toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr/include/unistd.h - toolchain/prebuilts/ndk-darwin/r21 - Git at Google

 /*
  * 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.
  */

 #pragma once

 #include <stddef.h>
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <sys/select.h>

 #include <bits/fcntl.h>
 #include <bits/getopt.h>
 #include <bits/ioctl.h>
 #include <bits/lockf.h>
 #include <bits/posix_limits.h>
 #include <bits/seek_constants.h>
 #include <bits/sysconf.h>

 __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 _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;

 __noreturn void _exit(int __status);

 pid_t  fork(void);
 pid_t  vfork(void) __returns_twice;
 pid_t  getpid(void);
 pid_t  gettid(void) __attribute_const__;
 pid_t  getpgid(pid_t __pid);
 int    setpgid(pid_t __pid, pid_t __pgid);
 pid_t  getppid(void);
 pid_t  getpgrp(void);
 int    setpgrp(void);

 #if __ANDROID_API__ >= 17
 pid_t  getsid(pid_t __pid) __INTRODUCED_IN(17);
 #endif /* __ANDROID_API__ >= 17 */

 pid_t  setsid(void);

 int execv(const char* __path, char* const* __argv);
 int execvp(const char* __file, char* const* __argv);

 #if __ANDROID_API__ >= 21
 int execvpe(const char* __file, char* const* __argv, char* const* __envp) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 int execve(const char* __file, char* const* __argv, char* const* __envp);
 int execl(const char* __path, const char* __arg0, ...) __attribute__((__sentinel__));
 int execlp(const char* __file, const char* __arg0, ...) __attribute__((__sentinel__));
 int execle(const char* __path, const char* __arg0, ... /*,  char* const* __envp */)
     __attribute__((__sentinel__(1)));

 #if __ANDROID_API__ >= 28
 int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN(28);
 #endif /* __ANDROID_API__ >= 28 */


 int nice(int __incr);

 /**
  * [setegid(2)](http://man7.org/linux/man-pages/man2/setegid.2.html) sets
  * the effective group ID.
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setegid(gid_t __gid);

 /**
  * [seteuid(2)](http://man7.org/linux/man-pages/man2/seteuid.2.html) sets
  * the effective user ID.
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int seteuid(uid_t __uid);

 /**
  * [setgid(2)](http://man7.org/linux/man-pages/man2/setgid.2.html) sets
  * the group ID.
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setgid(gid_t __gid);

 /**
  * [setregid(2)](http://man7.org/linux/man-pages/man2/setregid.2.html) sets
  * the real and effective group IDs (use -1 to leave an ID unchanged).
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setregid(gid_t __rgid, gid_t __egid);

 /**
  * [setresgid(2)](http://man7.org/linux/man-pages/man2/setresgid.2.html) sets
  * the real, effective, and saved group IDs (use -1 to leave an ID unchanged).
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid);

 /**
  * [setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html) sets
  * the real, effective, and saved user IDs (use -1 to leave an ID unchanged).
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid);

 /**
  * [setreuid(2)](http://man7.org/linux/man-pages/man2/setreuid.2.html) sets
  * the real and effective group IDs (use -1 to leave an ID unchanged).
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setreuid(uid_t __ruid, uid_t __euid);

 /**
  * [setuid(2)](http://man7.org/linux/man-pages/man2/setuid.2.html) sets
  * the user ID.
  *
  * On Android, this function only affects the calling thread, not all threads
  * in the process.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int setuid(uid_t __uid);

 uid_t getuid(void);
 uid_t geteuid(void);
 gid_t getgid(void);
 gid_t getegid(void);
 int getgroups(int __size, gid_t* __list);
 int setgroups(size_t __size, const gid_t* __list);
 int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid);
 int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid);
 char* getlogin(void);

 #if __ANDROID_API__ >= 28
 int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
 #endif /* __ANDROID_API__ >= 28 */


 long fpathconf(int __fd, int __name);
 long pathconf(const char* __path, int __name);

 int access(const char* __path, int __mode);
 int faccessat(int __dirfd, const char* __path, int __mode, int __flags);
 int link(const char* __old_path, const char* __new_path);

 #if __ANDROID_API__ >= 21
 int linkat(int __old_dir_fd, const char* __old_path, int __new_dir_fd, const char* __new_path, int __flags) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 int unlink(const char* __path);
 int unlinkat(int __dirfd, const char* __path, int __flags);
 int chdir(const char* __path);
 int fchdir(int __fd);
 int rmdir(const char* __path);
 int pipe(int __fds[2]);
 #if defined(__USE_GNU)
 int pipe2(int __fds[2], int __flags);
 #endif
 int chroot(const char* __path);
 int symlink(const char* __old_path, const char* __new_path);

 #if __ANDROID_API__ >= 21
 int symlinkat(const char* __old_path, int __new_dir_fd, const char* __new_path) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 ssize_t readlink(const char* __path, char* __buf, size_t __buf_size);

 #if __ANDROID_API__ >= 21
 ssize_t readlinkat(int __dir_fd, const char* __path, char* __buf, size_t __buf_size)
     __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 int chown(const char* __path, uid_t __owner, gid_t __group);
 int fchown(int __fd, uid_t __owner, gid_t __group);
 int fchownat(int __dir_fd, const char* __path, uid_t __owner, gid_t __group, int __flags);
 int lchown(const char* __path, uid_t __owner, gid_t __group);
 char* getcwd(char* __buf, size_t __size);

 void sync(void);
 #if defined(__USE_GNU)

 #if __ANDROID_API__ >= 28
 int syncfs(int __fd) __INTRODUCED_IN(28);
 #endif /* __ANDROID_API__ >= 28 */

 #endif

 int close(int __fd);

 ssize_t read(int __fd, void* __buf, size_t __count);
 ssize_t write(int __fd, const void* __buf, size_t __count);

 int dup(int __old_fd);
 int dup2(int __old_fd, int __new_fd);

 #if __ANDROID_API__ >= 21
 int dup3(int __old_fd, int __new_fd, int __flags) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 int fsync(int __fd);
 int fdatasync(int __fd);

 /* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
 #if defined(__USE_FILE_OFFSET64)

 #if __ANDROID_API__ >= 21
 int truncate(const char* __path, off_t __length) __RENAME(truncate64) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64);
 ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset) __RENAME(pread64);
 ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset) __RENAME(pwrite64);
 int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64);
 #else
 int truncate(const char* __path, off_t __length);
 off_t lseek(int __fd, off_t __offset, int __whence);
 ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset);
 ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset);
 int ftruncate(int __fd, off_t __length);
 #endif


 #if __ANDROID_API__ >= 21
 int truncate64(const char* __path, off64_t __length) __INTRODUCED_IN(21);
 #endif /* __ANDROID_API__ >= 21 */

 off64_t lseek64(int __fd, off64_t __offset, int __whence);
 ssize_t pread64(int __fd, void* __buf, size_t __count, off64_t __offset);
 ssize_t pwrite64(int __fd, const void* __buf, size_t __count, off64_t __offset);
 int ftruncate64(int __fd, off64_t __length);

 int pause(void);
 unsigned int alarm(unsigned int __seconds);
 unsigned int sleep(unsigned int __seconds);
 int usleep(useconds_t __microseconds);

 int gethostname(char* __buf, size_t __buf_size);

 #if __ANDROID_API__ >= 23
 int sethostname(const char* __name, size_t __n) __INTRODUCED_IN(23);
 #endif /* __ANDROID_API__ >= 23 */


 int brk(void* __addr);
 void* sbrk(ptrdiff_t __increment);

 int isatty(int __fd);
 char* ttyname(int __fd);
 int ttyname_r(int __fd, char* __buf, size_t __buf_size);

 int acct(const char* __path);

 #if __ANDROID_API__ >= __ANDROID_API_L__
 int getpagesize(void) __INTRODUCED_IN(21);
 #else
 static __inline__ int getpagesize(void) {
   return sysconf(_SC_PAGESIZE);
 }
 #endif

 long syscall(long __number, ...);

 int daemon(int __no_chdir, int __no_close);

 #if defined(__arm__) || (defined(__mips__) && !defined(__LP64__))
 int cacheflush(long __addr, long __nbytes, long __cache);
     /* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
 #endif

 pid_t tcgetpgrp(int __fd);
 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; })


 #if __ANDROID_API__ >= 26
 int getdomainname(char* __buf, size_t __buf_size) __INTRODUCED_IN(26);
 int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
 #endif /* __ANDROID_API__ >= 26 */


 #if __ANDROID_API__ >= 28
 void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN(28);
 #endif /* __ANDROID_API__ >= 28 */


 #if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
 #define _UNISTD_H_
 #include <bits/fortify/unistd.h>
 #undef _UNISTD_H_
 #endif

 __END_DECLS
	/*
	* 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.
	*/

	#pragma once

	#include <stddef.h>
	#include <sys/cdefs.h>
	#include <sys/types.h>
	#include <sys/select.h>

	#include <bits/fcntl.h>
	#include <bits/getopt.h>
	#include <bits/ioctl.h>
	#include <bits/lockf.h>
	#include <bits/posix_limits.h>
	#include <bits/seek_constants.h>
	#include <bits/sysconf.h>

	__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 _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;

	__noreturn void _exit(int __status);

	pid_t fork(void);
	pid_t vfork(void) __returns_twice;
	pid_t getpid(void);
	pid_t gettid(void) __attribute_const__;
	pid_t getpgid(pid_t __pid);
	int setpgid(pid_t __pid, pid_t __pgid);
	pid_t getppid(void);
	pid_t getpgrp(void);
	int setpgrp(void);

	#if __ANDROID_API__ >= 17
	pid_t getsid(pid_t __pid) __INTRODUCED_IN(17);
	#endif /* __ANDROID_API__ >= 17 */

	pid_t setsid(void);

	int execv(const char* __path, char* const* __argv);
	int execvp(const char* __file, char* const* __argv);

	#if __ANDROID_API__ >= 21
	int execvpe(const char* __file, char* const* __argv, char* const* __envp) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	int execve(const char* __file, char* const* __argv, char* const* __envp);
	int execl(const char* __path, const char* __arg0, ...) __attribute__((__sentinel__));
	int execlp(const char* __file, const char* __arg0, ...) __attribute__((__sentinel__));
	int execle(const char* __path, const char* __arg0, ... /, char const* __envp */)
	__attribute__((__sentinel__(1)));

	#if __ANDROID_API__ >= 28
	int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN(28);
	#endif /* __ANDROID_API__ >= 28 */


	int nice(int __incr);

	/**
	* [setegid(2)](http://man7.org/linux/man-pages/man2/setegid.2.html) sets
	* the effective group ID.
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setegid(gid_t __gid);

	/**
	* [seteuid(2)](http://man7.org/linux/man-pages/man2/seteuid.2.html) sets
	* the effective user ID.
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int seteuid(uid_t __uid);

	/**
	* [setgid(2)](http://man7.org/linux/man-pages/man2/setgid.2.html) sets
	* the group ID.
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setgid(gid_t __gid);

	/**
	* [setregid(2)](http://man7.org/linux/man-pages/man2/setregid.2.html) sets
	* the real and effective group IDs (use -1 to leave an ID unchanged).
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setregid(gid_t __rgid, gid_t __egid);

	/**
	* [setresgid(2)](http://man7.org/linux/man-pages/man2/setresgid.2.html) sets
	* the real, effective, and saved group IDs (use -1 to leave an ID unchanged).
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid);

	/**
	* [setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html) sets
	* the real, effective, and saved user IDs (use -1 to leave an ID unchanged).
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid);

	/**
	* [setreuid(2)](http://man7.org/linux/man-pages/man2/setreuid.2.html) sets
	* the real and effective group IDs (use -1 to leave an ID unchanged).
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setreuid(uid_t __ruid, uid_t __euid);

	/**
	* [setuid(2)](http://man7.org/linux/man-pages/man2/setuid.2.html) sets
	* the user ID.
	*
	* On Android, this function only affects the calling thread, not all threads
	* in the process.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int setuid(uid_t __uid);

	uid_t getuid(void);
	uid_t geteuid(void);
	gid_t getgid(void);
	gid_t getegid(void);
	int getgroups(int __size, gid_t* __list);
	int setgroups(size_t __size, const gid_t* __list);
	int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid);
	int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid);
	char* getlogin(void);

	#if __ANDROID_API__ >= 28
	int getlogin_r(char* __buffer, size_t __buffer_size) __INTRODUCED_IN(28);
	#endif /* __ANDROID_API__ >= 28 */


	long fpathconf(int __fd, int __name);
	long pathconf(const char* __path, int __name);

	int access(const char* __path, int __mode);
	int faccessat(int __dirfd, const char* __path, int __mode, int __flags);
	int link(const char* __old_path, const char* __new_path);

	#if __ANDROID_API__ >= 21
	int linkat(int __old_dir_fd, const char* __old_path, int __new_dir_fd, const char* __new_path, int __flags) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	int unlink(const char* __path);
	int unlinkat(int __dirfd, const char* __path, int __flags);
	int chdir(const char* __path);
	int fchdir(int __fd);
	int rmdir(const char* __path);
	int pipe(int __fds[2]);
	#if defined(__USE_GNU)
	int pipe2(int __fds[2], int __flags);
	#endif
	int chroot(const char* __path);
	int symlink(const char* __old_path, const char* __new_path);

	#if __ANDROID_API__ >= 21
	int symlinkat(const char* __old_path, int __new_dir_fd, const char* __new_path) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	ssize_t readlink(const char* __path, char* __buf, size_t __buf_size);

	#if __ANDROID_API__ >= 21
	ssize_t readlinkat(int __dir_fd, const char* __path, char* __buf, size_t __buf_size)
	__INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	int chown(const char* __path, uid_t __owner, gid_t __group);
	int fchown(int __fd, uid_t __owner, gid_t __group);
	int fchownat(int __dir_fd, const char* __path, uid_t __owner, gid_t __group, int __flags);
	int lchown(const char* __path, uid_t __owner, gid_t __group);
	char* getcwd(char* __buf, size_t __size);

	void sync(void);
	#if defined(__USE_GNU)

	#if __ANDROID_API__ >= 28
	int syncfs(int __fd) __INTRODUCED_IN(28);
	#endif /* __ANDROID_API__ >= 28 */

	#endif

	int close(int __fd);

	ssize_t read(int __fd, void* __buf, size_t __count);
	ssize_t write(int __fd, const void* __buf, size_t __count);

	int dup(int __old_fd);
	int dup2(int __old_fd, int __new_fd);

	#if __ANDROID_API__ >= 21
	int dup3(int __old_fd, int __new_fd, int __flags) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	int fsync(int __fd);
	int fdatasync(int __fd);

	/* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
	#if defined(__USE_FILE_OFFSET64)

	#if __ANDROID_API__ >= 21
	int truncate(const char* __path, off_t __length) __RENAME(truncate64) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64);
	ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset) __RENAME(pread64);
	ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset) __RENAME(pwrite64);
	int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64);
	#else
	int truncate(const char* __path, off_t __length);
	off_t lseek(int __fd, off_t __offset, int __whence);
	ssize_t pread(int __fd, void* __buf, size_t __count, off_t __offset);
	ssize_t pwrite(int __fd, const void* __buf, size_t __count, off_t __offset);
	int ftruncate(int __fd, off_t __length);
	#endif


	#if __ANDROID_API__ >= 21
	int truncate64(const char* __path, off64_t __length) __INTRODUCED_IN(21);
	#endif /* __ANDROID_API__ >= 21 */

	off64_t lseek64(int __fd, off64_t __offset, int __whence);
	ssize_t pread64(int __fd, void* __buf, size_t __count, off64_t __offset);
	ssize_t pwrite64(int __fd, const void* __buf, size_t __count, off64_t __offset);
	int ftruncate64(int __fd, off64_t __length);

	int pause(void);
	unsigned int alarm(unsigned int __seconds);
	unsigned int sleep(unsigned int __seconds);
	int usleep(useconds_t __microseconds);

	int gethostname(char* __buf, size_t __buf_size);

	#if __ANDROID_API__ >= 23
	int sethostname(const char* __name, size_t __n) __INTRODUCED_IN(23);
	#endif /* __ANDROID_API__ >= 23 */


	int brk(void* __addr);
	void* sbrk(ptrdiff_t __increment);

	int isatty(int __fd);
	char* ttyname(int __fd);
	int ttyname_r(int __fd, char* __buf, size_t __buf_size);

	int acct(const char* __path);

	#if __ANDROID_API__ >= __ANDROID_API_L__
	int getpagesize(void) __INTRODUCED_IN(21);
	#else
	static __inline__ int getpagesize(void) {
	return sysconf(_SC_PAGESIZE);
	}
	#endif

	long syscall(long __number, ...);

	int daemon(int __no_chdir, int __no_close);

	#if defined(__arm__) \|\| (defined(__mips__) && !defined(__LP64__))
	int cacheflush(long __addr, long __nbytes, long __cache);
	/* __attribute__((deprecated("use __builtin___clear_cache instead"))); */
	#endif

	pid_t tcgetpgrp(int __fd);
	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; })


	#if __ANDROID_API__ >= 26
	int getdomainname(char* __buf, size_t __buf_size) __INTRODUCED_IN(26);
	int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
	#endif /* __ANDROID_API__ >= 26 */



	#if __ANDROID_API__ >= 28
	void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN(28);
	#endif /* __ANDROID_API__ >= 28 */


	#if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
	#define _UNISTD_H_
	#include <bits/fortify/unistd.h>
	#undef _UNISTD_H_
	#endif

	__END_DECLS