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 "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(_ALLBSD_SOURCE)
46 #include <sys/types.h>
47 #include <sys/socket.h>
48 #include <sys/uio.h>
49
50 #define lseek64 lseek
51 #define mmap64 mmap
52 #endif
53
54 static jfieldID chan_fd; /* jobject 'fd' in sun.io.FileChannelImpl */
55
56 JNIEXPORT jlong JNICALL
FileChannelImpl_initIDs(JNIEnv * env,jclass clazz)57 FileChannelImpl_initIDs(JNIEnv *env, jclass clazz)
58 {
59 jlong pageSize = sysconf(_SC_PAGESIZE);
60 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;");
61 return pageSize;
62 }
63
64 static jlong
handle(JNIEnv * env,jlong rv,char * msg)65 handle(JNIEnv *env, jlong rv, char *msg)
66 {
67 if (rv >= 0)
68 return rv;
69 if (errno == EINTR)
70 return IOS_INTERRUPTED;
71 JNU_ThrowIOExceptionWithLastError(env, msg);
72 return IOS_THROWN;
73 }
74
75
76 JNIEXPORT jlong JNICALL
FileChannelImpl_map0(JNIEnv * env,jobject this,jint prot,jlong off,jlong len)77 FileChannelImpl_map0(JNIEnv *env, jobject this,
78 jint prot, jlong off, jlong len)
79 {
80 void *mapAddress = 0;
81 jobject fdo = (*env)->GetObjectField(env, this, chan_fd);
82 jint fd = fdval(env, fdo);
83 int protections = 0;
84 int flags = 0;
85
86 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
87 protections = PROT_READ;
88 flags = MAP_SHARED;
89 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
90 protections = PROT_WRITE | PROT_READ;
91 flags = MAP_SHARED;
92 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
93 protections = PROT_WRITE | PROT_READ;
94 flags = MAP_PRIVATE;
95 }
96
97 mapAddress = mmap64(
98 0, /* Let OS decide location */
99 len, /* Number of bytes to map */
100 protections, /* File permissions */
101 flags, /* Changes are shared */
102 fd, /* File descriptor of mapped file */
103 off); /* Offset into file */
104
105 if (mapAddress == MAP_FAILED) {
106 if (errno == ENOMEM) {
107 JNU_ThrowOutOfMemoryError(env, "Map failed");
108 return IOS_THROWN;
109 }
110 return handle(env, -1, "Map failed");
111 }
112
113 return ((jlong) (unsigned long) mapAddress);
114 }
115
116
117 JNIEXPORT jint JNICALL
FileChannelImpl_unmap0(JNIEnv * env,jobject this,jlong address,jlong len)118 FileChannelImpl_unmap0(JNIEnv *env, jobject this,
119 jlong address, jlong len)
120 {
121 void *a = (void *)jlong_to_ptr(address);
122 return handle(env,
123 munmap(a, (size_t)len),
124 "Unmap failed");
125 }
126
127
128 JNIEXPORT jlong JNICALL
FileChannelImpl_position0(JNIEnv * env,jobject this,jobject fdo,jlong offset)129 FileChannelImpl_position0(JNIEnv *env, jobject this,
130 jobject fdo, jlong offset)
131 {
132 jint fd = fdval(env, fdo);
133 jlong result = 0;
134
135 if (offset < 0) {
136 result = lseek64(fd, 0, SEEK_CUR);
137 } else {
138 result = lseek64(fd, offset, SEEK_SET);
139 }
140 return handle(env, result, "Position failed");
141 }
142
143
144 JNIEXPORT void JNICALL
FileChannelImpl_close0(JNIEnv * env,jobject this,jobject fdo)145 FileChannelImpl_close0(JNIEnv *env, jobject this, jobject fdo)
146 {
147 jint fd = fdval(env, fdo);
148 if (fd != -1) {
149 jlong result = close(fd);
150 if (result < 0) {
151 JNU_ThrowIOExceptionWithLastError(env, "Close failed");
152 }
153 }
154 }
155
156 JNIEXPORT jlong JNICALL
FileChannelImpl_transferTo0(JNIEnv * env,jobject this,jint srcFD,jlong position,jlong count,jint dstFD)157 FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
158 jint srcFD,
159 jlong position, jlong count,
160 jint dstFD)
161 {
162 #if defined(__linux__)
163 off64_t offset = (off64_t)position;
164 jlong n = sendfile64(dstFD, srcFD, &offset, (size_t)count);
165 if (n < 0) {
166 if (errno == EAGAIN)
167 return IOS_UNAVAILABLE;
168 if ((errno == EINVAL) && ((ssize_t)count >= 0))
169 return IOS_UNSUPPORTED_CASE;
170 if (errno == EINTR) {
171 return IOS_INTERRUPTED;
172 }
173 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
174 return IOS_THROWN;
175 }
176 return n;
177 #elif defined (__solaris__)
178 sendfilevec64_t sfv;
179 size_t numBytes = 0;
180 jlong result;
181
182 sfv.sfv_fd = srcFD;
183 sfv.sfv_flag = 0;
184 sfv.sfv_off = (off64_t)position;
185 sfv.sfv_len = count;
186
187 result = sendfilev64(dstFD, &sfv, 1, &numBytes);
188
189 /* Solaris sendfilev() will return -1 even if some bytes have been
190 * transferred, so we check numBytes first.
191 */
192 if (numBytes > 0)
193 return numBytes;
194 if (result < 0) {
195 if (errno == EAGAIN)
196 return IOS_UNAVAILABLE;
197 if (errno == EOPNOTSUPP)
198 return IOS_UNSUPPORTED_CASE;
199 if ((errno == EINVAL) && ((ssize_t)count >= 0))
200 return IOS_UNSUPPORTED_CASE;
201 if (errno == EINTR)
202 return IOS_INTERRUPTED;
203 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
204 return IOS_THROWN;
205 }
206 return result;
207 #elif defined(__APPLE__)
208 off_t numBytes;
209 int result;
210
211 numBytes = count;
212
213 #ifdef __APPLE__
214 result = sendfile(srcFD, dstFD, position, &numBytes, NULL, 0);
215 #endif
216
217 if (numBytes > 0)
218 return numBytes;
219
220 if (result == -1) {
221 if (errno == EAGAIN)
222 return IOS_UNAVAILABLE;
223 if (errno == EOPNOTSUPP || errno == ENOTSOCK || errno == ENOTCONN)
224 return IOS_UNSUPPORTED_CASE;
225 if ((errno == EINVAL) && ((ssize_t)count >= 0))
226 return IOS_UNSUPPORTED_CASE;
227 if (errno == EINTR)
228 return IOS_INTERRUPTED;
229 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
230 return IOS_THROWN;
231 }
232
233 return result;
234 #else
235 return IOS_UNSUPPORTED_CASE;
236 #endif
237 }
238
239 static JNINativeMethod gMethods[] = {
240 NATIVE_METHOD(FileChannelImpl, initIDs, "()J"),
241 NATIVE_METHOD(FileChannelImpl, map0, "(IJJ)J"),
242 NATIVE_METHOD(FileChannelImpl, unmap0, "(JJ)I"),
243 NATIVE_METHOD(FileChannelImpl, position0, "(Ljava/io/FileDescriptor;J)J"),
244 NATIVE_METHOD(FileChannelImpl, transferTo0, "(IJJI)J"),
245 };
246
register_sun_nio_ch_FileChannelImpl(JNIEnv * env)247 void register_sun_nio_ch_FileChannelImpl(JNIEnv* env) {
248 jniRegisterNativeMethods(env, "sun/nio/ch/FileChannelImpl", gMethods, NELEM(gMethods));
249 }
250