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