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bionic/libc/include/unistd.h
Elliott Hughes f8fcfbc85a Move away from the __ARCH_WANT_SYSCALL_NO_AT system calls. 
Modern architectures only get the *at(2) system calls. For example,
aarch64 doesn't have open(2), and expects userspace to use openat(2)
instead.

Change-Id: I87b4ed79790cb8a80844f5544ac1a13fda26c7b5
2013-10-22 16:31:01 -07:00

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/*
* 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 <stddef.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/sysconf.h>
#include <pathconf.h>
__BEGIN_DECLS
/* Standard file descriptor numbers. */
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
/* Values for whence in fseek and lseek */
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
extern char **environ;
extern __noreturn void _exit(int);
extern pid_t fork(void);
extern pid_t vfork(void);
extern pid_t getpid(void);
extern pid_t gettid(void);
extern pid_t getpgid(pid_t);
extern int setpgid(pid_t, pid_t);
extern pid_t getppid(void);
extern pid_t getpgrp(void);
extern int setpgrp(void);
extern pid_t getsid(pid_t);
extern pid_t setsid(void);
extern int execv(const char *, char * const *);
extern int execvp(const char *, char * const *);
extern int execve(const char *, char * const *, char * const *);
extern int execl(const char *, const char *, ...);
extern int execlp(const char *, const char *, ...);
extern int execle(const char *, const char *, ...);
/* IMPORTANT: See comment under <sys/prctl.h> about this declaration */
extern int prctl(int option, ...);
extern int nice(int);
extern int setuid(uid_t);
extern uid_t getuid(void);
extern int seteuid(uid_t);
extern uid_t geteuid(void);
extern int setgid(gid_t);
extern gid_t getgid(void);
extern int setegid(gid_t);
extern gid_t getegid(void);
extern int getgroups(int, gid_t *);
extern int setgroups(size_t, const gid_t *);
extern int setreuid(uid_t, uid_t);
extern int setregid(gid_t, gid_t);
extern int setresuid(uid_t, uid_t, uid_t);
extern int setresgid(gid_t, gid_t, gid_t);
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 int issetugid(void);
extern char* getlogin(void);
extern char* getusershell(void);
extern void setusershell(void);
extern void endusershell(void);
/* Macros for access() */
#define R_OK 4 /* Read */
#define W_OK 2 /* Write */
#define X_OK 1 /* Execute */
#define F_OK 0 /* Existence */
extern int access(const char*, int);
extern int faccessat(int, const char*, int, int);
extern int link(const char*, const char*);
extern int linkat(int, const char*, int, const char*, int);
extern int unlink(const char*);
extern int unlinkat(int, const char*, int);
extern int chdir(const char *);
extern int fchdir(int);
extern int rmdir(const char *);
extern int pipe(int *);
#ifdef _GNU_SOURCE /* GLibc compatibility */
extern int pipe2(int *, int);
#endif
extern int chroot(const char *);
extern int symlink(const char*, const char*);
extern int symlinkat(const char*, int, const char*);
extern ssize_t readlink(const char*, char*, size_t);
extern ssize_t readlinkat(int, const char*, char*, size_t);
extern int chown(const char *, uid_t, gid_t);
extern int fchown(int, uid_t, gid_t);
extern int fchownat(int, const char*, uid_t, gid_t, int);
extern int lchown(const char *, uid_t, gid_t);
extern int truncate(const char *, off_t);
extern int truncate64(const char *, off64_t);
extern char *getcwd(char *, size_t);
extern int sync(void);
extern int close(int);
extern off_t lseek(int, off_t, int);
extern off64_t lseek64(int, off64_t, int);
extern ssize_t read(int, void *, size_t);
extern ssize_t write(int, const void *, size_t);
extern ssize_t pread(int, void *, size_t, off_t);
extern ssize_t pread64(int, void *, size_t, off64_t);
extern ssize_t pwrite(int, const void *, size_t, off_t);
extern ssize_t pwrite64(int, const void *, size_t, off64_t);
extern int dup(int);
extern int dup2(int, int);
extern int fcntl(int, int, ...);
extern int ioctl(int, int, ...);
extern int flock(int, int);
extern int fsync(int);
extern int fdatasync(int);
extern int ftruncate(int, off_t);
extern int ftruncate64(int, off64_t);
extern int pause(void);
extern unsigned int alarm(unsigned int);
extern unsigned int sleep(unsigned int);
extern int usleep(unsigned long);
extern int gethostname(char *, size_t);
extern int getdtablesize(void);
extern void *__brk(void *);
extern int brk(void *);
extern void *sbrk(ptrdiff_t);
extern int getopt(int, char * const *, const char *);
extern char *optarg;
extern int optind, opterr, optopt;
extern int isatty(int);
extern char* ttyname(int);
extern int ttyname_r(int, char*, size_t);
extern int acct(const char* filepath);
int getpagesize(void);
extern int sysconf(int name);
extern int daemon(int, int);
/* A special syscall that is only available on the ARM, not x86 function. */
extern int cacheflush(long start, long end, long flags);
extern pid_t tcgetpgrp(int fd);
extern int tcsetpgrp(int fd, pid_t _pid);
#if 0 /* MISSING FROM BIONIC */
extern int execvpe(const char *, char * const *, char * const *);
extern int execlpe(const char *, const char *, ...);
extern int getfsuid(uid_t);
extern int setfsuid(uid_t);
extern int getlogin_r(char* name, size_t namesize);
extern int sethostname(const char *, size_t);
extern int getdomainname(char *, size_t);
extern int setdomainname(const char *, size_t);
#endif /* MISSING */
/* 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; })
#if defined(__BIONIC_FORTIFY)
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)
__asm__(__USER_LABEL_PREFIX__ "read");
__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);
}
#endif /* defined(__BIONIC_FORTIFY) */
__END_DECLS
#endif /* _UNISTD_H_ */
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