1 /*
2 * Copyright (c) 2000, 2018, 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 <sys/socket.h>
36 #elif defined(_ALLBSD_SOURCE)
37 #include <sys/socket.h>
38 #include <sys/uio.h>
39 #define lseek64 lseek
40 #define mmap64 mmap
41 #endif
42
43 #include "jni.h"
44 #include "jni_util.h"
45 #include "jlong.h"
46 #include "nio.h"
47 #include "nio_util.h"
48 #include "sun_nio_ch_FileChannelImpl.h"
49 #include "java_lang_Integer.h"
50 #include <assert.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, jboolean map_sync)
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 // should never be called with map_sync and prot == PRIVATE
85 assert((prot != sun_nio_ch_FileChannelImpl_MAP_PV) ||! map_sync);
86
87 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
88 protections = PROT_READ;
89 flags = MAP_SHARED;
90 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
91 protections = PROT_WRITE | PROT_READ;
92 flags = MAP_SHARED;
93 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
94 protections = PROT_WRITE | PROT_READ;
95 flags = MAP_PRIVATE;
96 }
97
98 // TODO - remove the following defines
99 // for testing we need to define the extra MAP_XXX flags used for
100 // persistent memory. they will eventually get defined by the
101 // system and included via sys/mman.h
102
103 #ifndef MAP_SYNC
104 #define MAP_SYNC 0x80000
105 #define MAP_SHARED_VALIDATE 0x03;
106 #define __NEEDS_MAP_SYNC_UNDEF__
107 #endif
108
109 if (map_sync) {
110 // ensure
111 // 1) this is Linux on AArch64 or x86_64
112 // 2) the mmap APIs are available/ at compile time
113 #if !defined(LINUX) || ! (defined(aarch64) || (defined(amd64) && defined(_LP64))) || ! defined(MAP_SYNC) || ! defined(MAP_SHARED_VALIDATE)
114 // TODO - implement for solaris/AIX/BSD/WINDOWS and for 32 bit
115 JNU_ThrowIOException(env, "map_persistent is not implemented");
116 return IOS_THROWN;
117 #else
118 flags |= MAP_SYNC | MAP_SHARED_VALIDATE;
119 #endif
120 }
121
122 #ifdef __NEEDS_MAP_SYNC_UNDEF__
123 #undef MAP_SYNC
124 #undef MAP_SHARED_VALIDATE
125 #undef __NEEDS_MAP_SYNC_UNDEF__
126 #endif
127
128 mapAddress = mmap64(
129 0, /* Let OS decide location */
130 len, /* Number of bytes to map */
131 protections, /* File permissions */
132 flags, /* Changes are shared */
133 fd, /* File descriptor of mapped file */
134 off); /* Offset into file */
135
136 if (mapAddress == MAP_FAILED) {
137 if (map_sync && errno == ENOTSUP) {
138 JNU_ThrowIOExceptionWithLastError(env, "map_persistent is not supported");
139 return IOS_THROWN;
140 }
141
142 if (errno == ENOMEM) {
143 JNU_ThrowOutOfMemoryError(env, "Map failed");
144 return IOS_THROWN;
145 }
146 return handle(env, -1, "Map failed");
147 }
148
149 return ((jlong) (unsigned long) mapAddress);
150 }
151
152
153 JNIEXPORT jint JNICALL
154 Java_sun_nio_ch_FileChannelImpl_unmap0(JNIEnv *env, jobject this,
155 jlong address, jlong len)
156 {
157 void *a = (void *)jlong_to_ptr(address);
158 return handle(env,
159 munmap(a, (size_t)len),
160 "Unmap failed");
161 }
162
163 JNIEXPORT jlong JNICALL
164 Java_sun_nio_ch_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