1 /*
2 * Copyright (c) 2000, 2012, 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 "sun_nio_ch_FileDispatcherImpl.h"
31 #include "java_lang_Long.h"
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <fcntl.h>
35 #include <sys/uio.h>
36 #include <unistd.h>
37 #include "nio.h"
38 #include "nio_util.h"
39
40 #ifdef _ALLBSD_SOURCE
41 #define stat64 stat
42 #define flock64 flock
43 #define off64_t off_t
44 #define F_SETLKW64 F_SETLKW
45 #define F_SETLK64 F_SETLK
46
47 #define pread64 pread
48 #define pwrite64 pwrite
49 #define ftruncate64 ftruncate
50 #define fstat64 fstat
51
52 #define fdatasync fsync
53 #endif
54
55 static int preCloseFD = -1; /* File descriptor to which we dup other fd's
56 before closing them for real */
57
58
59 JNIEXPORT void JNICALL
60 Java_sun_nio_ch_FileDispatcherImpl_init(JNIEnv *env, jclass cl)
61 {
62 int sp[2];
63 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) < 0) {
64 JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");
65 return;
66 }
67 preCloseFD = sp[0];
68 close(sp[1]);
69 }
70
71 JNIEXPORT jint JNICALL
72 Java_sun_nio_ch_FileDispatcherImpl_read0(JNIEnv *env, jclass clazz,
73 jobject fdo, jlong address, jint len)
74 {
75 jint fd = fdval(env, fdo);
76 void *buf = (void *)jlong_to_ptr(address);
77
78 return convertReturnVal(env, read(fd, buf, len), JNI_TRUE);
79 }
80
81 JNIEXPORT jint JNICALL
82 Java_sun_nio_ch_FileDispatcherImpl_pread0(JNIEnv *env, jclass clazz, jobject fdo,
83 jlong address, jint len, jlong offset)
84 {
85 jint fd = fdval(env, fdo);
86 void *buf = (void *)jlong_to_ptr(address);
87
88 return convertReturnVal(env, pread64(fd, buf, len, offset), JNI_TRUE);
89 }
90
91 JNIEXPORT jlong JNICALL
92 Java_sun_nio_ch_FileDispatcherImpl_readv0(JNIEnv *env, jclass clazz,
93 jobject fdo, jlong address, jint len)
94 {
95 jint fd = fdval(env, fdo);
96 struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
97 return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE);
98 }
99
100 JNIEXPORT jint JNICALL
101 Java_sun_nio_ch_FileDispatcherImpl_write0(JNIEnv *env, jclass clazz,
102 jobject fdo, jlong address, jint len)
103 {
104 jint fd = fdval(env, fdo);
105 void *buf = (void *)jlong_to_ptr(address);
106
107 return convertReturnVal(env, write(fd, buf, len), JNI_FALSE);
108 }
109
110 JNIEXPORT jint JNICALL
111 Java_sun_nio_ch_FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,
112 jlong address, jint len, jlong offset)
113 {
114 jint fd = fdval(env, fdo);
115 void *buf = (void *)jlong_to_ptr(address);
116
117 return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);
118 }
119
120 JNIEXPORT jlong JNICALL
121 Java_sun_nio_ch_FileDispatcherImpl_writev0(JNIEnv *env, jclass clazz,
122 jobject fdo, jlong address, jint len)
123 {
124 jint fd = fdval(env, fdo);
125 struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
126 return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE);
127 }
128
129 static jlong
130 handle(JNIEnv *env, jlong rv, char *msg)
131 {
132 if (rv >= 0)
133 return rv;
134 if (errno == EINTR)
135 return IOS_INTERRUPTED;
136 JNU_ThrowIOExceptionWithLastError(env, msg);
137 return IOS_THROWN;
138 }
139
140 JNIEXPORT jint JNICALL
141 Java_sun_nio_ch_FileDispatcherImpl_force0(JNIEnv *env, jobject this,
142 jobject fdo, jboolean md)
143 {
144 jint fd = fdval(env, fdo);
145 int result = 0;
146
147 if (md == JNI_FALSE) {
148 result = fdatasync(fd);
149 } else {
150 result = fsync(fd);
151 }
152 return handle(env, result, "Force failed");
153 }
154
155 JNIEXPORT jint JNICALL
156 Java_sun_nio_ch_FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,
157 jobject fdo, jlong size)
158 {
159 return handle(env,
160 ftruncate64(fdval(env, fdo), size),
161 "Truncation failed");
162 }
163
164 JNIEXPORT jlong JNICALL
165 Java_sun_nio_ch_FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)
166 {
167 struct stat64 fbuf;
168
169 if (fstat64(fdval(env, fdo), &fbuf) < 0)
170 return handle(env, -1, "Size failed");
171 return fbuf.st_size;
172 }
173
174 JNIEXPORT jint JNICALL
175 Java_sun_nio_ch_FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo,
176 jboolean block, jlong pos, jlong size,
177 jboolean shared)
178 {
179 jint fd = fdval(env, fdo);
180 jint lockResult = 0;
181 int cmd = 0;
182 struct flock64 fl;
183
184 fl.l_whence = SEEK_SET;
185 if (size == (jlong)java_lang_Long_MAX_VALUE) {
186 fl.l_len = (off64_t)0;
187 } else {
188 fl.l_len = (off64_t)size;
189 }
190 fl.l_start = (off64_t)pos;
191 if (shared == JNI_TRUE) {
192 fl.l_type = F_RDLCK;
193 } else {
194 fl.l_type = F_WRLCK;
195 }
196 if (block == JNI_TRUE) {
197 cmd = F_SETLKW64;
198 } else {
199 cmd = F_SETLK64;
200 }
201 lockResult = fcntl(fd, cmd, &fl);
202 if (lockResult < 0) {
203 if ((cmd == F_SETLK64) && (errno == EAGAIN || errno == EACCES))
204 return sun_nio_ch_FileDispatcherImpl_NO_LOCK;
205 if (errno == EINTR)
206 return sun_nio_ch_FileDispatcherImpl_INTERRUPTED;
207 JNU_ThrowIOExceptionWithLastError(env, "Lock failed");
208 }
209 return 0;
210 }
211
212 JNIEXPORT void JNICALL
213 Java_sun_nio_ch_FileDispatcherImpl_release0(JNIEnv *env, jobject this,
214 jobject fdo, jlong pos, jlong size)
215 {
216 jint fd = fdval(env, fdo);
217 jint lockResult = 0;
218 struct flock64 fl;
219 int cmd = F_SETLK64;
220
221 fl.l_whence = SEEK_SET;
222 if (size == (jlong)java_lang_Long_MAX_VALUE) {
223 fl.l_len = (off64_t)0;
224 } else {
225 fl.l_len = (off64_t)size;
226 }
227 fl.l_start = (off64_t)pos;
228 fl.l_type = F_UNLCK;
229 lockResult = fcntl(fd, cmd, &fl);
230 if (lockResult < 0) {
231 JNU_ThrowIOExceptionWithLastError(env, "Release failed");
232 }
233 }
234
235
236 static void closeFileDescriptor(JNIEnv *env, int fd) {
237 if (fd != -1) {
238 int result = close(fd);
239 if (result < 0)
240 JNU_ThrowIOExceptionWithLastError(env, "Close failed");
241 }
242 }
243
244 JNIEXPORT void JNICALL
245 Java_sun_nio_ch_FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo)
246 {
247 jint fd = fdval(env, fdo);
248 closeFileDescriptor(env, fd);
249 }
250
251 JNIEXPORT void JNICALL
252 Java_sun_nio_ch_FileDispatcherImpl_preClose0(JNIEnv *env, jclass clazz, jobject fdo)
253 {
254 jint fd = fdval(env, fdo);
255 if (preCloseFD >= 0) {
256 if (dup2(preCloseFD, fd) < 0)
257 JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");
258 }
259 }
260
261 JNIEXPORT void JNICALL
262 Java_sun_nio_ch_FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd)
263 {
264 closeFileDescriptor(env, fd);
265 }