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 77extern char** environ; 78 79extern __noreturn void _exit(int __status); 80 81extern pid_t fork(void); 82extern pid_t vfork(void); 83extern pid_t getpid(void); 84extern pid_t gettid(void) __pure2; 85extern pid_t getpgid(pid_t __pid); 86extern int setpgid(pid_t __pid, pid_t __pgid); 87extern pid_t getppid(void); 88extern pid_t getpgrp(void); 89extern int setpgrp(void); 90extern pid_t getsid(pid_t __pid) __INTRODUCED_IN(21); 91extern pid_t setsid(void); 92 93extern int execv(const char* __path, char* const* __argv); 94extern int execvp(const char* __file, char* const* __argv); 95extern int execvpe(const char* __file, char* const* __argv, char* const* __envp) 96 __INTRODUCED_IN(21); 97extern int execve(const char* __file, char* const* __argv, char* const* __envp); 98extern int execl(const char* __path, const char* __arg0, ...); 99extern int execlp(const char* __file, const char* __arg0, ...); 100extern int execle(const char* __path, const char* __arg0, ...); 101 102extern int nice(int __incr); 103 104extern int setuid(uid_t __uid); 105extern uid_t getuid(void); 106extern int seteuid(uid_t __uid); 107extern uid_t geteuid(void); 108extern int setgid(gid_t __gid); 109extern gid_t getgid(void); 110extern int setegid(gid_t __gid); 111extern gid_t getegid(void); 112extern int getgroups(int __size, gid_t* __list); 113extern int setgroups(size_t __size, const gid_t* __list); 114extern int setreuid(uid_t __ruid, uid_t __euid); 115extern int setregid(gid_t __rgid, gid_t __egid); 116extern int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid); 117extern int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid); 118extern int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid); 119extern int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid); 120extern char* getlogin(void); 121 122extern long fpathconf(int __fd, int __name); 123extern long pathconf(const char* __path, int __name); 124 125extern int access(const char* __path, int __mode); 126extern int faccessat(int __dirfd, const char* __path, int __mode, int __flags) 127 __INTRODUCED_IN(21); 128extern int link(const char* __oldpath, const char* __newpath); 129extern int linkat(int __olddirfd, const char* __oldpath, int __newdirfd, 130 const char* __newpath, int __flags) __INTRODUCED_IN(21); 131extern int unlink(const char* __path); 132extern int unlinkat(int __dirfd, const char* __path, int __flags); 133extern int chdir(const char* __path); 134extern int fchdir(int __fd); 135extern int rmdir(const char* __path); 136extern int pipe(int* __pipefd); 137#if defined(__USE_GNU) 138extern int pipe2(int* __pipefd, int __flags) __INTRODUCED_IN(9); 139#endif 140extern int chroot(const char* __path); 141extern int symlink(const char* __oldpath, const char* __newpath); 142extern int symlinkat(const char* __oldpath, int __newdirfd, 143 const char* __newpath) __INTRODUCED_IN(21); 144extern ssize_t readlink(const char* __path, char* __buf, size_t __bufsiz); 145extern ssize_t readlinkat(int __dirfd, const char* __path, char* __buf, 146 size_t __bufsiz) __INTRODUCED_IN(21); 147extern int chown(const char* __path, uid_t __owner, gid_t __group); 148extern int fchown(int __fd, uid_t __owner, gid_t __group); 149extern int fchownat(int __dirfd, const char* __path, uid_t __owner, 150 gid_t __group, int __flags); 151extern int lchown(const char* __path, uid_t __owner, gid_t __group); 152extern char* getcwd(char* __buf, size_t __size); 153 154extern int sync(void); 155 156extern int close(int __fd); 157 158extern ssize_t read(int __fd, void* __buf, size_t __count); 159extern ssize_t write(int __fd, const void* __buf, size_t __count); 160 161extern int dup(int __oldfd); 162extern int dup2(int __oldfd, int __newfd); 163extern int dup3(int __oldfd, int __newfd, int __flags) __INTRODUCED_IN(21); 164extern int fcntl(int __fd, int __cmd, ...); 165extern int ioctl(int __fd, int __request, ...); 166extern int fsync(int __fd); 167extern int fdatasync(int __fd) __INTRODUCED_IN(9); 168 169#if defined(__USE_FILE_OFFSET64) 170extern off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64); 171#else 172extern off_t lseek(int __fd, off_t __offset, int __whence); 173#endif 174 175extern off64_t lseek64(int __fd, off64_t __offset, int __whence); 176 177#if defined(__USE_FILE_OFFSET64) && __ANDROID_API__ >= 21 178extern int truncate(const char* __path, off_t __length) __RENAME(truncate64); 179extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset) 180 __RENAME(pread64); 181extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, 182 off_t __offset) __RENAME(pwrite64); 183extern int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64); 184#else 185extern int truncate(const char* __path, off_t __length); 186extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset); 187extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, 188 off_t __offset); 189extern int ftruncate(int __fd, off_t __length); 190#endif 191 192extern int truncate64(const char* __path, off64_t __length) __INTRODUCED_IN(21); 193extern ssize_t pread64(int __fd, void* __buf, size_t __count, off64_t __offset) __INTRODUCED_IN(21); 194extern ssize_t pwrite64(int __fd, const void* __buf, size_t __count, 195 off64_t __offset) __INTRODUCED_IN(21); 196extern int ftruncate64(int __fd, off64_t __length) __INTRODUCED_IN(21); 197 198extern int pause(void); 199extern unsigned int alarm(unsigned int __seconds); 200extern unsigned int sleep(unsigned int __seconds); 201extern int usleep(useconds_t __usec); 202 203int gethostname(char* __name, size_t __len); 204int sethostname(const char* __name, size_t __len); 205 206extern void* __brk(void* __addr); 207extern int brk(void* __addr); 208extern void* sbrk(ptrdiff_t __increment); 209 210extern int getopt(int __argc, char* const* __argv, const char* __argstring); 211extern char* optarg; 212extern int optind, opterr, optopt; 213 214extern int isatty(int __fd); 215extern char* ttyname(int __fd); 216extern int ttyname_r(int __fd, char* __buf, size_t __buflen) __INTRODUCED_IN(8); 217 218extern int acct(const char* __filepath); 219 220long sysconf(int __name); 221 222#if __ANDROID_API__ >= 21 223int getpagesize(void); 224#else 225__inline__ int getpagesize(void) { 226 return sysconf(_SC_PAGESIZE); 227} 228#endif 229 230long syscall(long __number, ...); 231 232extern int daemon(int __nochdir, int __noclose); 233 234#if defined(__arm__) || (defined(__mips__) && !defined(__LP64__)) 235extern int cacheflush(long __addr, long __nbytes, long __cache); 236 /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */ 237#endif 238 239extern pid_t tcgetpgrp(int __fd); 240extern 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. */ 251extern char* __getcwd_chk(char*, size_t, size_t); 252__errordecl(__getcwd_dest_size_error, "getcwd called with size bigger than destination"); 253extern char* __getcwd_real(char*, size_t) __RENAME(getcwd); 254 255extern 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"); 258extern ssize_t __pread_real(int, void*, size_t, off_t) __RENAME(pread); 259 260extern 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"); 263extern ssize_t __pread64_real(int, void*, size_t, off64_t) __RENAME(pread64); 264 265extern 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"); 268extern ssize_t __pwrite_real(int, const void*, size_t, off_t) __RENAME(pwrite); 269 270extern 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"); 273extern ssize_t __pwrite64_real(int, const void*, size_t, off64_t) __RENAME(pwrite64); 274 275extern 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"); 278extern ssize_t __read_real(int, void*, size_t) __RENAME(read); 279 280extern 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"); 283extern ssize_t __write_real(int, const void*, size_t) __RENAME(write); 284 285extern 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"); 288extern ssize_t __readlink_real(const char*, char*, size_t) __RENAME(readlink); 289 290extern 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"); 293extern ssize_t __readlinkat_real(int dirfd, const char*, char*, size_t) __RENAME(readlinkat); 294 295#if defined(__BIONIC_FORTIFY) 296 297__BIONIC_FORTIFY_INLINE 298char* 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 335ssize_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 360ssize_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 391ssize_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 416ssize_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 441ssize_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 466ssize_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 493ssize_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 518ssize_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