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Merge Chromium + Blink git repositories
[chromium-blink-merge.git] / native_client_sdk / src / libraries / nacl_io / kernel_wrap_bionic.cc
blobde3f759fb57922ef046e1e244855fb9892a90f3b
1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <sys/types.h> // Include something that will define __BIONIC__.
6
7 #include "nacl_io/kernel_wrap.h" // IRT_EXT is turned on in this header.
8
9 // The entire file is wrapped in this #if. We do this so this .cc file can be
10 // compiled, even on a non-bionic build.
11
12 #if !defined(NACL_IO_IRT_EXT) && defined(__native_client__) && \
13 defined(__BIONIC__)
14
15 #include <alloca.h>
16 #include <assert.h>
17 #include <dirent.h>
18 #include <errno.h>
19 #include <irt_syscalls.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <sys/time.h>
23
24 #include "nacl_io/kernel_intercept.h"
25 #include "nacl_io/kernel_wrap_real.h"
26 #include "nacl_io/nacl_abi_types.h"
27 #include "nacl_io/osmman.h"
28
29 namespace {
30
31 void stat_to_nacl_stat(const struct stat* buf, nacl_abi_stat* nacl_buf) {
32 memset(nacl_buf, 0, sizeof(struct nacl_abi_stat));
33 nacl_buf->nacl_abi_st_dev = buf->st_dev;
34 nacl_buf->nacl_abi_st_ino = buf->st_ino;
35 nacl_buf->nacl_abi_st_mode = buf->st_mode;
36 nacl_buf->nacl_abi_st_nlink = buf->st_nlink;
37 nacl_buf->nacl_abi_st_uid = buf->st_uid;
38 nacl_buf->nacl_abi_st_gid = buf->st_gid;
39 nacl_buf->nacl_abi_st_rdev = buf->st_rdev;
40 nacl_buf->nacl_abi_st_size = buf->st_size;
41 nacl_buf->nacl_abi_st_blksize = buf->st_blksize;
42 nacl_buf->nacl_abi_st_blocks = buf->st_blocks;
43 nacl_buf->nacl_abi_st_atime = buf->st_atime;
44 nacl_buf->nacl_abi_st_mtime = buf->st_mtime;
45 nacl_buf->nacl_abi_st_ctime = buf->st_ctime;
46 }
47
48 void nacl_stat_to_stat(const nacl_abi_stat* nacl_buf, struct stat* buf) {
49 memset(buf, 0, sizeof(struct stat));
50 buf->st_dev = nacl_buf->nacl_abi_st_dev;
51 buf->st_ino = nacl_buf->nacl_abi_st_ino;
52 buf->st_mode = nacl_buf->nacl_abi_st_mode;
53 buf->st_nlink = nacl_buf->nacl_abi_st_nlink;
54 buf->st_uid = nacl_buf->nacl_abi_st_uid;
55 buf->st_gid = nacl_buf->nacl_abi_st_gid;
56 buf->st_rdev = nacl_buf->nacl_abi_st_rdev;
57 buf->st_size = nacl_buf->nacl_abi_st_size;
58 buf->st_blksize = nacl_buf->nacl_abi_st_blksize;
59 buf->st_blocks = nacl_buf->nacl_abi_st_blocks;
60 buf->st_atime = nacl_buf->nacl_abi_st_atime;
61 buf->st_mtime = nacl_buf->nacl_abi_st_mtime;
62 buf->st_ctime = nacl_buf->nacl_abi_st_ctime;
63 }
64
65 } // namespace
66
67 static const int d_name_shift = offsetof (dirent, d_name) -
68 offsetof (struct nacl_abi_dirent, nacl_abi_d_name);
69
70 EXTERN_C_BEGIN
71
72 // Macro to get the REAL function pointer
73 #define REAL(name) __nacl_irt_##name##_real
74
75 // Macro to get the WRAP function
76 #define WRAP(name) __nacl_irt_##name##_wrap
77
78 // Declare REAL function pointer.
79 #define DECLARE_REAL_PTR(name) typeof(__nacl_irt_##name) REAL(name);
80
81 // Assign the REAL function pointer.
82 #define ASSIGN_REAL_PTR(name) REAL(name) = __nacl_irt_##name;
83
84 // Switch IRT's pointer to the REAL pointer
85 #define USE_REAL(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))REAL(name)
86
87 // Switch IRT's pointer to the WRAP function
88 #define USE_WRAP(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))WRAP(name)
89
90 #define EXPAND_SYMBOL_LIST_OPERATION(OP) \
91 OP(chdir); \
92 OP(close); \
93 OP(dup); \
94 OP(dup2); \
95 OP(exit); \
96 OP(fchdir); \
97 OP(fchmod); \
98 OP(fdatasync); \
99 OP(fstat); \
100 OP(fsync); \
101 OP(getcwd); \
102 OP(getdents); \
103 OP(isatty); \
104 OP(lstat); \
105 OP(mkdir); \
106 OP(mmap); \
107 OP(munmap); \
108 OP(open); \
109 OP(open_resource); \
110 OP(poll); \
111 OP(read); \
112 OP(readlink); \
113 OP(rmdir); \
114 OP(seek); \
115 OP(stat); \
116 OP(truncate); \
117 OP(write);
118
119 EXPAND_SYMBOL_LIST_OPERATION(DECLARE_REAL_PTR);
120
121 int WRAP(chdir)(const char* pathname) {
122 ERRNO_RTN(ki_chdir(pathname));
123 }
124
125 int WRAP(close)(int fd) {
126 ERRNO_RTN(ki_close(fd));
127 }
128
129 int WRAP(dup)(int fd, int* newfd) NOTHROW {
130 *newfd = ki_dup(fd);
131 ERRNO_RTN(*newfd);
132 }
133
134 int WRAP(dup2)(int fd, int newfd) NOTHROW {
135 ERRNO_RTN(ki_dup2(fd, newfd));
136 }
137
138 void WRAP(exit)(int status) {
139 ki_exit(status);
140 }
141
142 int WRAP(fchdir)(int fd) NOTHROW {
143 ERRNO_RTN(ki_fchdir(fd));
144 }
145
146 int WRAP(fchmod)(int fd, mode_t mode) NOTHROW {
147 ERRNO_RTN(ki_fchmod(fd, mode));
148 }
149
150 int WRAP(fdatasync)(int fd) NOTHROW {
151 ERRNO_RTN(ki_fdatasync(fd));
152 }
153
154 int WRAP(fstat)(int fd, struct nacl_abi_stat* nacl_buf) {
155 struct stat buf;
156 memset(&buf, 0, sizeof(struct stat));
157 int res = ki_fstat(fd, &buf);
158 RTN_ERRNO_IF(res < 0);
159 stat_to_nacl_stat(&buf, nacl_buf);
160 return 0;
161 }
162
163 int WRAP(fsync)(int fd) NOTHROW {
164 ERRNO_RTN(ki_fsync(fd));
165 }
166
167 int WRAP(getcwd)(char* buf, size_t size) {
168 RTN_ERRNO_IF(ki_getcwd(buf, size) == NULL);
169 return 0;
170 }
171
172 int WRAP(getdents)(int fd, dirent* nacl_buf, size_t nacl_count, size_t* nread) {
173 int nacl_offset = 0;
174 // "buf" contains dirent(s); "nacl_buf" contains nacl_abi_dirent(s).
175 // nacl_abi_dirent(s) are smaller than dirent(s), so nacl_count bytes buffer
176 // is enough
177 char* buf = (char*)alloca(nacl_count);
178 int offset = 0;
179 int count;
180
181 count = ki_getdents(fd, (dirent*)buf, nacl_count);
182 RTN_ERRNO_IF(count < 0);
183
184 while (offset < count) {
185 dirent* d = (dirent*)(buf + offset);
186 nacl_abi_dirent* nacl_d = (nacl_abi_dirent*)((char*)nacl_buf + nacl_offset);
187 nacl_d->nacl_abi_d_ino = d->d_ino;
188 nacl_d->nacl_abi_d_off = d->d_off;
189 nacl_d->nacl_abi_d_reclen = d->d_reclen - d_name_shift;
190 size_t d_name_len = d->d_reclen - offsetof(dirent, d_name);
191 memcpy(nacl_d->nacl_abi_d_name, d->d_name, d_name_len);
192
193 offset += d->d_reclen;
194 nacl_offset += nacl_d->nacl_abi_d_reclen;
195 }
196
197 *nread = nacl_offset;
198 return 0;
199 }
200
201 int WRAP(isatty)(int fd, int* result) {
202 *result = ki_isatty(fd);
203 RTN_ERRNO_IF(*result == 0);
204 return 0;
205 }
206
207 int WRAP(lstat)(const char* path, struct nacl_abi_stat* nacl_buf) {
208 struct stat buf;
209 memset(&buf, 0, sizeof(struct stat));
210 int res = ki_lstat(path, &buf);
211 RTN_ERRNO_IF(res < 0);
212 stat_to_nacl_stat(&buf, nacl_buf);
213 return 0;
214 }
215
216 int WRAP(mkdir)(const char* pathname, mode_t mode) {
217 ERRNO_RTN(ki_mkdir(pathname, mode));
218 }
219
220 int WRAP(mmap)(void** addr,
221 size_t length,
222 int prot,
223 int flags,
224 int fd,
225 int64_t offset) {
226 if (flags & MAP_ANONYMOUS)
227 return REAL(mmap)(addr, length, prot, flags, fd, offset);
228
229 *addr = ki_mmap(*addr, length, prot, flags, fd, offset);
230 RTN_ERRNO_IF(*addr == (void*)-1)
231 return 0;
232 }
233
234 int WRAP(munmap)(void* addr, size_t length) {
235 // Always let the real munmap run on the address range. It is not an error if
236 // there are no mapped pages in that range.
237 ki_munmap(addr, length);
238 return REAL(munmap)(addr, length);
239 }
240
241 int WRAP(open)(const char* pathname, int oflag, mode_t mode, int* newfd) {
242 *newfd = ki_open(pathname, oflag, mode);
243 ERRNO_RTN(*newfd);
244 }
245
246 int WRAP(open_resource)(const char* file, int* fd) {
247 *fd = ki_open_resource(file);
248 ERRNO_RTN(*fd);
249 }
250
251 int WRAP(poll)(struct pollfd* fds, nfds_t nfds, int timeout, int* count) {
252 *count = ki_poll(fds, nfds, timeout);
253 ERRNO_RTN(*count);
254 }
255
256 int WRAP(read)(int fd, void* buf, size_t count, size_t* nread) {
257 ssize_t signed_nread = ki_read(fd, buf, count);
258 *nread = static_cast<size_t>(signed_nread);
259 ERRNO_RTN(signed_nread);
260 }
261
262 int WRAP(readlink)(const char* path, char* buf, size_t count, size_t* nread) {
263 ssize_t signed_nread = ki_readlink(path, buf, count);
264 *nread = static_cast<size_t>(signed_nread);
265 ERRNO_RTN(signed_nread);
266 }
267
268 int WRAP(rmdir)(const char* pathname) {
269 ERRNO_RTN(ki_rmdir(pathname));
270 }
271
272 int WRAP(seek)(int fd, off64_t offset, int whence, int64_t* new_offset) {
273 *new_offset = ki_lseek(fd, offset, whence);
274 ERRNO_RTN(*new_offset);
275 }
276
277 int WRAP(select)(int nfds,
278 fd_set* readfds,
279 fd_set* writefds,
280 fd_set* exceptfds,
281 struct timeval* timeout,
282 int* count) {
283 *count = ki_select(nfds, readfds, writefds, exceptfds, timeout);
284 ERRNO_RTN(*count);
285 }
286
287 int WRAP(stat)(const char* pathname, struct nacl_abi_stat* nacl_buf) {
288 struct stat buf;
289 memset(&buf, 0, sizeof(struct stat));
290 int res = ki_stat(pathname, &buf);
291 RTN_ERRNO_IF(res < 0);
292 stat_to_nacl_stat(&buf, nacl_buf);
293 return 0;
294 }
295
296 int WRAP(truncate)(const char* name, int64_t len) {
297 ERRNO_RTN(ki_truncate(name, len));
298 }
299
300 int WRAP(write)(int fd, const void* buf, size_t count, size_t* nwrote) {
301 ssize_t signed_nwrote = ki_write(fd, buf, count);
302 *nwrote = static_cast<size_t>(signed_nwrote);
303 ERRNO_RTN(signed_nwrote);
304 }
305
306 static void assign_real_pointers() {
307 static bool assigned = false;
308 if (!assigned) {
309 EXPAND_SYMBOL_LIST_OPERATION(ASSIGN_REAL_PTR)
310 assigned = true;
311 }
312 }
313
314 #define CHECK_REAL(func) \
315 if (!REAL(func)) { \
316 assign_real_pointers(); \
317 if (!REAL(func)) \
318 return ENOSYS; \
319 }
320
321 // "real" functions, i.e. the unwrapped original functions.
322
323 int _real_close(int fd) {
324 CHECK_REAL(close);
325 return REAL(close)(fd);
326 }
327
328 void _real_exit(int status) {
329 REAL(exit)(status);
330 }
331
332 int _real_fchdir(int fd) {
333 CHECK_REAL(fchdir);
334 return REAL(fchdir)(fd);
335 }
336
337 int _real_fchmod(int fd, mode_t mode) {
338 CHECK_REAL(fchmod);
339 return REAL(fchmod)(fd, mode);
340 }
341
342 int _real_fdatasync(int fd) {
343 CHECK_REAL(fdatasync);
344 return REAL(fdatasync)(fd);
345 }
346
347 int _real_fstat(int fd, struct stat* buf) {
348 struct nacl_abi_stat st;
349 CHECK_REAL(fstat);
350
351 int err = REAL(fstat)(fd, (struct stat*)&st);
352 if (err) {
353 errno = err;
354 return -1;
355 }
356
357 nacl_stat_to_stat(&st, buf);
358 return 0;
359 }
360
361 int _real_fsync(int fd) {
362 CHECK_REAL(fsync);
363 return REAL(fsync)(fd);
364 }
365
366 int _real_getdents(int fd, void* buf, size_t count, size_t* nread) {
367 // "buf" contains dirent(s); "nacl_buf" contains nacl_abi_dirent(s).
368 // See WRAP(getdents) above.
369 char* nacl_buf = (char*)alloca(count);
370 size_t offset = 0;
371 size_t nacl_offset = 0;
372 size_t nacl_nread;
373 CHECK_REAL(getdents);
374 int err = REAL(getdents)(fd, (dirent*)nacl_buf, count, &nacl_nread);
375 if (err)
376 return err;
377
378 while (nacl_offset < nacl_nread) {
379 dirent* d = (dirent*)((char*)buf + offset);
380 nacl_abi_dirent* nacl_d = (nacl_abi_dirent*)(nacl_buf + nacl_offset);
381 d->d_ino = nacl_d->nacl_abi_d_ino;
382 d->d_off = nacl_d->nacl_abi_d_off;
383 d->d_reclen = nacl_d->nacl_abi_d_reclen + d_name_shift;
384 size_t d_name_len =
385 nacl_d->nacl_abi_d_reclen - offsetof(nacl_abi_dirent, nacl_abi_d_name);
386 memcpy(d->d_name, nacl_d->nacl_abi_d_name, d_name_len);
387
388 offset += d->d_reclen;
389 offset += nacl_d->nacl_abi_d_reclen;
390 }
391
392 *nread = offset;
393 return 0;
394 }
395
396 int _real_isatty(int fd, int* result) {
397 *result = isatty(fd);
398 return *result ? 0 : -1;
399 }
400
401 int _real_lseek(int fd, int64_t offset, int whence, int64_t* new_offset) {
402 CHECK_REAL(seek);
403 nacl_abi_off_t nacl_new_offs;
404 int ret = REAL(seek)(fd, offset, whence, &nacl_new_offs);
405 *new_offset = static_cast<off_t>(nacl_new_offs);
406 return ret;
407 }
408
409 int _real_lstat(const char* path, struct stat* buf) {
410 struct nacl_abi_stat st;
411 CHECK_REAL(lstat);
412
413 int err = REAL(lstat)(path, (struct stat*)&st);
414 if (err) {
415 errno = err;
416 return -1;
417 }
418
419 nacl_stat_to_stat(&st, buf);
420 return 0;
421 }
422
423 int _real_mkdir(const char* pathname, mode_t mode) {
424 CHECK_REAL(mkdir);
425 return REAL(mkdir)(pathname, mode);
426 }
427
428 int _real_mmap(void** addr,
429 size_t length,
430 int prot,
431 int flags,
432 int fd,
433 int64_t offset) {
434 CHECK_REAL(mmap);
435 return REAL(mmap)(addr, length, prot, flags, fd, offset);
436 }
437
438 int _real_munmap(void* addr, size_t length) {
439 CHECK_REAL(munmap);
440 return REAL(munmap)(addr, length);
441 }
442
443 int _real_open(const char* pathname, int oflag, mode_t mode, int* newfd) {
444 CHECK_REAL(open);
445 return REAL(open)(pathname, oflag, mode, newfd);
446 }
447
448 int _real_open_resource(const char* file, int* fd) {
449 CHECK_REAL(open_resource);
450 return REAL(open_resource)(file, fd);
451 }
452
453 int _real_read(int fd, void* buf, size_t count, size_t* nread) {
454 CHECK_REAL(read);
455 return REAL(read)(fd, buf, count, nread);
456 }
457
458 int _real_readlink(const char* path, char* buf, size_t count, size_t* nread) {
459 CHECK_REAL(readlink);
460 return REAL(readlink)(path, buf, count, nread);
461 }
462
463 int _real_rmdir(const char* pathname) {
464 CHECK_REAL(rmdir);
465 return REAL(rmdir)(pathname);
466 }
467
468 int _real_truncate(const char* pathname, int64_t len) {
469 CHECK_REAL(truncate);
470 return REAL(truncate)(pathname, len);
471 }
472
473 int _real_write(int fd, const void* buf, size_t count, size_t* nwrote) {
474 CHECK_REAL(write);
475 return REAL(write)(fd, buf, count, nwrote);
476 }
477
478 int _real_getcwd(char* pathname, size_t len) {
479 CHECK_REAL(getcwd);
480 return REAL(getcwd)(pathname, len);
481 }
482
483 static bool s_wrapped = false;
484
485 void kernel_wrap_init() {
486 if (!s_wrapped) {
487 assign_real_pointers();
488 EXPAND_SYMBOL_LIST_OPERATION(USE_WRAP)
489 s_wrapped = true;
490 }
491 }
492
493 void kernel_wrap_uninit() {
494 if (s_wrapped) {
495 EXPAND_SYMBOL_LIST_OPERATION(USE_REAL)
496 s_wrapped = false;
497 }
498 }
499
500 EXTERN_C_END
501
502 #endif // defined(__native_client__) && defined(__BIONIC__)