1 /*
2 * Copyright (c) 2000, 2017, 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 "java_lang_Integer.h"
36 #include "nio.h"
37 #include "nio_util.h"
38 #include <dlfcn.h>
39
40 #if defined(__linux__) || defined(__solaris__)
41 #include <sys/sendfile.h>
42 #elif defined(_AIX)
43 #include <sys/socket.h>
44 #elif defined(_ALLBSD_SOURCE)
45 #include <sys/types.h>
46 #include <sys/socket.h>
47 #include <sys/uio.h>
48
49 #define lseek64 lseek
50 #define mmap64 mmap
51 #endif
52
53 static jfieldID chan_fd; /* jobject 'fd' in sun.io.FileChannelImpl */
54
55 JNIEXPORT jlong JNICALL
56 Java_sun_nio_ch_FileChannelImpl_initIDs(JNIEnv *env, jclass clazz)
57 {
58 jlong pageSize = sysconf(_SC_PAGESIZE);
59 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;");
60 return pageSize;
61 }
62
63 static jlong
64 handle(JNIEnv *env, jlong rv, char *msg)
65 {
66 if (rv >= 0)
67 return rv;
68 if (errno == EINTR)
69 return IOS_INTERRUPTED;
70 JNU_ThrowIOExceptionWithLastError(env, msg);
71 return IOS_THROWN;
72 }
73
74
75 JNIEXPORT jlong JNICALL
76 Java_sun_nio_ch_FileChannelImpl_map0(JNIEnv *env, jobject this,
77 jint prot, jlong off, jlong len)
78 {
79 void *mapAddress = 0;
80 jobject fdo = (*env)->GetObjectField(env, this, chan_fd);
81 jint fd = fdval(env, fdo);
82 int protections = 0;
83 int flags = 0;
84
85 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
86 protections = PROT_READ;
87 flags = MAP_SHARED;
88 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
89 protections = PROT_WRITE | PROT_READ;
90 flags = MAP_SHARED;
91 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
92 protections = PROT_WRITE | PROT_READ;
93 flags = MAP_PRIVATE;
94 }
95
96 mapAddress = mmap64(
97 0, /* Let OS decide location */
98 len, /* Number of bytes to map */
99 protections, /* File permissions */
100 flags, /* Changes are shared */
101 fd, /* File descriptor of mapped file */
102 off); /* Offset into file */
103
104 if (mapAddress == MAP_FAILED) {
105 if (errno == ENOMEM) {
106 JNU_ThrowOutOfMemoryError(env, "Map failed");
107 return IOS_THROWN;
108 }
109 return handle(env, -1, "Map failed");
110 }
111
112 return ((jlong) (unsigned long) mapAddress);
113 }
114
115
116 JNIEXPORT jint JNICALL
117 Java_sun_nio_ch_FileChannelImpl_unmap0(JNIEnv *env, jobject this,
118 jlong address, jlong len)
119 {
120 void *a = (void *)jlong_to_ptr(address);
121 return handle(env,
122 munmap(a, (size_t)len),
123 "Unmap failed");
124 }
125
126
127 JNIEXPORT jlong JNICALL
128 Java_sun_nio_ch_FileChannelImpl_position0(JNIEnv *env, jobject this,
129 jobject fdo, jlong offset)
130 {
131 jint fd = fdval(env, fdo);
132 jlong result = 0;
133
134 if (offset < 0) {
135 result = lseek64(fd, 0, SEEK_CUR);
136 } else {
137 result = lseek64(fd, offset, SEEK_SET);
138 }
139 return handle(env, result, "Position failed");
140 }
141
142
143 JNIEXPORT jlong JNICALL
144 Java_sun_nio_ch_FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
145 jobject srcFDO,
146 jlong position, jlong count,
147 jobject dstFDO)
148 {
149 jint srcFD = fdval(env, srcFDO);
150 jint dstFD = fdval(env, dstFDO);
151
152 #if defined(__linux__)
153 off64_t offset = (off64_t)position;
154 jlong n = sendfile64(dstFD, srcFD, &offset, (size_t)count);
155 if (n < 0) {
156 if (errno == EAGAIN)
157 return IOS_UNAVAILABLE;
158 if ((errno == EINVAL) && ((ssize_t)count >= 0))
159 return IOS_UNSUPPORTED_CASE;
160 if (errno == EINTR) {
161 return IOS_INTERRUPTED;
162 }
163 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
164 return IOS_THROWN;
165 }
166 return n;
167 #elif defined (__solaris__)
168 sendfilevec64_t sfv;
169 size_t numBytes = 0;
170 jlong result;
171
172 sfv.sfv_fd = srcFD;
173 sfv.sfv_flag = 0;
174 sfv.sfv_off = (off64_t)position;
175 sfv.sfv_len = count;
176
177 result = sendfilev64(dstFD, &sfv, 1, &numBytes);
178
179 /* Solaris sendfilev() will return -1 even if some bytes have been
180 * transferred, so we check numBytes first.
181 */
182 if (numBytes > 0)
183 return numBytes;
184 if (result < 0) {
185 if (errno == EAGAIN)
186 return IOS_UNAVAILABLE;
187 if (errno == EOPNOTSUPP)
188 return IOS_UNSUPPORTED_CASE;
189 if ((errno == EINVAL) && ((ssize_t)count >= 0))
190 return IOS_UNSUPPORTED_CASE;
191 if (errno == EINTR)
192 return IOS_INTERRUPTED;
193 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
194 return IOS_THROWN;
195 }
196 return result;
197 #elif defined(__APPLE__)
198 off_t numBytes;
199 int result;
200
201 numBytes = count;
202
203 result = sendfile(srcFD, dstFD, position, &numBytes, NULL, 0);
204
205 if (numBytes > 0)
206 return numBytes;
207
208 if (result == -1) {
209 if (errno == EAGAIN)
210 return IOS_UNAVAILABLE;
211 if (errno == EOPNOTSUPP || errno == ENOTSOCK || errno == ENOTCONN)
212 return IOS_UNSUPPORTED_CASE;
213 if ((errno == EINVAL) && ((ssize_t)count >= 0))
214 return IOS_UNSUPPORTED_CASE;
215 if (errno == EINTR)
216 return IOS_INTERRUPTED;
217 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
218 return IOS_THROWN;
219 }
220
221 return result;
222
223 #elif defined(_AIX)
224 jlong max = (jlong)java_lang_Integer_MAX_VALUE;
225 struct sf_parms sf_iobuf;
226 jlong result;
227
228 if (position > max)
229 return IOS_UNSUPPORTED_CASE;
230
231 if (count > max)
232 count = max;
233
234 memset(&sf_iobuf, 0, sizeof(sf_iobuf));
235 sf_iobuf.file_descriptor = srcFD;
236 sf_iobuf.file_offset = (off_t)position;
237 sf_iobuf.file_bytes = count;
238
239 result = send_file(&dstFD, &sf_iobuf, SF_SYNC_CACHE);
240
241 /* AIX send_file() will return 0 when this operation complete successfully,
242 * return 1 when partial bytes transfered and return -1 when an error has
243 * Occured.
244 */
245 if (result == -1) {
246 if (errno == EWOULDBLOCK)
247 return IOS_UNAVAILABLE;
248 if ((errno == EINVAL) && ((ssize_t)count >= 0))
249 return IOS_UNSUPPORTED_CASE;
250 if (errno == EINTR)
251 return IOS_INTERRUPTED;
252 if (errno == ENOTSOCK)
253 return IOS_UNSUPPORTED;
254 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
255 return IOS_THROWN;
256 }
257
258 if (sf_iobuf.bytes_sent > 0)
259 return (jlong)sf_iobuf.bytes_sent;
260
261 return IOS_UNSUPPORTED_CASE;
262 #else
263 return IOS_UNSUPPORTED_CASE;
264 #endif
265 }
266