/* * Copyright (C) 2008 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _UNISTD_H_ #define _UNISTD_H_ #include #include #include #include #include #include __BEGIN_DECLS #define STDIN_FILENO 0 #define STDOUT_FILENO 1 #define STDERR_FILENO 2 #define F_OK 0 #define X_OK 1 #define W_OK 2 #define R_OK 4 #define SEEK_SET 0 #define SEEK_CUR 1 #define SEEK_END 2 #define _PC_FILESIZEBITS 0 #define _PC_LINK_MAX 1 #define _PC_MAX_CANON 2 #define _PC_MAX_INPUT 3 #define _PC_NAME_MAX 4 #define _PC_PATH_MAX 5 #define _PC_PIPE_BUF 6 #define _PC_2_SYMLINKS 7 #define _PC_ALLOC_SIZE_MIN 8 #define _PC_REC_INCR_XFER_SIZE 9 #define _PC_REC_MAX_XFER_SIZE 10 #define _PC_REC_MIN_XFER_SIZE 11 #define _PC_REC_XFER_ALIGN 12 #define _PC_SYMLINK_MAX 13 #define _PC_CHOWN_RESTRICTED 14 #define _PC_NO_TRUNC 15 #define _PC_VDISABLE 16 #define _PC_ASYNC_IO 17 #define _PC_PRIO_IO 18 #define _PC_SYNC_IO 19 extern char** environ; extern __noreturn void _exit(int __status); extern pid_t fork(void); extern pid_t vfork(void); extern pid_t getpid(void); extern pid_t gettid(void) __pure2; extern pid_t getpgid(pid_t __pid); extern int setpgid(pid_t __pid, pid_t __pgid); extern pid_t getppid(void); extern pid_t getpgrp(void); extern int setpgrp(void); extern pid_t getsid(pid_t __pid) __INTRODUCED_IN(21); extern pid_t setsid(void); extern int execv(const char* __path, char* const* __argv); extern int execvp(const char* __file, char* const* __argv); extern int execvpe(const char* __file, char* const* __argv, char* const* __envp) __INTRODUCED_IN(21); extern int execve(const char* __file, char* const* __argv, char* const* __envp); extern int execl(const char* __path, const char* __arg0, ...); extern int execlp(const char* __file, const char* __arg0, ...); extern int execle(const char* __path, const char* __arg0, ...); extern int nice(int __incr); extern int setuid(uid_t __uid); extern uid_t getuid(void); extern int seteuid(uid_t __uid); extern uid_t geteuid(void); extern int setgid(gid_t __gid); extern gid_t getgid(void); extern int setegid(gid_t __gid); extern gid_t getegid(void); extern int getgroups(int __size, gid_t* __list); extern int setgroups(size_t __size, const gid_t* __list); extern int setreuid(uid_t __ruid, uid_t __euid); extern int setregid(gid_t __rgid, gid_t __egid); extern int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid); extern int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid); extern int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid); extern int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid); extern char* getlogin(void); extern long fpathconf(int __fd, int __name); extern long pathconf(const char* __path, int __name); extern int access(const char* __path, int __mode); extern int faccessat(int __dirfd, const char* __path, int __mode, int __flags) __INTRODUCED_IN(21); extern int link(const char* __oldpath, const char* __newpath); extern int linkat(int __olddirfd, const char* __oldpath, int __newdirfd, const char* __newpath, int __flags) __INTRODUCED_IN(21); extern int unlink(const char* __path); extern int unlinkat(int __dirfd, const char* __path, int __flags); extern int chdir(const char* __path); extern int fchdir(int __fd); extern int rmdir(const char* __path); extern int pipe(int* __pipefd); #if defined(__USE_GNU) extern int pipe2(int* __pipefd, int __flags) __INTRODUCED_IN(9); #endif extern int chroot(const char* __path); extern int symlink(const char* __oldpath, const char* __newpath); extern int symlinkat(const char* __oldpath, int __newdirfd, const char* __newpath) __INTRODUCED_IN(21); extern ssize_t readlink(const char* __path, char* __buf, size_t __bufsiz); extern ssize_t readlinkat(int __dirfd, const char* __path, char* __buf, size_t __bufsiz) __INTRODUCED_IN(21); extern int chown(const char* __path, uid_t __owner, gid_t __group); extern int fchown(int __fd, uid_t __owner, gid_t __group); extern int fchownat(int __dirfd, const char* __path, uid_t __owner, gid_t __group, int __flags); extern int lchown(const char* __path, uid_t __owner, gid_t __group); extern char* getcwd(char* __buf, size_t __size); extern int sync(void); extern int close(int __fd); extern ssize_t read(int __fd, void* __buf, size_t __count); extern ssize_t write(int __fd, const void* __buf, size_t __count); extern int dup(int __oldfd); extern int dup2(int __oldfd, int __newfd); extern int dup3(int __oldfd, int __newfd, int __flags) __INTRODUCED_IN(21); extern int fcntl(int __fd, int __cmd, ...); extern int ioctl(int __fd, int __request, ...); extern int fsync(int __fd); extern int fdatasync(int __fd) __INTRODUCED_IN(9); #if defined(__USE_FILE_OFFSET64) extern off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64); #else extern off_t lseek(int __fd, off_t __offset, int __whence); #endif extern off64_t lseek64(int __fd, off64_t __offset, int __whence); #if defined(__USE_FILE_OFFSET64) && __ANDROID_API__ >= 21 extern int truncate(const char* __path, off_t __length) __RENAME(truncate64); extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset) __RENAME(pread64); extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset) __RENAME(pwrite64); extern int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64); #else extern int truncate(const char* __path, off_t __length); extern ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset); extern ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset); extern int ftruncate(int __fd, off_t __length); #endif extern int truncate64(const char* __path, off64_t __length) __INTRODUCED_IN(21); extern ssize_t pread64(int __fd, void* __buf, size_t __count, off64_t __offset) __INTRODUCED_IN(21); extern ssize_t pwrite64(int __fd, const void* __buf, size_t __count, off64_t __offset) __INTRODUCED_IN(21); extern int ftruncate64(int __fd, off64_t __length) __INTRODUCED_IN(21); extern int pause(void); extern unsigned int alarm(unsigned int __seconds); extern unsigned int sleep(unsigned int __seconds); extern int usleep(useconds_t __usec); int gethostname(char* __name, size_t __len); int sethostname(const char* __name, size_t __len); extern void* __brk(void* __addr); extern int brk(void* __addr); extern void* sbrk(ptrdiff_t __increment); extern int getopt(int __argc, char* const* __argv, const char* __argstring); extern char* optarg; extern int optind, opterr, optopt; extern int isatty(int __fd); extern char* ttyname(int __fd); extern int ttyname_r(int __fd, char* __buf, size_t __buflen) __INTRODUCED_IN(8); extern int acct(const char* __filepath); long sysconf(int __name); #if __ANDROID_API__ >= 21 int getpagesize(void); #else __inline__ int getpagesize(void) { return sysconf(_SC_PAGESIZE); } #endif long syscall(long __number, ...); extern int daemon(int __nochdir, int __noclose); #if defined(__arm__) || (defined(__mips__) && !defined(__LP64__)) extern int cacheflush(long __addr, long __nbytes, long __cache); /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */ #endif extern pid_t tcgetpgrp(int __fd); extern int tcsetpgrp(int __fd, pid_t __pid); /* Used to retry syscalls that can return EINTR. */ #define TEMP_FAILURE_RETRY(exp) ({ \ __typeof__(exp) _rc; \ do { \ _rc = (exp); \ } while (_rc == -1 && errno == EINTR); \ _rc; }) /* TODO(unified-headers): Factor out all the FORTIFY features. */ extern char* __getcwd_chk(char*, size_t, size_t); __errordecl(__getcwd_dest_size_error, "getcwd called with size bigger than destination"); extern char* __getcwd_real(char*, size_t) __RENAME(getcwd); extern ssize_t __pread_chk(int, void*, size_t, off_t, size_t); __errordecl(__pread_dest_size_error, "pread called with size bigger than destination"); __errordecl(__pread_count_toobig_error, "pread called with count > SSIZE_MAX"); extern ssize_t __pread_real(int, void*, size_t, off_t) __RENAME(pread); extern ssize_t __pread64_chk(int, void*, size_t, off64_t, size_t); __errordecl(__pread64_dest_size_error, "pread64 called with size bigger than destination"); __errordecl(__pread64_count_toobig_error, "pread64 called with count > SSIZE_MAX"); extern ssize_t __pread64_real(int, void*, size_t, off64_t) __RENAME(pread64); extern ssize_t __pwrite_chk(int, const void*, size_t, off_t, size_t); __errordecl(__pwrite_dest_size_error, "pwrite called with size bigger than destination"); __errordecl(__pwrite_count_toobig_error, "pwrite called with count > SSIZE_MAX"); extern ssize_t __pwrite_real(int, const void*, size_t, off_t) __RENAME(pwrite); extern ssize_t __pwrite64_chk(int, const void*, size_t, off64_t, size_t); __errordecl(__pwrite64_dest_size_error, "pwrite64 called with size bigger than destination"); __errordecl(__pwrite64_count_toobig_error, "pwrite64 called with count > SSIZE_MAX"); extern ssize_t __pwrite64_real(int, const void*, size_t, off64_t) __RENAME(pwrite64); extern ssize_t __read_chk(int, void*, size_t, size_t); __errordecl(__read_dest_size_error, "read called with size bigger than destination"); __errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX"); extern ssize_t __read_real(int, void*, size_t) __RENAME(read); extern ssize_t __write_chk(int, const void*, size_t, size_t); __errordecl(__write_dest_size_error, "write called with size bigger than destination"); __errordecl(__write_count_toobig_error, "write called with count > SSIZE_MAX"); extern ssize_t __write_real(int, const void*, size_t) __RENAME(write); extern ssize_t __readlink_chk(const char*, char*, size_t, size_t); __errordecl(__readlink_dest_size_error, "readlink called with size bigger than destination"); __errordecl(__readlink_size_toobig_error, "readlink called with size > SSIZE_MAX"); extern ssize_t __readlink_real(const char*, char*, size_t) __RENAME(readlink); extern ssize_t __readlinkat_chk(int dirfd, const char*, char*, size_t, size_t); __errordecl(__readlinkat_dest_size_error, "readlinkat called with size bigger than destination"); __errordecl(__readlinkat_size_toobig_error, "readlinkat called with size > SSIZE_MAX"); extern ssize_t __readlinkat_real(int dirfd, const char*, char*, size_t) __RENAME(readlinkat); #if defined(__BIONIC_FORTIFY) __BIONIC_FORTIFY_INLINE char* getcwd(char* buf, size_t size) { size_t bos = __bos(buf); #if defined(__clang__) /* * Work around LLVM's incorrect __builtin_object_size implementation here * to avoid needing the workaround in the __getcwd_chk ABI forever. * * https://llvm.org/bugs/show_bug.cgi?id=23277 */ if (buf == NULL) { bos = __BIONIC_FORTIFY_UNKNOWN_SIZE; } #else if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __getcwd_real(buf, size); } if (__builtin_constant_p(size) && (size > bos)) { __getcwd_dest_size_error(); } if (__builtin_constant_p(size) && (size <= bos)) { return __getcwd_real(buf, size); } #endif return __getcwd_chk(buf, size, bos); } #if defined(__USE_FILE_OFFSET64) #define __PREAD_PREFIX(x) __pread64_ ## x #else #define __PREAD_PREFIX(x) __pread_ ## x #endif __BIONIC_FORTIFY_INLINE ssize_t pread(int fd, void* buf, size_t count, off_t offset) { size_t bos = __bos0(buf); #if !defined(__clang__) if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __PREAD_PREFIX(count_toobig_error)(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __PREAD_PREFIX(real)(fd, buf, count, offset); } if (__builtin_constant_p(count) && (count > bos)) { __PREAD_PREFIX(dest_size_error)(); } if (__builtin_constant_p(count) && (count <= bos)) { return __PREAD_PREFIX(real)(fd, buf, count, offset); } #endif return __PREAD_PREFIX(chk)(fd, buf, count, offset, bos); } __BIONIC_FORTIFY_INLINE ssize_t pread64(int fd, void* buf, size_t count, off64_t offset) { size_t bos = __bos0(buf); #if !defined(__clang__) if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __pread64_count_toobig_error(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __pread64_real(fd, buf, count, offset); } if (__builtin_constant_p(count) && (count > bos)) { __pread64_dest_size_error(); } if (__builtin_constant_p(count) && (count <= bos)) { return __pread64_real(fd, buf, count, offset); } #endif return __pread64_chk(fd, buf, count, offset, bos); } #if defined(__USE_FILE_OFFSET64) #define __PWRITE_PREFIX(x) __pwrite64_ ## x #else #define __PWRITE_PREFIX(x) __pwrite_ ## x #endif __BIONIC_FORTIFY_INLINE ssize_t pwrite(int fd, const void* buf, size_t count, off_t offset) { size_t bos = __bos0(buf); #if !defined(__clang__) if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __PWRITE_PREFIX(count_toobig_error)(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __PWRITE_PREFIX(real)(fd, buf, count, offset); } if (__builtin_constant_p(count) && (count > bos)) { __PWRITE_PREFIX(dest_size_error)(); } if (__builtin_constant_p(count) && (count <= bos)) { return __PWRITE_PREFIX(real)(fd, buf, count, offset); } #endif return __PWRITE_PREFIX(chk)(fd, buf, count, offset, bos); } __BIONIC_FORTIFY_INLINE ssize_t pwrite64(int fd, const void* buf, size_t count, off64_t offset) { size_t bos = __bos0(buf); #if !defined(__clang__) if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __pwrite64_count_toobig_error(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __pwrite64_real(fd, buf, count, offset); } if (__builtin_constant_p(count) && (count > bos)) { __pwrite64_dest_size_error(); } if (__builtin_constant_p(count) && (count <= bos)) { return __pwrite64_real(fd, buf, count, offset); } #endif return __pwrite64_chk(fd, buf, count, offset, bos); } __BIONIC_FORTIFY_INLINE ssize_t read(int fd, void* buf, size_t count) { size_t bos = __bos0(buf); #if !defined(__clang__) if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __read_count_toobig_error(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __read_real(fd, buf, count); } if (__builtin_constant_p(count) && (count > bos)) { __read_dest_size_error(); } if (__builtin_constant_p(count) && (count <= bos)) { return __read_real(fd, buf, count); } #endif return __read_chk(fd, buf, count, bos); } __BIONIC_FORTIFY_INLINE ssize_t write(int fd, const void* buf, size_t count) { size_t bos = __bos0(buf); #if !defined(__clang__) #if 0 /* work around a false positive due to a missed optimization */ if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { __write_count_toobig_error(); } #endif if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __write_real(fd, buf, count); } if (__builtin_constant_p(count) && (count > bos)) { __write_dest_size_error(); } if (__builtin_constant_p(count) && (count <= bos)) { return __write_real(fd, buf, count); } #endif return __write_chk(fd, buf, count, bos); } __BIONIC_FORTIFY_INLINE ssize_t readlink(const char* path, char* buf, size_t size) { size_t bos = __bos(buf); #if !defined(__clang__) if (__builtin_constant_p(size) && (size > SSIZE_MAX)) { __readlink_size_toobig_error(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __readlink_real(path, buf, size); } if (__builtin_constant_p(size) && (size > bos)) { __readlink_dest_size_error(); } if (__builtin_constant_p(size) && (size <= bos)) { return __readlink_real(path, buf, size); } #endif return __readlink_chk(path, buf, size, bos); } __BIONIC_FORTIFY_INLINE ssize_t readlinkat(int dirfd, const char* path, char* buf, size_t size) { size_t bos = __bos(buf); #if !defined(__clang__) if (__builtin_constant_p(size) && (size > SSIZE_MAX)) { __readlinkat_size_toobig_error(); } if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { return __readlinkat_real(dirfd, path, buf, size); } if (__builtin_constant_p(size) && (size > bos)) { __readlinkat_dest_size_error(); } if (__builtin_constant_p(size) && (size <= bos)) { return __readlinkat_real(dirfd, path, buf, size); } #endif return __readlinkat_chk(dirfd, path, buf, size, bos); } #endif /* defined(__BIONIC_FORTIFY) */ __END_DECLS #endif /* _UNISTD_H_ */