libc/include/unistd.h - platform/bionic - 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/getentropy.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* _Nullable * _Nullable environ;

 __noreturn void _exit(int __status);

 /**
  * [fork(2)](http://man7.org/linux/man-pages/man2/fork.2.html) creates a new
  * process. fork() runs any handlers set by pthread_atfork().
  *
  * Returns 0 in the child, the pid of the child in the parent,
  * and returns -1 and sets `errno` on failure.
  */
 pid_t fork(void);

 /**
  * _Fork() creates a new process. _Fork() differs from fork() in that it does
  * not run any handlers set by pthread_atfork(). In addition to any user-defined
  * ones, bionic uses pthread_atfork() handlers to ensure consistency of its own
  * state, so the child should only call
  * [POSIX async-safe](https://man7.org/linux/man-pages/man7/signal-safety.7.html)
  * functions.
  *
  * Returns 0 in the child, the pid of the child in the parent,
  * and returns -1 and sets `errno` on failure.
  *
  * Available since API level 35.
  */
 pid_t _Fork(void) __INTRODUCED_IN(35);

 /**
  * [vfork(2)](http://man7.org/linux/man-pages/man2/vfork.2.html) creates a new
  * process. vfork() differs from fork() in that it does not run any handlers
  * set by pthread_atfork(), and the parent is suspended until the child calls
  * exec() or exits.
  *
  * Returns 0 in the child, the pid of the child in the parent,
  * and returns -1 and sets `errno` on failure.
  */
 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);
 pid_t  getsid(pid_t __pid);
 pid_t  setsid(void);

 int execv(const char* _Nonnull __path, char* _Nullable const* _Nullable __argv);
 int execvp(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv);
 int execvpe(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp);
 int execve(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp);
 int execl(const char* _Nonnull __path, const char* _Nullable __arg0, ...) __attribute__((__sentinel__));
 int execlp(const char* _Nonnull __file, const char* _Nullable __arg0, ...) __attribute__((__sentinel__));
 int execle(const char* _Nonnull __path, const char* _Nullable __arg0, ... /*,  char* const* __envp */)
     __attribute__((__sentinel__(1)));
 int fexecve(int __fd, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp) __INTRODUCED_IN(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* _Nullable __list);
 int setgroups(size_t __size, const gid_t* _Nullable __list);
 int getresuid(uid_t* _Nonnull __ruid, uid_t* _Nonnull __euid, uid_t* _Nonnull __suid);
 int getresgid(gid_t* _Nonnull __rgid, gid_t* _Nonnull __egid, gid_t* _Nonnull __sgid);
 char* _Nullable getlogin(void);
 int getlogin_r(char* _Nonnull __buffer, size_t __buffer_size) __INTRODUCED_IN(28);

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

 int access(const char* _Nonnull __path, int __mode);
 int faccessat(int __dirfd, const char* _Nonnull __path, int __mode, int __flags);
 int link(const char* _Nonnull __old_path, const char* _Nonnull __new_path);
 int linkat(int __old_dir_fd, const char* _Nonnull __old_path, int __new_dir_fd, const char* _Nonnull __new_path, int __flags);
 int unlink(const char* _Nonnull __path);
 int unlinkat(int __dirfd, const char* _Nonnull __path, int __flags);
 int chdir(const char* _Nonnull __path);
 int fchdir(int __fd);
 int rmdir(const char* _Nonnull __path);
 int pipe(int __fds[_Nonnull 2]);
 #if defined(__USE_GNU)
 int pipe2(int __fds[_Nonnull 2], int __flags);
 #endif
 int chroot(const char* _Nonnull __path);
 int symlink(const char* _Nonnull __old_path, const char* _Nonnull __new_path);
 int symlinkat(const char* _Nonnull __old_path, int __new_dir_fd, const char* _Nonnull __new_path);
 ssize_t readlink(const char* _Nonnull __path, char* _Nonnull __buf, size_t __buf_size);
 ssize_t readlinkat(int __dir_fd, const char* _Nonnull __path, char* _Nonnull __buf, size_t __buf_size);
 int chown(const char* _Nonnull __path, uid_t __owner, gid_t __group);
 int fchown(int __fd, uid_t __owner, gid_t __group);
 int fchownat(int __dir_fd, const char* _Nonnull __path, uid_t __owner, gid_t __group, int __flags);
 int lchown(const char* _Nonnull __path, uid_t __owner, gid_t __group);
 char* _Nullable getcwd(char* _Nullable __buf, size_t __size);

 void sync(void);
 #if defined(__USE_GNU)
 int syncfs(int __fd) __INTRODUCED_IN(28);
 #endif

 int close(int __fd);

 /**
  * [read(2)](https://man7.org/linux/man-pages/man2/read.2.html) reads
  * up to `__count` bytes from file descriptor `__fd` into `__buf`.
  *
  * Note: `__buf` is not normally nullable, but may be null in the
  * special case of a zero-length read(), which while not generally
  * useful may be meaningful to some device drivers.
  *
  * Returns the number of bytes read on success, and returns -1 and sets `errno` on failure.
  */
 ssize_t read(int __fd, void* __BIONIC_COMPLICATED_NULLNESS __buf, size_t __count);

 /**
  * [write(2)](https://man7.org/linux/man-pages/man2/write.2.html) writes
  * up to `__count` bytes to file descriptor `__fd` from `__buf`.
  *
  * Note: `__buf` is not normally nullable, but may be null in the
  * special case of a zero-length write(), which while not generally
  * useful may be meaningful to some device drivers.
  *
  * Returns the number of bytes written on success, and returns -1 and sets `errno` on failure.
  */
 ssize_t write(int __fd, const void* __BIONIC_COMPLICATED_NULLNESS __buf, size_t __count);

 int dup(int __old_fd);
 int dup2(int __old_fd, int __new_fd);
 int dup3(int __old_fd, int __new_fd, int __flags);
 int fsync(int __fd);
 int fdatasync(int __fd);

 /* See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md */
 #if defined(__USE_FILE_OFFSET64)
 int truncate(const char* _Nonnull __path, off_t __length) __RENAME(truncate64);
 off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64);
 ssize_t pread(int __fd, void* _Nonnull __buf, size_t __count, off_t __offset) __RENAME(pread64);
 ssize_t pwrite(int __fd, const void* _Nonnull __buf, size_t __count, off_t __offset) __RENAME(pwrite64);
 int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64);
 #else
 int truncate(const char* _Nonnull __path, off_t __length);
 off_t lseek(int __fd, off_t __offset, int __whence);
 ssize_t pread(int __fd, void* _Nonnull __buf, size_t __count, off_t __offset);
 ssize_t pwrite(int __fd, const void* _Nonnull __buf, size_t __count, off_t __offset);
 int ftruncate(int __fd, off_t __length);
 #endif

 int truncate64(const char* _Nonnull __path, off64_t __length);
 off64_t lseek64(int __fd, off64_t __offset, int __whence);
 ssize_t pread64(int __fd, void* _Nonnull __buf, size_t __count, off64_t __offset);
 ssize_t pwrite64(int __fd, const void* _Nonnull __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* _Nonnull _buf, size_t __buf_size);
 int sethostname(const char* _Nonnull __name, size_t __n) __INTRODUCED_IN(23);

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

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

 int acct(const char* _Nullable __path);

 /**
  * [getpagesize(2)](https://man7.org/linux/man-pages/man2/getpagesize.2.html)
  * returns the system's page size. This is slightly faster than going via
  * sysconf().
  *
  * Returns the system's page size in bytes.
  */
 int getpagesize(void) __attribute_const__;

 long syscall(long __number, ...);

 int daemon(int __no_chdir, int __no_close);

 #if defined(__arm__)
 /**
  * New code should use __builtin___clear_cache() instead, which works on
  * all architectures.
  */
 int cacheflush(long __addr, long __nbytes, long __cache);
 #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; })

 int getdomainname(char* _Nonnull __buf, size_t __buf_size) __INTRODUCED_IN(26);
 int setdomainname(const char* _Nonnull __name, size_t __n) __INTRODUCED_IN(26);

 /**
  * [copy_file_range(2)](https://man7.org/linux/man-pages/man2/copy_file_range.2.html) copies
  * a range of data from one file descriptor to another.
  *
  * Available since API level 34.
  *
  * Returns the number of bytes copied on success, and returns -1 and sets
  * `errno` on failure.
  */
 ssize_t copy_file_range(int __fd_in, off64_t* _Nullable __off_in, int __fd_out, off64_t* _Nullable __off_out, size_t __length, unsigned int __flags) __INTRODUCED_IN(34);

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

 /**
  * [close_range(2)](https://man7.org/linux/man-pages/man2/close_range.2.html)
  * performs an action (which depends on value of flags) on an inclusive range
  * of file descriptors.
  *
  * Available since API level 34.
  *
  * Note: there is no emulation on too old kernels, hence this will fail with
  * -1/ENOSYS on pre-5.9 kernels, -1/EINVAL for unsupported flags.  In particular
  * CLOSE_RANGE_CLOEXEC requires 5.11, though support was backported to Android
  * Common Kernel 5.10-T.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
  */
 int close_range(unsigned int __min_fd, unsigned int __max_fd, int __flags) __INTRODUCED_IN(34);

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

 __END_DECLS

 #include <android/legacy_unistd_inlines.h>
	/*
	* 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/getentropy.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* _Nullable * _Nullable environ;

	__noreturn void _exit(int __status);

	/**
	* [fork(2)](http://man7.org/linux/man-pages/man2/fork.2.html) creates a new
	* process. fork() runs any handlers set by pthread_atfork().
	*
	* Returns 0 in the child, the pid of the child in the parent,
	* and returns -1 and sets `errno` on failure.
	*/
	pid_t fork(void);

	/**
	* _Fork() creates a new process. _Fork() differs from fork() in that it does
	* not run any handlers set by pthread_atfork(). In addition to any user-defined
	* ones, bionic uses pthread_atfork() handlers to ensure consistency of its own
	* state, so the child should only call
	* [POSIX async-safe](https://man7.org/linux/man-pages/man7/signal-safety.7.html)
	* functions.
	*
	* Returns 0 in the child, the pid of the child in the parent,
	* and returns -1 and sets `errno` on failure.
	*
	* Available since API level 35.
	*/
	pid_t _Fork(void) __INTRODUCED_IN(35);

	/**
	* [vfork(2)](http://man7.org/linux/man-pages/man2/vfork.2.html) creates a new
	* process. vfork() differs from fork() in that it does not run any handlers
	* set by pthread_atfork(), and the parent is suspended until the child calls
	* exec() or exits.
	*
	* Returns 0 in the child, the pid of the child in the parent,
	* and returns -1 and sets `errno` on failure.
	*/
	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);
	pid_t getsid(pid_t __pid);
	pid_t setsid(void);

	int execv(const char* _Nonnull __path, char* _Nullable const* _Nullable __argv);
	int execvp(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv);
	int execvpe(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp);
	int execve(const char* _Nonnull __file, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp);
	int execl(const char* _Nonnull __path, const char* _Nullable __arg0, ...) __attribute__((__sentinel__));
	int execlp(const char* _Nonnull __file, const char* _Nullable __arg0, ...) __attribute__((__sentinel__));
	int execle(const char* _Nonnull __path, const char* _Nullable __arg0, ... /, char const* __envp */)
	__attribute__((__sentinel__(1)));
	int fexecve(int __fd, char* _Nullable const* _Nullable __argv, char* _Nullable const* _Nullable __envp) __INTRODUCED_IN(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* _Nullable __list);
	int setgroups(size_t __size, const gid_t* _Nullable __list);
	int getresuid(uid_t* _Nonnull __ruid, uid_t* _Nonnull __euid, uid_t* _Nonnull __suid);
	int getresgid(gid_t* _Nonnull __rgid, gid_t* _Nonnull __egid, gid_t* _Nonnull __sgid);
	char* _Nullable getlogin(void);
	int getlogin_r(char* _Nonnull __buffer, size_t __buffer_size) __INTRODUCED_IN(28);

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

	int access(const char* _Nonnull __path, int __mode);
	int faccessat(int __dirfd, const char* _Nonnull __path, int __mode, int __flags);
	int link(const char* _Nonnull __old_path, const char* _Nonnull __new_path);
	int linkat(int __old_dir_fd, const char* _Nonnull __old_path, int __new_dir_fd, const char* _Nonnull __new_path, int __flags);
	int unlink(const char* _Nonnull __path);
	int unlinkat(int __dirfd, const char* _Nonnull __path, int __flags);
	int chdir(const char* _Nonnull __path);
	int fchdir(int __fd);
	int rmdir(const char* _Nonnull __path);
	int pipe(int __fds[_Nonnull 2]);
	#if defined(__USE_GNU)
	int pipe2(int __fds[_Nonnull 2], int __flags);
	#endif
	int chroot(const char* _Nonnull __path);
	int symlink(const char* _Nonnull __old_path, const char* _Nonnull __new_path);
	int symlinkat(const char* _Nonnull __old_path, int __new_dir_fd, const char* _Nonnull __new_path);
	ssize_t readlink(const char* _Nonnull __path, char* _Nonnull __buf, size_t __buf_size);
	ssize_t readlinkat(int __dir_fd, const char* _Nonnull __path, char* _Nonnull __buf, size_t __buf_size);
	int chown(const char* _Nonnull __path, uid_t __owner, gid_t __group);
	int fchown(int __fd, uid_t __owner, gid_t __group);
	int fchownat(int __dir_fd, const char* _Nonnull __path, uid_t __owner, gid_t __group, int __flags);
	int lchown(const char* _Nonnull __path, uid_t __owner, gid_t __group);
	char* _Nullable getcwd(char* _Nullable __buf, size_t __size);

	void sync(void);
	#if defined(__USE_GNU)
	int syncfs(int __fd) __INTRODUCED_IN(28);
	#endif

	int close(int __fd);

	/**
	* [read(2)](https://man7.org/linux/man-pages/man2/read.2.html) reads
	* up to `__count` bytes from file descriptor `__fd` into `__buf`.
	*
	* Note: `__buf` is not normally nullable, but may be null in the
	* special case of a zero-length read(), which while not generally
	* useful may be meaningful to some device drivers.
	*
	* Returns the number of bytes read on success, and returns -1 and sets `errno` on failure.
	*/
	ssize_t read(int __fd, void* __BIONIC_COMPLICATED_NULLNESS __buf, size_t __count);

	/**
	* [write(2)](https://man7.org/linux/man-pages/man2/write.2.html) writes
	* up to `__count` bytes to file descriptor `__fd` from `__buf`.
	*
	* Note: `__buf` is not normally nullable, but may be null in the
	* special case of a zero-length write(), which while not generally
	* useful may be meaningful to some device drivers.
	*
	* Returns the number of bytes written on success, and returns -1 and sets `errno` on failure.
	*/
	ssize_t write(int __fd, const void* __BIONIC_COMPLICATED_NULLNESS __buf, size_t __count);

	int dup(int __old_fd);
	int dup2(int __old_fd, int __new_fd);
	int dup3(int __old_fd, int __new_fd, int __flags);
	int fsync(int __fd);
	int fdatasync(int __fd);

	/* See https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md */
	#if defined(__USE_FILE_OFFSET64)
	int truncate(const char* _Nonnull __path, off_t __length) __RENAME(truncate64);
	off_t lseek(int __fd, off_t __offset, int __whence) __RENAME(lseek64);
	ssize_t pread(int __fd, void* _Nonnull __buf, size_t __count, off_t __offset) __RENAME(pread64);
	ssize_t pwrite(int __fd, const void* _Nonnull __buf, size_t __count, off_t __offset) __RENAME(pwrite64);
	int ftruncate(int __fd, off_t __length) __RENAME(ftruncate64);
	#else
	int truncate(const char* _Nonnull __path, off_t __length);
	off_t lseek(int __fd, off_t __offset, int __whence);
	ssize_t pread(int __fd, void* _Nonnull __buf, size_t __count, off_t __offset);
	ssize_t pwrite(int __fd, const void* _Nonnull __buf, size_t __count, off_t __offset);
	int ftruncate(int __fd, off_t __length);
	#endif

	int truncate64(const char* _Nonnull __path, off64_t __length);
	off64_t lseek64(int __fd, off64_t __offset, int __whence);
	ssize_t pread64(int __fd, void* _Nonnull __buf, size_t __count, off64_t __offset);
	ssize_t pwrite64(int __fd, const void* _Nonnull __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* _Nonnull _buf, size_t __buf_size);
	int sethostname(const char* _Nonnull __name, size_t __n) __INTRODUCED_IN(23);

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

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

	int acct(const char* _Nullable __path);

	/**
	* [getpagesize(2)](https://man7.org/linux/man-pages/man2/getpagesize.2.html)
	* returns the system's page size. This is slightly faster than going via
	* sysconf().
	*
	* Returns the system's page size in bytes.
	*/
	int getpagesize(void) __attribute_const__;

	long syscall(long __number, ...);

	int daemon(int __no_chdir, int __no_close);

	#if defined(__arm__)
	/**
	* New code should use __builtin___clear_cache() instead, which works on
	* all architectures.
	*/
	int cacheflush(long __addr, long __nbytes, long __cache);
	#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; })

	int getdomainname(char* _Nonnull __buf, size_t __buf_size) __INTRODUCED_IN(26);
	int setdomainname(const char* _Nonnull __name, size_t __n) __INTRODUCED_IN(26);

	/**
	* [copy_file_range(2)](https://man7.org/linux/man-pages/man2/copy_file_range.2.html) copies
	* a range of data from one file descriptor to another.
	*
	* Available since API level 34.
	*
	* Returns the number of bytes copied on success, and returns -1 and sets
	* `errno` on failure.
	*/
	ssize_t copy_file_range(int __fd_in, off64_t* _Nullable __off_in, int __fd_out, off64_t* _Nullable __off_out, size_t __length, unsigned int __flags) __INTRODUCED_IN(34);

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

	/**
	* [close_range(2)](https://man7.org/linux/man-pages/man2/close_range.2.html)
	* performs an action (which depends on value of flags) on an inclusive range
	* of file descriptors.
	*
	* Available since API level 34.
	*
	* Note: there is no emulation on too old kernels, hence this will fail with
	* -1/ENOSYS on pre-5.9 kernels, -1/EINVAL for unsupported flags. In particular
	* CLOSE_RANGE_CLOEXEC requires 5.11, though support was backported to Android
	* Common Kernel 5.10-T.
	*
	* Returns 0 on success, and returns -1 and sets `errno` on failure.
	*/
	int close_range(unsigned int __min_fd, unsigned int __max_fd, int __flags) __INTRODUCED_IN(34);

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

	__END_DECLS

	#include <android/legacy_unistd_inlines.h>