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 #if defined(__linux__) || defined(__solaris__)
39 #include <sys/sendfile.h>
40 #endif
41
42 static jfieldID chan_fd; /* jobject 'fd' in sun.io.FileChannelImpl */
43
44 JNIEXPORT jlong JNICALL
45 Java_sun_nio_ch_FileChannelImpl_initIDs(JNIEnv *env, jclass clazz)
46 {
47 jlong pageSize = sysconf(_SC_PAGESIZE);
48 chan_fd = (*env)->GetFieldID(env, clazz, "fd", "Ljava/io/FileDescriptor;");
49 return pageSize;
50 }
51
52 static jlong
53 handle(JNIEnv *env, jlong rv, char *msg)
54 {
55 if (rv >= 0)
56 return rv;
57 if (errno == EINTR)
58 return IOS_INTERRUPTED;
59 JNU_ThrowIOExceptionWithLastError(env, msg);
60 return IOS_THROWN;
61 }
62
63
64 JNIEXPORT jlong JNICALL
65 Java_sun_nio_ch_FileChannelImpl_map0(JNIEnv *env, jobject this,
66 jint prot, jlong off, jlong len)
67 {
68 void *mapAddress = 0;
69 jobject fdo = (*env)->GetObjectField(env, this, chan_fd);
70 jint fd = fdval(env, fdo);
71 int protections = 0;
72 int flags = 0;
73
74 if (prot == sun_nio_ch_FileChannelImpl_MAP_RO) {
75 protections = PROT_READ;
76 flags = MAP_SHARED;
77 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_RW) {
78 protections = PROT_WRITE | PROT_READ;
79 flags = MAP_SHARED;
80 } else if (prot == sun_nio_ch_FileChannelImpl_MAP_PV) {
81 protections = PROT_WRITE | PROT_READ;
82 flags = MAP_PRIVATE;
83 }
84
85 mapAddress = mmap64(
86 0, /* Let OS decide location */
87 len, /* Number of bytes to map */
88 protections, /* File permissions */
89 flags, /* Changes are shared */
90 fd, /* File descriptor of mapped file */
91 off); /* Offset into file */
92
93 if (mapAddress == MAP_FAILED) {
94 if (errno == ENOMEM) {
95 JNU_ThrowOutOfMemoryError(env, "Map failed");
96 return IOS_THROWN;
97 }
98 return handle(env, -1, "Map failed");
99 }
100
101 return ((jlong) (unsigned long) mapAddress);
102 }
103
104
105 JNIEXPORT jint JNICALL
106 Java_sun_nio_ch_FileChannelImpl_unmap0(JNIEnv *env, jobject this,
107 jlong address, jlong len)
108 {
109 void *a = (void *)jlong_to_ptr(address);
110 return handle(env,
111 munmap(a, (size_t)len),
112 "Unmap failed");
113 }
114
115
116 JNIEXPORT jlong JNICALL
117 Java_sun_nio_ch_FileChannelImpl_position0(JNIEnv *env, jobject this,
118 jobject fdo, jlong offset)
119 {
120 jint fd = fdval(env, fdo);
121 jlong result = 0;
122
123 if (offset < 0) {
124 result = lseek64(fd, 0, SEEK_CUR);
125 } else {
126 result = lseek64(fd, offset, SEEK_SET);
127 }
128 return handle(env, result, "Position failed");
129 }
130
131
132 JNIEXPORT void JNICALL
133 Java_sun_nio_ch_FileChannelImpl_close0(JNIEnv *env, jobject this, jobject fdo)
134 {
135 jint fd = fdval(env, fdo);
136 if (fd != -1) {
137 jlong result = close(fd);
138 if (result < 0) {
139 JNU_ThrowIOExceptionWithLastError(env, "Close failed");
140 }
141 }
142 }
143
144 JNIEXPORT jlong JNICALL
145 Java_sun_nio_ch_FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
146 jint srcFD,
147 jlong position, jlong count,
148 jint dstFD)
149 {
150 #if defined(__linux__)
151 off64_t offset = (off64_t)position;
152 jlong n = sendfile64(dstFD, srcFD, &offset, (size_t)count);
153 if (n < 0) {
154 if (errno == EAGAIN)
155 return IOS_UNAVAILABLE;
156 if ((errno == EINVAL) && ((ssize_t)count >= 0))
157 return IOS_UNSUPPORTED_CASE;
158 if (errno == EINTR) {
159 return IOS_INTERRUPTED;
160 }
161 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
162 return IOS_THROWN;
163 }
164 return n;
165 #elif defined (__solaris__)
166 sendfilevec64_t sfv;
167 size_t numBytes = 0;
168 jlong result;
169
170 sfv.sfv_fd = srcFD;
171 sfv.sfv_flag = 0;
172 sfv.sfv_off = (off64_t)position;
173 sfv.sfv_len = count;
174
175 result = sendfilev64(dstFD, &sfv, 1, &numBytes);
176
177 /* Solaris sendfilev() will return -1 even if some bytes have been
178 * transferred, so we check numBytes first.
179 */
180 if (numBytes > 0)
181 return numBytes;
182 if (result < 0) {
183 if (errno == EAGAIN)
184 return IOS_UNAVAILABLE;
185 if (errno == EOPNOTSUPP)
186 return IOS_UNSUPPORTED_CASE;
187 if ((errno == EINVAL) && ((ssize_t)count >= 0))
188 return IOS_UNSUPPORTED_CASE;
189 if (errno == EINTR)
190 return IOS_INTERRUPTED;
191 JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
192 return IOS_THROWN;
193 }
194 return result;
195 #else
196 return IOS_UNSUPPORTED_CASE;
197 #endif
198 }