1 /*
2 * Copyright (c) 2000, 2009, 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 <sys/mman.h>
31 #include <sys/stat.h>
32 #include "sun_nio_ch_FileChannelImpl.h"
33 #include "java_lang_Integer.h"
34 #include "nio.h"
35 #include "nio_util.h"
36 #include <dlfcn.h>
37
38 static jfieldID chan_fd; /* jobject 'fd' in sun.io.FileChannelImpl */
39
40 #ifdef __solaris__
41 typedef struct sendfilevec64 {
42 int sfv_fd; /* input fd */
43 uint_t sfv_flag; /* Flags. see below */
44 off64_t sfv_off; /* offset to start reading from */
45 size_t sfv_len; /* amount of data */
46 } sendfilevec_t;
47
48 /* Function pointer for sendfilev on Solaris 8+ */
49 typedef ssize_t sendfile_func(int fildes, const struct sendfilevec64 *vec,
50 int sfvcnt, size_t *xferred);
51
52 sendfile_func* my_sendfile_func = NULL;
53 #endif
54
55 #ifdef __linux__
56 #include <sys/sendfile.h>
57
58 /* Function pointer for sendfile64 on Linux 2.6 (and newer 2.4 kernels) */
59 typedef ssize_t sendfile64_func(int out_fd, int in_fd, off64_t *offset, size_t count);
60
61 sendfile64_func* my_sendfile64_func = NULL;
62 #endif
63
64 JNIEXPORT jlong JNICALL
65 Java_sun_nio_ch_FileChannelImpl_initIDs(JNIEnv *env, jclass clazz)
66 {
67 jlong pageSize = sysconf(_SC_PAGESIZE);
68 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;");
69
70 #ifdef __solaris__
71 if (dlopen("/usr/lib/libsendfile.so.1", RTLD_GLOBAL | RTLD_LAZY) != NULL) {
72 my_sendfile_func = (sendfile_func*) dlsym(RTLD_DEFAULT, "sendfilev64");
73 }
74 #endif
75
76 #ifdef __linux__
77 my_sendfile64_func = (sendfile64_func*) dlsym(RTLD_DEFAULT, "sendfile64");
78 #endif
79
80 return pageSize;
81 }
82
83 static jlong
84 handle(JNIEnv *env, jlong rv, char *msg)
85 {
86 if (rv >= 0)
87 return rv;
88 if (errno == EINTR)
89 return IOS_INTERRUPTED;
90 JNU_ThrowIOExceptionWithLastError(env, msg);
91 return IOS_THROWN;
92 }
93
94
95 JNIEXPORT jlong JNICALL
96 Java_sun_nio_ch_FileChannelImpl_map0(JNIEnv *env, jobject this,
97 jint prot, jlong off, jlong len)
98 {
99 void *mapAddress = 0;
100 jobject fdo = (*env)->GetObjectField(env, this, chan_fd);
101 jint fd = fdval(env, fdo);
102 int protections = 0;
103 int flags = 0;
104
105 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
106 protections = PROT_READ;
107 flags = MAP_SHARED;
108 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
109 protections = PROT_WRITE | PROT_READ;
110 flags = MAP_SHARED;
111 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
112 protections = PROT_WRITE | PROT_READ;
113 flags = MAP_PRIVATE;
114 }
115
116 mapAddress = mmap64(
117 0, /* Let OS decide location */
118 len, /* Number of bytes to map */
119 protections, /* File permissions */
120 flags, /* Changes are shared */
121 fd, /* File descriptor of mapped file */
122 off); /* Offset into file */
123
124 if (mapAddress == MAP_FAILED) {
125 if (errno == ENOMEM) {
126 JNU_ThrowOutOfMemoryError(env, "Map failed");
127 return IOS_THROWN;
128 }
129 return handle(env, -1, "Map failed");
130 }
131
132 return ((jlong) (unsigned long) mapAddress);
133 }
134
135
136 JNIEXPORT jint JNICALL
137 Java_sun_nio_ch_FileChannelImpl_unmap0(JNIEnv *env, jobject this,
138 jlong address, jlong len)
139 {
140 void *a = (void *)jlong_to_ptr(address);
141 return handle(env,
142 munmap(a, (size_t)len),
143 "Unmap failed");
144 }
145
146
147 JNIEXPORT jlong JNICALL
148 Java_sun_nio_ch_FileChannelImpl_position0(JNIEnv *env, jobject this,
149 jobject fdo, jlong offset)
150 {
151 jint fd = fdval(env, fdo);
152 jlong result = 0;
153
154 if (offset < 0) {
155 result = lseek64(fd, 0, SEEK_CUR);
156 } else {
157 result = lseek64(fd, offset, SEEK_SET);
158 }
159 return handle(env, result, "Position failed");
160 }
161
162
163 JNIEXPORT void JNICALL
164 Java_sun_nio_ch_FileChannelImpl_close0(JNIEnv *env, jobject this, jobject fdo)
165 {
166 jint fd = fdval(env, fdo);
167 if (fd != -1) {
168 jlong result = close(fd);
169 if (result < 0) {
170 JNU_ThrowIOExceptionWithLastError(env, "Close failed");
171 }
172 }
173 }
174
175 JNIEXPORT jlong JNICALL
176 Java_sun_nio_ch_FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
177 jint srcFD,
178 jlong position, jlong count,
179 jint dstFD)
180 {
181 #ifdef __linux__
182 jlong max = (jlong)java_lang_Integer_MAX_VALUE;
183 jlong n;
184
185 if (my_sendfile64_func == NULL) {
186 off_t offset;
187 if (position > max)
188 return IOS_UNSUPPORTED_CASE;
189 if (count > max)
190 count = max;
191 offset = (off_t)position;
192 n = sendfile(dstFD, srcFD, &offset, (size_t)count);
193 } else {
194 off64_t offset = (off64_t)position;
195 n = (*my_sendfile64_func)(dstFD, srcFD, &offset, (size_t)count);
196 }
197 if (n < 0) {
198 if (errno == EAGAIN)
199 return IOS_UNAVAILABLE;
200 if ((errno == EINVAL) && ((ssize_t)count >= 0))
201 return IOS_UNSUPPORTED_CASE;
202 if (errno == EINTR) {
203 return IOS_INTERRUPTED;
204 }
205 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
206 return IOS_THROWN;
207 }
208 return n;
209 #endif
210
211 #ifdef __solaris__
212 if (my_sendfile_func == NULL) {
213 return IOS_UNSUPPORTED;
214 } else {
215 sendfilevec_t sfv;
216 size_t numBytes = 0;
217 jlong result;
218
219 sfv.sfv_fd = srcFD;
220 sfv.sfv_flag = 0;
221 sfv.sfv_off = (off64_t)position;
222 sfv.sfv_len = count;
223
224 result = (*my_sendfile_func)(dstFD, &sfv, 1, &numBytes);
225
226 /* Solaris sendfilev() will return -1 even if some bytes have been
227 * transferred, so we check numBytes first.
228 */
229 if (numBytes > 0)
230 return numBytes;
231 if (result < 0) {
232 if (errno == EAGAIN)
233 return IOS_UNAVAILABLE;
234 if (errno == EOPNOTSUPP)
235 return IOS_UNSUPPORTED_CASE;
236 if ((errno == EINVAL) && ((ssize_t)count >= 0))
237 return IOS_UNSUPPORTED_CASE;
238 if (errno == EINTR)
239 return IOS_INTERRUPTED;
240 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
241 return IOS_THROWN;
242 }
243 return result;
244 }
245 #endif
246 }