, 2011, 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 "jvm_md.h"
30 #include "jlong.h"
31 #include <sys/mman.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include "sun_nio_ch_FileChannelImpl.h"
35 #include "nio.h"
36 #include "nio_util.h"
37 #include <dlfcn.h>
38 #include <nativehelper/JNIHelp.h>
39
40 #define NATIVE_METHOD(className, functionName, signature) \
41 { #functionName, signature, (void*)(className ## _ ## functionName) }
42
43 #if defined(__linux__) || defined(__solaris__)
44 #include <sys/sendfile.h>
45 #elif defined(_AIX)
46 #include <sys/socket.h>
47 #elif defined(_ALLBSD_SOURCE)
48 #include <sys/types.h>
49 #include <sys/socket.h>
50 #include <sys/uio.h>
51
52 #define lseek64 lseek
53 #define mmap64 mmap
54 // BEGIN Android-added: Alias *64 on Fuchsia builds. http://b/119496969
55 #elif defined(__Fuchsia__)
56 #define lseek64 lseek
57 #define mmap64 mmap
58 // END Android-added: Alias *64 on Fuchsia builds. http://b/119496969
59 #endif
60
61 static jfieldID chan_fd; /* jobject 'fd' in sun.io.FileChannelImpl */
62
63 JNIEXPORT jlong JNICALL
FileChannelImpl_initIDs(JNIEnv * env,jclass clazz)64 FileChannelImpl_initIDs(JNIEnv *env, jclass clazz)
65 {
66 jlong pageSize = sysconf(_SC_PAGESIZE);
67 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;");
68 return pageSize;
69 }
70
71 static jlong
handle(JNIEnv * env,jlong rv,char * msg)72 handle(JNIEnv *env, jlong rv, char *msg)
73 {
74 if (rv >= 0)
75 return rv;
76 if (errno == EINTR)
77 return IOS_INTERRUPTED;
78 JNU_ThrowIOExceptionWithLastError(env, msg);
79 return IOS_THROWN;
80 }
81
82
83 JNIEXPORT jlong JNICALL
FileChannelImpl_map0(JNIEnv * env,jobject this,jint prot,jlong off,jlong len)84 FileChannelImpl_map0(JNIEnv *env, jobject this,
85 jint prot, jlong off, jlong len)
86 {
87 void *mapAddress = 0;
88 jobject fdo = (*env)->GetObjectField(env, this, chan_fd);
89 jint fd = fdval(env, fdo);
90 int protections = 0;
91 int flags = 0;
92
93 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
94 protections = PROT_READ;
95 flags = MAP_SHARED;
96 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
97 protections = PROT_WRITE | PROT_READ;
98 flags = MAP_SHARED;
99 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
100 protections = PROT_WRITE | PROT_READ;
101 flags = MAP_PRIVATE;
102 }
103
104 mapAddress = mmap64(
105 0, /* Let OS decide location */
106 len, /* Number of bytes to map */
107 protections, /* File permissions */
108 flags, /* Changes are shared */
109 fd, /* File descriptor of mapped file */
110 off); /* Offset into file */
111
112 if (mapAddress == MAP_FAILED) {
113 if (errno == ENOMEM) {
114 JNU_ThrowOutOfMemoryError(env, "Map failed");
115 return IOS_THROWN;
116 }
117 return handle(env, -1, "Map failed");
118 }
119
120 return ((jlong) (unsigned long) mapAddress);
121 }
122
123
124 JNIEXPORT jint JNICALL
FileChannelImpl_unmap0(JNIEnv * env,jobject this,jlong address,jlong len)125 FileChannelImpl_unmap0(JNIEnv *env, jobject this,
126 jlong address, jlong len)
127 {
128 void *a = (void *)jlong_to_ptr(address);
129 return handle(env,
130 munmap(a, (size_t)len),
131 "Unmap failed");
132 }
133
134
135 JNIEXPORT jlong JNICALL
FileChannelImpl_position0(JNIEnv * env,jobject this,jobject fdo,jlong offset)136 FileChannelImpl_position0(JNIEnv *env, jobject this,
137 jobject fdo, jlong offset)
138 {
139 jint fd = fdval(env, fdo);
140 jlong result = 0;
141
142 if (offset < 0) {
143 result = lseek64(fd, 0, SEEK_CUR);
144 } else {
145 result = lseek64(fd, offset, SEEK_SET);
146 }
147 return handle(env, result, "Position failed");
148 }
149
150
151 JNIEXPORT void JNICALL
FileChannelImpl_close0(JNIEnv * env,jobject this,jobject fdo)152 FileChannelImpl_close0(JNIEnv *env, jobject this, jobject fdo)
153 {
154 jint fd = fdval(env, fdo);
155 if (fd != -1) {
156 jlong result = close(fd);
157 if (result < 0) {
158 JNU_ThrowIOExceptionWithLastError(env, "Close failed");
159 }
160 }
161 }
162
163 JNIEXPORT jlong JNICALL
FileChannelImpl_transferTo0(JNIEnv * env,jobject this,jobject srcFDO,jlong position,jlong count,jobject dstFDO)164 FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
165 jobject srcFDO,
166 jlong position, jlong count,
167 jobject dstFDO)
168 {
169 jint srcFD = fdval(env, srcFDO);
170 jint dstFD = fdval(env, dstFDO);
171
172 #if defined(__linux__)
173 off64_t offset = (off64_t)position;
174 jlong n = sendfile64(dstFD, srcFD, &offset, (size_t)count);
175 if (n < 0) {
176 if (errno == EAGAIN)
177 return IOS_UNAVAILABLE;
178 if ((errno == EINVAL) && ((ssize_t)count >= 0))
179 return IOS_UNSUPPORTED_CASE;
180 if (errno == EINTR) {
181 return IOS_INTERRUPTED;
182 }
183 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
184 return IOS_THROWN;
185 }
186 return n;
187 #elif defined (__solaris__)
188 sendfilevec64_t sfv;
189 size_t numBytes = 0;
190 jlong result;
191
192 sfv.sfv_fd = srcFD;
193 sfv.sfv_flag = 0;
194 sfv.sfv_off = (off64_t)position;
195 sfv.sfv_len = count;
196
197 result = sendfilev64(dstFD, &sfv, 1, &numBytes);
198
199 /* Solaris sendfilev() will return -1 even if some bytes have been
200 * transferred, so we check numBytes first.
201 */
202 if (numBytes > 0)
203 return numBytes;
204 if (result < 0) {
205 if (errno == EAGAIN)
206 return IOS_UNAVAILABLE;
207 if (errno == EOPNOTSUPP)
208 return IOS_UNSUPPORTED_CASE;
209 if ((errno == EINVAL) && ((ssize_t)count >= 0))
210 return IOS_UNSUPPORTED_CASE;
211 if (errno == EINTR)
212 return IOS_INTERRUPTED;
213 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
214 return IOS_THROWN;
215 }
216 return result;
217 #elif defined(__APPLE__)
218 off_t numBytes;
219 int result;
220
221 numBytes = count;
222
223 result = sendfile(srcFD, dstFD, position, &numBytes, NULL, 0);
224
225 if (numBytes > 0)
226 return numBytes;
227
228 if (result == -1) {
229 if (errno == EAGAIN)
230 return IOS_UNAVAILABLE;
231 if (errno == EOPNOTSUPP || errno == ENOTSOCK || errno == ENOTCONN)
232 return IOS_UNSUPPORTED_CASE;
233 if ((errno == EINVAL) && ((ssize_t)count >= 0))
234 return IOS_UNSUPPORTED_CASE;
235 if (errno == EINTR)
236 return IOS_INTERRUPTED;
237 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
238 return IOS_THROWN;
239 }
240
241 return result;
242
243 #elif defined(_AIX)
244 jlong max = (jlong)java_lang_Integer_MAX_VALUE;
245 struct sf_parms sf_iobuf;
246 jlong result;
247
248 if (position > max)
249 return IOS_UNSUPPORTED_CASE;
250
251 if (count > max)
252 count = max;
253
254 memset(&sf_iobuf, 0, sizeof(sf_iobuf));
255 sf_iobuf.file_descriptor = srcFD;
256 sf_iobuf.file_offset = (off_t)position;
257 sf_iobuf.file_bytes = count;
258
259 result = send_file(&dstFD, &sf_iobuf, SF_SYNC_CACHE);
260
261 /* AIX send_file() will return 0 when this operation complete successfully,
262 * return 1 when partial bytes transfered and return -1 when an error has
263 * Occured.
264 */
265 if (result == -1) {
266 if (errno == EWOULDBLOCK)
267 return IOS_UNAVAILABLE;
268 if ((errno == EINVAL) && ((ssize_t)count >= 0))
269 return IOS_UNSUPPORTED_CASE;
270 if (errno == EINTR)
271 return IOS_INTERRUPTED;
272 if (errno == ENOTSOCK)
273 return IOS_UNSUPPORTED;
274 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
275 return IOS_THROWN;
276 }
277
278 if (sf_iobuf.bytes_sent > 0)
279 return (jlong)sf_iobuf.bytes_sent;
280
281 return IOS_UNSUPPORTED_CASE;
282 #else
283 return IOS_UNSUPPORTED_CASE;
284 #endif
285 }
286
287 static JNINativeMethod gMethods[] = {
288 NATIVE_METHOD(FileChannelImpl, initIDs, "()J"),
289 NATIVE_METHOD(FileChannelImpl, map0, "(IJJ)J"),
290 NATIVE_METHOD(FileChannelImpl, unmap0, "(JJ)I"),
291 NATIVE_METHOD(FileChannelImpl, position0, "(Ljava/io/FileDescriptor;J)J"),
292 NATIVE_METHOD(FileChannelImpl, transferTo0, "(Ljava/io/FileDescriptor;JJLjava/io/FileDescriptor;)J"),
293 };
294
register_sun_nio_ch_FileChannelImpl(JNIEnv * env)295 void register_sun_nio_ch_FileChannelImpl(JNIEnv* env) {
296 jniRegisterNativeMethods(env, "sun/nio/ch/FileChannelImpl", gMethods, NELEM(gMethods));
297 }
298