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 extern char* getusershell(void); 94 extern void setusershell(void); 95 extern void endusershell(void); 96 97 98 99 /* Macros for access() */ 100 #define R_OK 4 /* Read */ 101 #define W_OK 2 /* Write */ 102 #define X_OK 1 /* Execute */ 103 #define F_OK 0 /* Existence */ 104 105 extern int access(const char*, int); 106 extern int faccessat(int, const char*, int, int); 107 extern int link(const char*, const char*); 108 extern int linkat(int, const char*, int, const char*, int); 109 extern int unlink(const char*); 110 extern int unlinkat(int, const char*, int); 111 extern int chdir(const char *); 112 extern int fchdir(int); 113 extern int rmdir(const char *); 114 extern int pipe(int *); 115 #ifdef _GNU_SOURCE 116 extern int pipe2(int *, int); 117 #endif 118 extern int chroot(const char *); 119 extern int symlink(const char*, const char*); 120 extern int symlinkat(const char*, int, const char*); 121 extern ssize_t readlink(const char*, char*, size_t); 122 extern ssize_t readlinkat(int, const char*, char*, size_t); 123 extern int chown(const char *, uid_t, gid_t); 124 extern int fchown(int, uid_t, gid_t); 125 extern int fchownat(int, const char*, uid_t, gid_t, int); 126 extern int lchown(const char *, uid_t, gid_t); 127 extern int truncate(const char *, off_t); 128 extern int truncate64(const char *, off64_t); 129 extern char *getcwd(char *, size_t); 130 131 extern int sync(void); 132 133 extern int close(int); 134 extern off_t lseek(int, off_t, int); 135 extern off64_t lseek64(int, off64_t, int); 136 137 extern ssize_t read(int, void *, size_t); 138 extern ssize_t write(int, const void *, size_t); 139 extern ssize_t pread(int, void *, size_t, off_t); 140 extern ssize_t pread64(int, void *, size_t, off64_t); 141 extern ssize_t pwrite(int, const void *, size_t, off_t); 142 extern ssize_t pwrite64(int, const void *, size_t, off64_t); 143 144 extern int dup(int); 145 extern int dup2(int, int); 146 #ifdef _GNU_SOURCE 147 extern int dup3(int, int, int); 148 #endif 149 extern int fcntl(int, int, ...); 150 extern int ioctl(int, int, ...); 151 extern int flock(int, int); 152 extern int fsync(int); 153 extern int fdatasync(int); 154 extern int ftruncate(int, off_t); 155 extern int ftruncate64(int, off64_t); 156 157 extern int pause(void); 158 extern unsigned int alarm(unsigned int); 159 extern unsigned int sleep(unsigned int); 160 extern int usleep(useconds_t); 161 162 extern int gethostname(char *, size_t); 163 164 extern void *__brk(void *); 165 extern int brk(void *); 166 extern void *sbrk(ptrdiff_t); 167 168 extern int getopt(int, char * const *, const char *); 169 extern char *optarg; 170 extern int optind, opterr, optopt; 171 172 extern int isatty(int); 173 extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead"); 174 extern int ttyname_r(int, char*, size_t); 175 176 extern int acct(const char* filepath); 177 178 int getpagesize(void); 179 180 long sysconf(int); 181 182 extern int daemon(int, int); 183 184 #if defined(__arm__) || (defined(__mips__) && !defined(__LP64__)) 185 extern int cacheflush(long, long, long); 186 /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */ 187 #endif 188 189 extern pid_t tcgetpgrp(int fd); 190 extern int tcsetpgrp(int fd, pid_t _pid); 191 192 /* Used to retry syscalls that can return EINTR. */ 193 #define TEMP_FAILURE_RETRY(exp) ({ \ 194 __typeof__(exp) _rc; \ 195 do { \ 196 _rc = (exp); \ 197 } while (_rc == -1 && errno == EINTR); \ 198 _rc; }) 199 200 #if defined(__BIONIC_FORTIFY) 201 extern ssize_t __read_chk(int, void*, size_t, size_t); 202 __errordecl(__read_dest_size_error, "read called with size bigger than destination"); 203 __errordecl(__read_count_toobig_error, "read called with count > SSIZE_MAX"); 204 extern ssize_t __read_real(int, void*, size_t) 205 __asm__(__USER_LABEL_PREFIX__ "read"); 206 207 __BIONIC_FORTIFY_INLINE 208 ssize_t read(int fd, void* buf, size_t count) { 209 size_t bos = __bos0(buf); 210 211 #if !defined(__clang__) 212 if (__builtin_constant_p(count) && (count > SSIZE_MAX)) { 213 __read_count_toobig_error(); 214 } 215 216 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 217 return __read_real(fd, buf, count); 218 } 219 220 if (__builtin_constant_p(count) && (count > bos)) { 221 __read_dest_size_error(); 222 } 223 224 if (__builtin_constant_p(count) && (count <= bos)) { 225 return __read_real(fd, buf, count); 226 } 227 #endif 228 229 return __read_chk(fd, buf, count, bos); 230 } 231 #endif /* defined(__BIONIC_FORTIFY) */ 232 233 __END_DECLS 234 235 #endif /* _UNISTD_H_ */ 236
