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 #ifndef _UNISTD_H_ 29 #define _UNISTD_H_ 30 31 #include <stddef.h> 32 #include <sys/cdefs.h> 33 #include <sys/types.h> 34 #include <sys/select.h> 35 #include <sys/sysconf.h> 36 #include <pathconf.h> 37 38 __BEGIN_DECLS 39 40 /* Standard file descriptor numbers. */ 41 #define STDIN_FILENO 0 42 #define STDOUT_FILENO 1 43 #define STDERR_FILENO 2 44 45 /* Values for whence in fseek and lseek */ 46 #define SEEK_SET 0 47 #define SEEK_CUR 1 48 #define SEEK_END 2 49 50 extern char** environ; 51 52 extern __noreturn void _exit(int); 53 54 extern pid_t fork(void); 55 extern pid_t vfork(void); 56 extern pid_t getpid(void); 57 extern pid_t gettid(void) __pure2; 58 extern pid_t getpgid(pid_t); 59 extern int setpgid(pid_t, pid_t); 60 extern pid_t getppid(void); 61 extern pid_t getpgrp(void); 62 extern int setpgrp(void); 63 extern pid_t getsid(pid_t); 64 extern pid_t setsid(void); 65 66 extern int execv(const char *, char * const *); 67 extern int execvp(const char *, char * const *); 68 extern int execvpe(const char *, char * const *, char * const *); 69 extern int execve(const char *, char * const *, char * const *); 70 extern int execl(const char *, const char *, ...); 71 extern int execlp(const char *, const char *, ...); 72 extern int execle(const char *, const char *, ...); 73 74 extern int nice(int); 75 76 extern int setuid(uid_t); 77 extern uid_t getuid(void); 78 extern int seteuid(uid_t); 79 extern uid_t geteuid(void); 80 extern int setgid(gid_t); 81 extern gid_t getgid(void); 82 extern int setegid(gid_t); 83 extern gid_t getegid(void); 84 extern int getgroups(int, gid_t *); 85 extern int setgroups(size_t, const gid_t *); 86 extern int setreuid(uid_t, uid_t); 87 extern int setregid(gid_t, gid_t); 88 extern int setresuid(uid_t, uid_t, uid_t); 89 extern int setresgid(gid_t, gid_t, gid_t); 90 extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid); 91 extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid); 92 extern char* getlogin(void); 93 94 /* Macros for access() */ 95 #define R_OK 4 /* Read */ 96 #define W_OK 2 /* Write */ 97 #define X_OK 1 /* Execute */ 98 #define F_OK 0 /* Existence */ 99 100 extern int access(const char*, int); 101 extern int faccessat(int, const char*, int, int); 102 extern int link(const char*, const char*); 103 extern int linkat(int, const char*, int, const char*, int); 104 extern int unlink(const char*); 105 extern int unlinkat(int, const char*, int); 106 extern int chdir(const char *); 107 extern int fchdir(int); 108 extern int rmdir(const char *); 109 extern int pipe(int *); 110 #ifdef _GNU_SOURCE 111 extern int pipe2(int *, int); 112 #endif 113 extern int chroot(const char *); 114 extern int symlink(const char*, const char*); 115 extern int symlinkat(const char*, int, const char*); 116 extern ssize_t readlink(const char*, char*, size_t); 117 extern ssize_t readlinkat(int, const char*, char*, size_t); 118 extern int chown(const char *, uid_t, gid_t); 119 extern int fchown(int, uid_t, gid_t); 120 extern int fchownat(int, const char*, uid_t, gid_t, int); 121 extern int lchown(const char *, uid_t, gid_t); 122 extern int truncate(const char *, off_t); 123 extern int truncate64(const char *, off64_t); 124 extern char *getcwd(char *, size_t); 125 126 extern int sync(void); 127 128 extern int close(int); 129 extern off_t lseek(int, off_t, int); 130 extern off64_t lseek64(int, off64_t, int); 131 132 extern ssize_t read(int, void *, size_t); 133 extern ssize_t write(int, const void *, size_t); 134 extern ssize_t pread(int, void *, size_t, off_t); 135 extern ssize_t pread64(int, void *, size_t, off64_t); 136 extern ssize_t pwrite(int, const void *, size_t, off_t); 137 extern ssize_t pwrite64(int, const void *, size_t, off64_t); 138 139 extern int dup(int); 140 extern int dup2(int, int); 141 #ifdef _GNU_SOURCE 142 extern int dup3(int, int, int); 143 #endif 144 extern int fcntl(int, int, ...); 145 extern int ioctl(int, int, ...); 146 extern int flock(int, int); 147 extern int fsync(int); 148 extern int fdatasync(int); 149 extern int ftruncate(int, off_t); 150 extern int ftruncate64(int, off64_t); 151 152 extern int pause(void); 153 extern unsigned int alarm(unsigned int); 154 extern unsigned int sleep(unsigned int); 155 extern int usleep(useconds_t); 156 157 extern int gethostname(char *, size_t); 158 159 extern void *__brk(void *); 160 extern int brk(void *); 161 extern void *sbrk(ptrdiff_t); 162 163 extern int getopt(int, char * const *, const char *); 164 extern char *optarg; 165 extern int optind, opterr, optopt; 166 167 extern int isatty(int); 168 extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead"); 169 extern int ttyname_r(int, char*, size_t); 170 171 extern int acct(const char* filepath); 172 173 int getpagesize(void); 174 175 long sysconf(int); 176 177 extern int daemon(int, int); 178 179 #if defined(__arm__) || (defined(__mips__) && !defined(__LP64__)) 180 extern int cacheflush(long, long, long); 181 /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */ 182 #endif 183 184 extern pid_t tcgetpgrp(int fd); 185 extern int tcsetpgrp(int fd, pid_t _pid); 186 187 /* Used to retry syscalls that can return EINTR. */ 188 #define TEMP_FAILURE_RETRY(exp) ({ \ 189 __typeof__(exp) _rc; \ 190 do { \ 191 _rc = (exp); \ 192 } while (_rc == -1 && errno == EINTR); \ 193 _rc; }) 194 195 #if defined(__BIONIC_FORTIFY) 196 extern ssize_t __read_chk(int, void*, size_t, size_t); 197 __errordecl(__read_dest_size_error, "read called with size bigger than destination"); 198 __errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX"); 199 extern ssize_t __read_real(int, void*, size_t) 200 __asm__(__USER_LABEL_PREFIX__ "read"); 201 202 __BIONIC_FORTIFY_INLINE 203 ssize_t read(int fd, void* buf, size_t count) { 204 size_t bos = __bos0(buf); 205 206 #if !defined(__clang__) 207 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 208 __read_count_toobig_error(); 209 } 210 211 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 212 return __read_real(fd, buf, count); 213 } 214 215 if (__builtin_constant_p(count) && (count > bos)) { 216 __read_dest_size_error(); 217 } 218 219 if (__builtin_constant_p(count) && (count <= bos)) { 220 return __read_real(fd, buf, count); 221 } 222 #endif 223 224 return __read_chk(fd, buf, count, bos); 225 } 226 #endif /* defined(__BIONIC_FORTIFY) */ 227 228 __END_DECLS 229 230 #endif /* _UNISTD_H_ */ 231
