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
53static jfieldID chan_fd;        /* jobject 'fd' in sun.io.FileChannelImpl */
54
55JNIEXPORT jlong JNICALL
56Java_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
63static jlong
64handle(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
75JNIEXPORT jlong JNICALL
76Java_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
116JNIEXPORT jint JNICALL
117Java_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
127JNIEXPORT jlong JNICALL
128Java_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
143JNIEXPORT jlong JNICALL
144Java_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
267