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      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 <linux/capability.h>
     37 #include <pathconf.h>
     38 
     39 __BEGIN_DECLS
     40 
     41 /* Standard file descriptor numbers. */
     42 #define STDIN_FILENO	0
     43 #define STDOUT_FILENO	1
     44 #define STDERR_FILENO	2
     45 
     46 /* Values for whence in fseek and lseek */
     47 #define SEEK_SET 0
     48 #define SEEK_CUR 1
     49 #define SEEK_END 2
     50 
     51 extern char **environ;
     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);
     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  setsid(void);
     64 
     65 extern int execv(const char *, char * const *);
     66 extern int execvp(const char *, char * const *);
     67 extern int execve(const char *, char * const *, char * const *);
     68 extern int execl(const char *, const char *, ...);
     69 extern int execlp(const char *, const char *, ...);
     70 extern int execle(const char *, const char *, ...);
     71 extern int capget(cap_user_header_t hdrp, cap_user_data_t datap);
     72 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
     73 
     74 /* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
     75 extern int prctl(int  option, ...);
     76 
     77 extern int nice(int);
     78 
     79 extern int setuid(uid_t);
     80 extern uid_t getuid(void);
     81 extern int seteuid(uid_t);
     82 extern uid_t geteuid(void);
     83 extern int setgid(gid_t);
     84 extern gid_t getgid(void);
     85 extern int setegid(gid_t);
     86 extern gid_t getegid(void);
     87 extern int getgroups(int, gid_t *);
     88 extern int setgroups(size_t, const gid_t *);
     89 extern int setreuid(uid_t, uid_t);
     90 extern int setregid(gid_t, gid_t);
     91 extern int setresuid(uid_t, uid_t, uid_t);
     92 extern int setresgid(gid_t, gid_t, gid_t);
     93 extern int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
     94 extern int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
     95 extern int issetugid(void);
     96 extern char* getlogin(void);
     97 extern char* getusershell(void);
     98 extern void setusershell(void);
     99 extern void endusershell(void);
    100 
    101 
    102 
    103 /* Macros for access() */
    104 #define R_OK  4  /* Read */
    105 #define W_OK  2  /* Write */
    106 #define X_OK  1  /* Execute */
    107 #define F_OK  0  /* Existence */
    108 
    109 extern int access(const char *, int);
    110 extern int link(const char *, const char *);
    111 extern int unlink(const char *);
    112 extern int chdir(const char *);
    113 extern int fchdir(int);
    114 extern int rmdir(const char *);
    115 extern int pipe(int *);
    116 #ifdef _GNU_SOURCE  /* GLibc compatibility */
    117 extern int pipe2(int *, int);
    118 #endif
    119 extern int chroot(const char *);
    120 extern int symlink(const char *, const char *);
    121 extern int readlink(const char *, char *, size_t);
    122 extern int chown(const char *, uid_t, gid_t);
    123 extern int fchown(int, uid_t, gid_t);
    124 extern int lchown(const char *, uid_t, gid_t);
    125 extern int truncate(const char *, off_t);
    126 extern char *getcwd(char *, size_t);
    127 
    128 extern int sync(void);
    129 
    130 extern int close(int);
    131 extern off_t lseek(int, off_t, int);
    132 extern off64_t lseek64(int, off64_t, int);
    133 
    134 extern ssize_t read(int, void *, size_t);
    135 extern ssize_t write(int, const void *, size_t);
    136 extern ssize_t pread(int, void *, size_t, off_t);
    137 extern ssize_t pread64(int, void *, size_t, off64_t);
    138 extern ssize_t pwrite(int, const void *, size_t, off_t);
    139 extern ssize_t pwrite64(int, const void *, size_t, off64_t);
    140 
    141 extern int dup(int);
    142 extern int dup2(int, int);
    143 extern int fcntl(int, int, ...);
    144 extern int ioctl(int, int, ...);
    145 extern int flock(int, int);
    146 extern int fsync(int);
    147 extern int fdatasync(int);
    148 extern int ftruncate(int, off_t);
    149 extern int ftruncate64(int, off64_t);
    150 
    151 extern int pause(void);
    152 extern unsigned int alarm(unsigned int);
    153 extern unsigned int sleep(unsigned int);
    154 extern int usleep(unsigned long);
    155 
    156 extern int gethostname(char *, size_t);
    157 
    158 extern int getdtablesize(void);
    159 
    160 extern void *__brk(void *);
    161 extern int brk(void *);
    162 extern void *sbrk(ptrdiff_t);
    163 
    164 extern int getopt(int, char * const *, const char *);
    165 extern char *optarg;
    166 extern int optind, opterr, optopt;
    167 
    168 extern int isatty(int);
    169 extern char* ttyname(int);
    170 extern int ttyname_r(int, char*, size_t);
    171 
    172 extern int  acct(const char*  filepath);
    173 
    174 static __inline__ int getpagesize(void) {
    175   extern unsigned int __page_size;
    176   return __page_size;
    177 }
    178 static __inline__ int __getpageshift(void) {
    179   extern unsigned int __page_shift;
    180   return __page_shift;
    181 }
    182 
    183 long sysconf(int);
    184 
    185 extern int daemon(int, int);
    186 
    187 /* A special syscall that is only available on the ARM, not x86 function. */
    188 extern int cacheflush(long start, long end, long flags);
    189 
    190 extern pid_t tcgetpgrp(int fd);
    191 extern int   tcsetpgrp(int fd, pid_t _pid);
    192 
    193 #if 0 /* MISSING FROM BIONIC */
    194 extern pid_t  getsid(pid_t);
    195 extern int execvpe(const char *, char * const *, char * const *);
    196 extern int execlpe(const char *, const char *, ...);
    197 extern int getfsuid(uid_t);
    198 extern int setfsuid(uid_t);
    199 extern int getlogin_r(char* name, size_t namesize);
    200 extern int sethostname(const char *, size_t);
    201 extern int getdomainname(char *, size_t);
    202 extern int setdomainname(const char *, size_t);
    203 #endif /* MISSING */
    204 
    205 /* Used to retry syscalls that can return EINTR. */
    206 #define TEMP_FAILURE_RETRY(exp) ({         \
    207     typeof (exp) _rc;                      \
    208     do {                                   \
    209         _rc = (exp);                       \
    210     } while (_rc == -1 && errno == EINTR); \
    211     _rc; })
    212 
    213 __END_DECLS
    214 
    215 #endif /* _UNISTD_H_ */
    216