1 /*
2 * Copyright (c) 2008, 2019, 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 package sun.nio.fs;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30
31 /**
32 * Unix system and library calls.
33 */
34
35 class UnixNativeDispatcher {
36 protected UnixNativeDispatcher() { }
37
38 // returns a NativeBuffer containing the given path
39 static NativeBuffer copyToNativeBuffer(UnixPath path) {
40 byte[] cstr = path.getByteArrayForSysCalls();
41 int size = cstr.length + 1;
42 NativeBuffer buffer = NativeBuffers.getNativeBufferFromCache(size);
43 if (buffer == null) {
44 buffer = NativeBuffers.allocNativeBuffer(size);
45 } else {
46 // buffer already contains the path
47 if (buffer.owner() == path)
48 return buffer;
49 }
50 NativeBuffers.copyCStringToNativeBuffer(cstr, buffer);
51 buffer.setOwner(path);
52 return buffer;
53 }
54
55 /**
56 * char *getcwd(char *buf, size_t size);
57 */
58 static native byte[] getcwd();
59
60 /**
61 * int dup(int filedes)
62 */
63 static native int dup(int filedes) throws UnixException;
64
65 /**
66 * int open(const char* path, int oflag, mode_t mode)
67 */
68 static int open(UnixPath path, int flags, int mode) throws UnixException {
69 NativeBuffer buffer = copyToNativeBuffer(path);
70 try {
71 return open0(buffer.address(), flags, mode);
72 } finally {
73 buffer.release();
74 }
75 }
76 private static native int open0(long pathAddress, int flags, int mode)
77 throws UnixException;
78
79 /**
80 * int openat(int dfd, const char* path, int oflag, mode_t mode)
81 */
82 static int openat(int dfd, byte[] path, int flags, int mode) throws UnixException {
83 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
84 try {
85 return openat0(dfd, buffer.address(), flags, mode);
86 } finally {
87 buffer.release();
88 }
89 }
90 private static native int openat0(int dfd, long pathAddress, int flags, int mode)
91 throws UnixException;
92
93 /**
94 * close(int filedes)
95 */
96 static native void close(int fd);
97
98 /**
99 * FILE* fopen(const char *filename, const char* mode);
100 */
101 static long fopen(UnixPath filename, String mode) throws UnixException {
102 NativeBuffer pathBuffer = copyToNativeBuffer(filename);
103 NativeBuffer modeBuffer = NativeBuffers.asNativeBuffer(Util.toBytes(mode));
104 try {
105 return fopen0(pathBuffer.address(), modeBuffer.address());
106 } finally {
107 modeBuffer.release();
108 pathBuffer.release();
109 }
110 }
111 private static native long fopen0(long pathAddress, long modeAddress)
112 throws UnixException;
113
114 /**
115 * fclose(FILE* stream)
116 */
117 static native void fclose(long stream) throws UnixException;
118
119 /**
120 * void rewind(FILE* stream);
121 */
122 static native void rewind(long stream) throws UnixException;
123
124 /**
125 * link(const char* existing, const char* new)
126 */
127 static void link(UnixPath existing, UnixPath newfile) throws UnixException {
128 NativeBuffer existingBuffer = copyToNativeBuffer(existing);
129 NativeBuffer newBuffer = copyToNativeBuffer(newfile);
130 try {
131 link0(existingBuffer.address(), newBuffer.address());
132 } finally {
133 newBuffer.release();
134 existingBuffer.release();
135 }
136 }
137 private static native void link0(long existingAddress, long newAddress)
138 throws UnixException;
139
140 /**
141 * unlink(const char* path)
142 */
143 static void unlink(UnixPath path) throws UnixException {
144 NativeBuffer buffer = copyToNativeBuffer(path);
145 try {
146 unlink0(buffer.address());
147 } finally {
148 buffer.release();
149 }
150 }
151 private static native void unlink0(long pathAddress) throws UnixException;
152
153 /**
154 * unlinkat(int dfd, const char* path, int flag)
155 */
156 static void unlinkat(int dfd, byte[] path, int flag) throws UnixException {
157 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
158 try {
159 unlinkat0(dfd, buffer.address(), flag);
160 } finally {
161 buffer.release();
162 }
163 }
164 private static native void unlinkat0(int dfd, long pathAddress, int flag)
165 throws UnixException;
166
167 /**
168 * mknod(const char* path, mode_t mode, dev_t dev)
169 */
170 static void mknod(UnixPath path, int mode, long dev) throws UnixException {
171 NativeBuffer buffer = copyToNativeBuffer(path);
172 try {
173 mknod0(buffer.address(), mode, dev);
174 } finally {
175 buffer.release();
176 }
177 }
178 private static native void mknod0(long pathAddress, int mode, long dev)
179 throws UnixException;
180
181 /**
182 * rename(const char* old, const char* new)
183 */
184 static void rename(UnixPath from, UnixPath to) throws UnixException {
185 NativeBuffer fromBuffer = copyToNativeBuffer(from);
186 NativeBuffer toBuffer = copyToNativeBuffer(to);
187 try {
188 rename0(fromBuffer.address(), toBuffer.address());
189 } finally {
190 toBuffer.release();
191 fromBuffer.release();
192 }
193 }
194 private static native void rename0(long fromAddress, long toAddress)
195 throws UnixException;
196
197 /**
198 * renameat(int fromfd, const char* old, int tofd, const char* new)
199 */
200 static void renameat(int fromfd, byte[] from, int tofd, byte[] to) throws UnixException {
201 NativeBuffer fromBuffer = NativeBuffers.asNativeBuffer(from);
202 NativeBuffer toBuffer = NativeBuffers.asNativeBuffer(to);
203 try {
204 renameat0(fromfd, fromBuffer.address(), tofd, toBuffer.address());
205 } finally {
206 toBuffer.release();
207 fromBuffer.release();
208 }
209 }
210 private static native void renameat0(int fromfd, long fromAddress, int tofd, long toAddress)
211 throws UnixException;
212
213 /**
214 * mkdir(const char* path, mode_t mode)
215 */
216 static void mkdir(UnixPath path, int mode) throws UnixException {
217 NativeBuffer buffer = copyToNativeBuffer(path);
218 try {
219 mkdir0(buffer.address(), mode);
220 } finally {
221 buffer.release();
222 }
223 }
224 private static native void mkdir0(long pathAddress, int mode) throws UnixException;
225
226 /**
227 * rmdir(const char* path)
228 */
229 static void rmdir(UnixPath path) throws UnixException {
230 NativeBuffer buffer = copyToNativeBuffer(path);
231 try {
232 rmdir0(buffer.address());
233 } finally {
234 buffer.release();
235 }
236 }
237 private static native void rmdir0(long pathAddress) throws UnixException;
238
239 /**
240 * readlink(const char* path, char* buf, size_t bufsize)
241 *
242 * @return link target
243 */
244 static byte[] readlink(UnixPath path) throws UnixException {
245 NativeBuffer buffer = copyToNativeBuffer(path);
246 try {
247 return readlink0(buffer.address());
248 } finally {
249 buffer.release();
250 }
251 }
252 private static native byte[] readlink0(long pathAddress) throws UnixException;
253
254 /**
255 * realpath(const char* path, char* resolved_name)
256 *
257 * @return resolved path
258 */
259 static byte[] realpath(UnixPath path) throws UnixException {
260 NativeBuffer buffer = copyToNativeBuffer(path);
261 try {
262 return realpath0(buffer.address());
263 } finally {
264 buffer.release();
265 }
266 }
267 private static native byte[] realpath0(long pathAddress) throws UnixException;
268
269 /**
270 * symlink(const char* name1, const char* name2)
271 */
272 static void symlink(byte[] name1, UnixPath name2) throws UnixException {
273 NativeBuffer targetBuffer = NativeBuffers.asNativeBuffer(name1);
274 NativeBuffer linkBuffer = copyToNativeBuffer(name2);
275 try {
276 symlink0(targetBuffer.address(), linkBuffer.address());
277 } finally {
278 linkBuffer.release();
279 targetBuffer.release();
280 }
281 }
282 private static native void symlink0(long name1, long name2)
283 throws UnixException;
284
285 /**
286 * stat(const char* path, struct stat* buf)
287 */
288 static void stat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
289 NativeBuffer buffer = copyToNativeBuffer(path);
290 try {
291 stat0(buffer.address(), attrs);
292 } finally {
293 buffer.release();
294 }
295 }
296 private static native void stat0(long pathAddress, UnixFileAttributes attrs)
297 throws UnixException;
298
299 /**
300 * lstat(const char* path, struct stat* buf)
301 */
302 static void lstat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
303 NativeBuffer buffer = copyToNativeBuffer(path);
304 try {
305 lstat0(buffer.address(), attrs);
306 } finally {
307 buffer.release();
308 }
309 }
310 private static native void lstat0(long pathAddress, UnixFileAttributes attrs)
311 throws UnixException;
312
313 /**
314 * fstat(int filedes, struct stat* buf)
315 */
316 static native void fstat(int fd, UnixFileAttributes attrs) throws UnixException;
317
318 /**
319 * fstatat(int filedes,const char* path, struct stat* buf, int flag)
320 */
321 static void fstatat(int dfd, byte[] path, int flag, UnixFileAttributes attrs)
322 throws UnixException
323 {
324 NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
325 try {
326 fstatat0(dfd, buffer.address(), flag, attrs);
327 } finally {
328 buffer.release();
329 }
330 }
331 private static native void fstatat0(int dfd, long pathAddress, int flag,
332 UnixFileAttributes attrs) throws UnixException;
333
334 /**
335 * chown(const char* path, uid_t owner, gid_t group)
336 */
337 static void chown(UnixPath path, int uid, int gid) throws UnixException {
338 NativeBuffer buffer = copyToNativeBuffer(path);
339 try {
340 chown0(buffer.address(), uid, gid);
341 } finally {
342 buffer.release();
343 }
344 }
345 private static native void chown0(long pathAddress, int uid, int gid)
346 throws UnixException;
347
348 /**
349 * lchown(const char* path, uid_t owner, gid_t group)
350 */
351 static void lchown(UnixPath path, int uid, int gid) throws UnixException {
352 NativeBuffer buffer = copyToNativeBuffer(path);
353 try {
354 lchown0(buffer.address(), uid, gid);
355 } finally {
356 buffer.release();
357 }
358 }
359 private static native void lchown0(long pathAddress, int uid, int gid)
360 throws UnixException;
361
362 /**
363 * fchown(int filedes, uid_t owner, gid_t group)
364 */
365 static native void fchown(int fd, int uid, int gid) throws UnixException;
366
367 /**
368 * chmod(const char* path, mode_t mode)
369 */
370 static void chmod(UnixPath path, int mode) throws UnixException {
371 NativeBuffer buffer = copyToNativeBuffer(path);
372 try {
373 chmod0(buffer.address(), mode);
374 } finally {
375 buffer.release();
376 }
377 }
378 private static native void chmod0(long pathAddress, int mode)
379 throws UnixException;
380
381 /**
382 * fchmod(int fildes, mode_t mode)
383 */
384 static native void fchmod(int fd, int mode) throws UnixException;
385
386 /**
387 * utimes(conar char* path, const struct timeval times[2])
388 */
389 static void utimes(UnixPath path, long times0, long times1)
390 throws UnixException
391 {
392 NativeBuffer buffer = copyToNativeBuffer(path);
393 try {
394 utimes0(buffer.address(), times0, times1);
395 } finally {
396 buffer.release();
397 }
398 }
399 private static native void utimes0(long pathAddress, long times0, long times1)
400 throws UnixException;
401
402 /**
403 * futimes(int fildes,, const struct timeval times[2])
404 */
405 static native void futimes(int fd, long times0, long times1) throws UnixException;
406
407 /**
408 * DIR *opendir(const char* dirname)
409 */
410 static long opendir(UnixPath path) throws UnixException {
411 NativeBuffer buffer = copyToNativeBuffer(path);
412 try {
413 return opendir0(buffer.address());
414 } finally {
415 buffer.release();
416 }
417 }
418 private static native long opendir0(long pathAddress) throws UnixException;
419
420 /**
421 * DIR* fdopendir(int filedes)
422 */
423 static native long fdopendir(int dfd) throws UnixException;
424
425
426 /**
427 * closedir(DIR* dirp)
428 */
429 static native void closedir(long dir) throws UnixException;
430
431 /**
432 * struct dirent* readdir(DIR *dirp)
433 *
434 * @return dirent->d_name
435 */
436 static native byte[] readdir(long dir) throws UnixException;
437
438 /**
439 * size_t read(int fildes, void* buf, size_t nbyte)
440 */
441 static native int read(int fildes, long buf, int nbyte) throws UnixException;
442
443 /**
444 * size_t writeint fildes, void* buf, size_t nbyte)
445 */
446 static native int write(int fildes, long buf, int nbyte) throws UnixException;
447
448 /**
449 * access(const char* path, int amode);
450 */
451 static void access(UnixPath path, int amode) throws UnixException {
452 NativeBuffer buffer = copyToNativeBuffer(path);
453 try {
454 access0(buffer.address(), amode);
455 } finally {
456 buffer.release();
457 }
458 }
459 private static native void access0(long pathAddress, int amode) throws UnixException;
460
461 /**
462 * struct passwd *getpwuid(uid_t uid);
463 *
464 * @return passwd->pw_name
465 */
466 static native byte[] getpwuid(int uid) throws UnixException;
467
468 /**
469 * struct group *getgrgid(gid_t gid);
470 *
471 * @return group->gr_name
472 */
473 static native byte[] getgrgid(int gid) throws UnixException;
474
475 /**
476 * struct passwd *getpwnam(const char *name);
477 *
478 * @return passwd->pw_uid
479 */
480 static int getpwnam(String name) throws UnixException {
481 NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
482 try {
483 return getpwnam0(buffer.address());
484 } finally {
485 buffer.release();
486 }
487 }
488 private static native int getpwnam0(long nameAddress) throws UnixException;
489
490 /**
491 * struct group *getgrnam(const char *name);
492 *
493 * @return group->gr_name
494 */
495 static int getgrnam(String name) throws UnixException {
496 NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
497 try {
498 return getgrnam0(buffer.address());
499 } finally {
500 buffer.release();
501 }
502 }
503 private static native int getgrnam0(long nameAddress) throws UnixException;
504
505 /**
506 * statvfs(const char* path, struct statvfs *buf)
507 */
508 static void statvfs(UnixPath path, UnixFileStoreAttributes attrs)
509 throws UnixException
510 {
511 NativeBuffer buffer = copyToNativeBuffer(path);
512 try {
513 statvfs0(buffer.address(), attrs);
514 } finally {
515 buffer.release();
516 }
517 }
518 private static native void statvfs0(long pathAddress, UnixFileStoreAttributes attrs)
519 throws UnixException;
520
521 /**
522 * long int pathconf(const char *path, int name);
523 */
524 static long pathconf(UnixPath path, int name) throws UnixException {
525 NativeBuffer buffer = copyToNativeBuffer(path);
526 try {
527 return pathconf0(buffer.address(), name);
528 } finally {
529 buffer.release();
530 }
531 }
532 private static native long pathconf0(long pathAddress, int name)
533 throws UnixException;
534
535 /**
536 * long fpathconf(int fildes, int name);
537 */
538 static native long fpathconf(int filedes, int name) throws UnixException;
539
540 /**
541 * char* strerror(int errnum)
542 */
543 static native byte[] strerror(int errnum);
544
545 /**
546 * Capabilities
547 */
548 private static final int SUPPORTS_OPENAT = 1 << 1; // syscalls
549 private static final int SUPPORTS_FUTIMES = 1 << 2;
550 private static final int SUPPORTS_BIRTHTIME = 1 << 16; // other features
551 private static final int capabilities;
552
553 /**
554 * Supports openat and other *at calls.
555 */
556 static boolean openatSupported() {
557 return (capabilities & SUPPORTS_OPENAT) != 0;
558 }
559
560 /**
561 * Supports futimes or futimesat
562 */
563 static boolean futimesSupported() {
564 return (capabilities & SUPPORTS_FUTIMES) != 0;
565 }
566
567 /**
568 * Supports file birth (creation) time attribute
569 */
570 static boolean birthtimeSupported() {
571 return (capabilities & SUPPORTS_BIRTHTIME) != 0;
572 }
573
574 private static native int init();
575 static {
576 AccessController.doPrivileged(new PrivilegedAction<Void>() {
577 public Void run() {
578 System.loadLibrary("nio");
579 return null;
580 }});
581 capabilities = init();
582 }
583 }