1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _UNISTD_H_ 30 #define _UNISTD_H_ 31 32 #include <stddef.h> 33 #include <sys/cdefs.h> 34 #include <sys/types.h> 35 #include <sys/select.h> 36 #include <sys/sysconf.h> 37 38 #include <bits/lockf.h> 39 #include <bits/posix_limits.h> 40 41 __BEGIN_DECLS 42 43 #define STDIN_FILENO 0 44 #define STDOUT_FILENO 1 45 #define STDERR_FILENO 2 46 47 #define F_OK 0 48 #define X_OK 1 49 #define W_OK 2 50 #define R_OK 4 51 52 #define SEEK_SET 0 53 #define SEEK_CUR 1 54 #define SEEK_END 2 55 56 #define _PC_FILESIZEBITS 0 57 #define _PC_LINK_MAX 1 58 #define _PC_MAX_CANON 2 59 #define _PC_MAX_INPUT 3 60 #define _PC_NAME_MAX 4 61 #define _PC_PATH_MAX 5 62 #define _PC_PIPE_BUF 6 63 #define _PC_2_SYMLINKS 7 64 #define _PC_ALLOC_SIZE_MIN 8 65 #define _PC_REC_INCR_XFER_SIZE 9 66 #define _PC_REC_MAX_XFER_SIZE 10 67 #define _PC_REC_MIN_XFER_SIZE 11 68 #define _PC_REC_XFER_ALIGN 12 69 #define _PC_SYMLINK_MAX 13 70 #define _PC_CHOWN_RESTRICTED 14 71 #define _PC_NO_TRUNC 15 72 #define _PC_VDISABLE 16 73 #define _PC_ASYNC_IO 17 74 #define _PC_PRIO_IO 18 75 #define _PC_SYNC_IO 19 76 77 extern char** environ; 78 79 extern __noreturn void _exit(int __status); 80 81 extern pid_t fork(void); 82 extern pid_t vfork(void); 83 extern pid_t getpid(void); 84 extern pid_t gettid(void) __pure2; 85 extern pid_t getpgid(pid_t __pid); 86 extern int setpgid(pid_t __pid, pid_t __pgid); 87 extern pid_t getppid(void); 88 extern pid_t getpgrp(void); 89 extern int setpgrp(void); 90 extern pid_t getsid(pid_t __pid) __INTRODUCED_IN(21); 91 extern pid_t setsid(void); 92 93 extern int execv(const char* __path, char* const* __argv); 94 extern int execvp(const char* __file, char* const* __argv); 95 extern int execvpe(const char* __file, char* const* __argv, char* const* __envp) 96 __INTRODUCED_IN(21); 97 extern int execve(const char* __file, char* const* __argv, char* const* __envp); 98 extern int execl(const char* __path, const char* __arg0, ...); 99 extern int execlp(const char* __file, const char* __arg0, ...); 100 extern int execle(const char* __path, const char* __arg0, ...); 101 102 extern int nice(int __incr); 103 104 extern int setuid(uid_t __uid); 105 extern uid_t getuid(void); 106 extern int seteuid(uid_t __uid); 107 extern uid_t geteuid(void); 108 extern int setgid(gid_t __gid); 109 extern gid_t getgid(void); 110 extern int setegid(gid_t __gid); 111 extern gid_t getegid(void); 112 extern int getgroups(int __size, gid_t* __list); 113 extern int setgroups(size_t __size, const gid_t* __list); 114 extern int setreuid(uid_t __ruid, uid_t __euid); 115 extern int setregid(gid_t __rgid, gid_t __egid); 116 extern int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid); 117 extern int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid); 118 extern int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid); 119 extern int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid); 120 extern char* getlogin(void); 121 122 extern long fpathconf(int __fd, int __name); 123 extern long pathconf(const char* __path, int __name); 124 125 extern int access(const char* __path, int __mode); 126 extern int faccessat(int __dirfd, const char* __path, int __mode, int __flags) 127 __INTRODUCED_IN(21); 128 extern int link(const char* __oldpath, const char* __newpath); 129 extern int linkat(int __olddirfd, const char* __oldpath, int __newdirfd, 130 const char* __newpath, int __flags) __INTRODUCED_IN(21); 131 extern int unlink(const char* __path); 132 extern int unlinkat(int __dirfd, const char* __path, int __flags); 133 extern int chdir(const char* __path); 134 extern int fchdir(int __fd); 135 extern int rmdir(const char* __path); 136 extern int pipe(int* __pipefd); 137 #if defined(__USE_GNU) 138 extern int pipe2(int* __pipefd, int __flags) __INTRODUCED_IN(9); 139 #endif 140 extern int chroot(const char* __path); 141 extern int symlink(const char* __oldpath, const char* __newpath); 142 extern int symlinkat(const char* __oldpath, int __newdirfd, 143 const char* __newpath) __INTRODUCED_IN(21); 144 extern ssize_t readlink(const char* __path, char* __buf, size_t __bufsiz); 145 extern ssize_t readlinkat(int __dirfd, const char* __path, char* __buf, 146 size_t __bufsiz) __INTRODUCED_IN(21); 147 extern int chown(const char* __path, uid_t __owner, gid_t __group); 148 extern int fchown(int __fd, uid_t __owner, gid_t __group); 149 extern int fchownat(int __dirfd, const char* __path, uid_t __owner, 150 gid_t __group, int __flags); 151 extern int lchown(const char* __path, uid_t __owner, gid_t __group); 152 extern char* getcwd(char* __buf, size_t __size); 153 154 extern int sync(void); 155 156 extern int close(int __fd); 157 158 extern ssize_t read(int __fd, void* __buf, size_t __count); 159 extern ssize_t write(int __fd, const void* __buf, size_t __count); 160 161 extern int dup(int __oldfd); 162 extern int dup2(int __oldfd, int __newfd); 163 extern int dup3(int __oldfd, int __newfd, int __flags) __INTRODUCED_IN(21); 164 extern int fcntl(int __fd, int __cmd, ...); 165 extern int ioctl(int __fd, int __request, ...); 166 extern int fsync(int __fd); 167 extern int fdatasync(int __fd) __INTRODUCED_IN(9); 168 169 #if defined(__USE_FILE_OFFSET64) 170 extern off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64); 171 #else 172 extern off_t lseek(int __fd, off_t __offset, int __whence); 173 #endif 174 175 extern off64_t lseek64(int __fd, off64_t __offset, int __whence); 176 177 #if defined(__USE_FILE_OFFSET64) && __ANDROID_API__ >= 21 178 extern int truncate(const char* __path, off_t __length) __RENAME(truncate64); 179 extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset) 180 __RENAME(pread64); 181 extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, 182 off_t __offset) __RENAME(pwrite64); 183 extern int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64); 184 #else 185 extern int truncate(const char* __path, off_t __length); 186 extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset); 187 extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, 188 off_t __offset); 189 extern int ftruncate(int __fd, off_t __length); 190 #endif 191 192 extern int truncate64(const char* __path, off64_t __length) __INTRODUCED_IN(21); 193 extern ssize_t pread64(int __fd, void* __buf, size_t __count, off64_t __offset) __INTRODUCED_IN(21); 194 extern ssize_t pwrite64(int __fd, const void* __buf, size_t __count, 195 off64_t __offset) __INTRODUCED_IN(21); 196 extern int ftruncate64(int __fd, off64_t __length) __INTRODUCED_IN(21); 197 198 extern int pause(void); 199 extern unsigned int alarm(unsigned int __seconds); 200 extern unsigned int sleep(unsigned int __seconds); 201 extern int usleep(useconds_t __usec); 202 203 int gethostname(char* __name, size_t __len); 204 int sethostname(const char* __name, size_t __len); 205 206 extern void* __brk(void* __addr); 207 extern int brk(void* __addr); 208 extern void* sbrk(ptrdiff_t __increment); 209 210 extern int getopt(int __argc, char* const* __argv, const char* __argstring); 211 extern char* optarg; 212 extern int optind, opterr, optopt; 213 214 extern int isatty(int __fd); 215 extern char* ttyname(int __fd); 216 extern int ttyname_r(int __fd, char* __buf, size_t __buflen) __INTRODUCED_IN(8); 217 218 extern int acct(const char* __filepath); 219 220 long sysconf(int __name); 221 222 #if __ANDROID_API__ >= 21 223 int getpagesize(void); 224 #else 225 __inline__ int getpagesize(void) { 226 return sysconf(_SC_PAGESIZE); 227 } 228 #endif 229 230 long syscall(long __number, ...); 231 232 extern int daemon(int __nochdir, int __noclose); 233 234 #if defined(__arm__) || (defined(__mips__) && !defined(__LP64__)) 235 extern int cacheflush(long __addr, long __nbytes, long __cache); 236 /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */ 237 #endif 238 239 extern pid_t tcgetpgrp(int __fd); 240 extern int tcsetpgrp(int __fd, pid_t __pid); 241 242 /* Used to retry syscalls that can return EINTR. */ 243 #define TEMP_FAILURE_RETRY(exp) ({ \ 244 __typeof__(exp) _rc; \ 245 do { \ 246 _rc = (exp); \ 247 } while (_rc == -1 && errno == EINTR); \ 248 _rc; }) 249 250 /* TODO(unified-headers): Factor out all the FORTIFY features. */ 251 extern char* __getcwd_chk(char*, size_t, size_t); 252 __errordecl(__getcwd_dest_size_error, "getcwd called with size bigger than destination"); 253 extern char* __getcwd_real(char*, size_t) __RENAME(getcwd); 254 255 extern ssize_t __pread_chk(int, void*, size_t, off_t, size_t); 256 __errordecl(__pread_dest_size_error, "pread called with size bigger than destination"); 257 __errordecl(__pread_count_toobig_error, "pread called with count > SSIZE_MAX"); 258 extern ssize_t __pread_real(int, void*, size_t, off_t) __RENAME(pread); 259 260 extern ssize_t __pread64_chk(int, void*, size_t, off64_t, size_t); 261 __errordecl(__pread64_dest_size_error, "pread64 called with size bigger than destination"); 262 __errordecl(__pread64_count_toobig_error, "pread64 called with count > SSIZE_MAX"); 263 extern ssize_t __pread64_real(int, void*, size_t, off64_t) __RENAME(pread64); 264 265 extern ssize_t __pwrite_chk(int, const void*, size_t, off_t, size_t); 266 __errordecl(__pwrite_dest_size_error, "pwrite called with size bigger than destination"); 267 __errordecl(__pwrite_count_toobig_error, "pwrite called with count > SSIZE_MAX"); 268 extern ssize_t __pwrite_real(int, const void*, size_t, off_t) __RENAME(pwrite); 269 270 extern ssize_t __pwrite64_chk(int, const void*, size_t, off64_t, size_t); 271 __errordecl(__pwrite64_dest_size_error, "pwrite64 called with size bigger than destination"); 272 __errordecl(__pwrite64_count_toobig_error, "pwrite64 called with count > SSIZE_MAX"); 273 extern ssize_t __pwrite64_real(int, const void*, size_t, off64_t) __RENAME(pwrite64); 274 275 extern ssize_t __read_chk(int, void*, size_t, size_t); 276 __errordecl(__read_dest_size_error, "read called with size bigger than destination"); 277 __errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX"); 278 extern ssize_t __read_real(int, void*, size_t) __RENAME(read); 279 280 extern ssize_t __write_chk(int, const void*, size_t, size_t); 281 __errordecl(__write_dest_size_error, "write called with size bigger than destination"); 282 __errordecl(__write_count_toobig_error, "write called with count > SSIZE_MAX"); 283 extern ssize_t __write_real(int, const void*, size_t) __RENAME(write); 284 285 extern ssize_t __readlink_chk(const char*, char*, size_t, size_t); 286 __errordecl(__readlink_dest_size_error, "readlink called with size bigger than destination"); 287 __errordecl(__readlink_size_toobig_error, "readlink called with size > SSIZE_MAX"); 288 extern ssize_t __readlink_real(const char*, char*, size_t) __RENAME(readlink); 289 290 extern ssize_t __readlinkat_chk(int dirfd, const char*, char*, size_t, size_t); 291 __errordecl(__readlinkat_dest_size_error, "readlinkat called with size bigger than destination"); 292 __errordecl(__readlinkat_size_toobig_error, "readlinkat called with size > SSIZE_MAX"); 293 extern ssize_t __readlinkat_real(int dirfd, const char*, char*, size_t) __RENAME(readlinkat); 294 295 #if defined(__BIONIC_FORTIFY) 296 297 __BIONIC_FORTIFY_INLINE 298 char* getcwd(char* buf, size_t size) { 299 size_t bos = __bos(buf); 300 301 #if defined(__clang__) 302 /* 303 * Work around LLVM's incorrect __builtin_object_size implementation here 304 * to avoid needing the workaround in the __getcwd_chk ABI forever. 305 * 306 * https://llvm.org/bugs/show_bug.cgi?id=23277 307 */ 308 if (buf == NULL) { 309 bos = __BIONIC_FORTIFY_UNKNOWN_SIZE; 310 } 311 #else 312 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 313 return __getcwd_real(buf, size); 314 } 315 316 if (__builtin_constant_p(size) && (size > bos)) { 317 __getcwd_dest_size_error(); 318 } 319 320 if (__builtin_constant_p(size) && (size <= bos)) { 321 return __getcwd_real(buf, size); 322 } 323 #endif 324 325 return __getcwd_chk(buf, size, bos); 326 } 327 328 #if defined(__USE_FILE_OFFSET64) 329 #define __PREAD_PREFIX(x) __pread64_ ## x 330 #else 331 #define __PREAD_PREFIX(x) __pread_ ## x 332 #endif 333 334 __BIONIC_FORTIFY_INLINE 335 ssize_t pread(int fd, void* buf, size_t count, off_t offset) { 336 size_t bos = __bos0(buf); 337 338 #if !defined(__clang__) 339 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 340 __PREAD_PREFIX(count_toobig_error)(); 341 } 342 343 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 344 return __PREAD_PREFIX(real)(fd, buf, count, offset); 345 } 346 347 if (__builtin_constant_p(count) && (count > bos)) { 348 __PREAD_PREFIX(dest_size_error)(); 349 } 350 351 if (__builtin_constant_p(count) && (count <= bos)) { 352 return __PREAD_PREFIX(real)(fd, buf, count, offset); 353 } 354 #endif 355 356 return __PREAD_PREFIX(chk)(fd, buf, count, offset, bos); 357 } 358 359 __BIONIC_FORTIFY_INLINE 360 ssize_t pread64(int fd, void* buf, size_t count, off64_t offset) { 361 size_t bos = __bos0(buf); 362 363 #if !defined(__clang__) 364 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 365 __pread64_count_toobig_error(); 366 } 367 368 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 369 return __pread64_real(fd, buf, count, offset); 370 } 371 372 if (__builtin_constant_p(count) && (count > bos)) { 373 __pread64_dest_size_error(); 374 } 375 376 if (__builtin_constant_p(count) && (count <= bos)) { 377 return __pread64_real(fd, buf, count, offset); 378 } 379 #endif 380 381 return __pread64_chk(fd, buf, count, offset, bos); 382 } 383 384 #if defined(__USE_FILE_OFFSET64) 385 #define __PWRITE_PREFIX(x) __pwrite64_ ## x 386 #else 387 #define __PWRITE_PREFIX(x) __pwrite_ ## x 388 #endif 389 390 __BIONIC_FORTIFY_INLINE 391 ssize_t pwrite(int fd, const void* buf, size_t count, off_t offset) { 392 size_t bos = __bos0(buf); 393 394 #if !defined(__clang__) 395 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 396 __PWRITE_PREFIX(count_toobig_error)(); 397 } 398 399 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 400 return __PWRITE_PREFIX(real)(fd, buf, count, offset); 401 } 402 403 if (__builtin_constant_p(count) && (count > bos)) { 404 __PWRITE_PREFIX(dest_size_error)(); 405 } 406 407 if (__builtin_constant_p(count) && (count <= bos)) { 408 return __PWRITE_PREFIX(real)(fd, buf, count, offset); 409 } 410 #endif 411 412 return __PWRITE_PREFIX(chk)(fd, buf, count, offset, bos); 413 } 414 415 __BIONIC_FORTIFY_INLINE 416 ssize_t pwrite64(int fd, const void* buf, size_t count, off64_t offset) { 417 size_t bos = __bos0(buf); 418 419 #if !defined(__clang__) 420 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 421 __pwrite64_count_toobig_error(); 422 } 423 424 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 425 return __pwrite64_real(fd, buf, count, offset); 426 } 427 428 if (__builtin_constant_p(count) && (count > bos)) { 429 __pwrite64_dest_size_error(); 430 } 431 432 if (__builtin_constant_p(count) && (count <= bos)) { 433 return __pwrite64_real(fd, buf, count, offset); 434 } 435 #endif 436 437 return __pwrite64_chk(fd, buf, count, offset, bos); 438 } 439 440 __BIONIC_FORTIFY_INLINE 441 ssize_t read(int fd, void* buf, size_t count) { 442 size_t bos = __bos0(buf); 443 444 #if !defined(__clang__) 445 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 446 __read_count_toobig_error(); 447 } 448 449 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 450 return __read_real(fd, buf, count); 451 } 452 453 if (__builtin_constant_p(count) && (count > bos)) { 454 __read_dest_size_error(); 455 } 456 457 if (__builtin_constant_p(count) && (count <= bos)) { 458 return __read_real(fd, buf, count); 459 } 460 #endif 461 462 return __read_chk(fd, buf, count, bos); 463 } 464 465 __BIONIC_FORTIFY_INLINE 466 ssize_t write(int fd, const void* buf, size_t count) { 467 size_t bos = __bos0(buf); 468 469 #if !defined(__clang__) 470 #if 0 /* work around a false positive due to a missed optimization */ 471 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 472 __write_count_toobig_error(); 473 } 474 #endif 475 476 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 477 return __write_real(fd, buf, count); 478 } 479 480 if (__builtin_constant_p(count) && (count > bos)) { 481 __write_dest_size_error(); 482 } 483 484 if (__builtin_constant_p(count) && (count <= bos)) { 485 return __write_real(fd, buf, count); 486 } 487 #endif 488 489 return __write_chk(fd, buf, count, bos); 490 } 491 492 __BIONIC_FORTIFY_INLINE 493 ssize_t readlink(const char* path, char* buf, size_t size) { 494 size_t bos = __bos(buf); 495 496 #if !defined(__clang__) 497 if (__builtin_constant_p(size) && (size > SSIZE_MAX)) { 498 __readlink_size_toobig_error(); 499 } 500 501 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 502 return __readlink_real(path, buf, size); 503 } 504 505 if (__builtin_constant_p(size) && (size > bos)) { 506 __readlink_dest_size_error(); 507 } 508 509 if (__builtin_constant_p(size) && (size <= bos)) { 510 return __readlink_real(path, buf, size); 511 } 512 #endif 513 514 return __readlink_chk(path, buf, size, bos); 515 } 516 517 __BIONIC_FORTIFY_INLINE 518 ssize_t readlinkat(int dirfd, const char* path, char* buf, size_t size) { 519 size_t bos = __bos(buf); 520 521 #if !defined(__clang__) 522 if (__builtin_constant_p(size) && (size > SSIZE_MAX)) { 523 __readlinkat_size_toobig_error(); 524 } 525 526 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 527 return __readlinkat_real(dirfd, path, buf, size); 528 } 529 530 if (__builtin_constant_p(size) && (size > bos)) { 531 __readlinkat_dest_size_error(); 532 } 533 534 if (__builtin_constant_p(size) && (size <= bos)) { 535 return __readlinkat_real(dirfd, path, buf, size); 536 } 537 #endif 538 539 return __readlinkat_chk(dirfd, path, buf, size, bos); 540 } 541 542 #endif /* defined(__BIONIC_FORTIFY) */ 543 544 __END_DECLS 545 546 #endif /* _UNISTD_H_ */ 547
