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unistd.h
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/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/*
* POSIX Standard: 2.10 Symbolic Constants <unistd.h>
*/
#ifndef _UNISTD_H
#define _UNISTD_H 1
#include <features.h>
__BEGIN_DECLS
/* These may be used to determine what facilities are present at compile time.
Their values can be obtained at run time from `sysconf'. */
#ifdef __USE_XOPEN2K8
/* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */
# define _POSIX_VERSION 200809L
#elif defined __USE_XOPEN2K
/* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
# define _POSIX_VERSION 200112L
#elif defined __USE_POSIX199506
/* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */
# define _POSIX_VERSION 199506L
#elif defined __USE_POSIX199309
/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */
# define _POSIX_VERSION 199309L
#else
/* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */
# define _POSIX_VERSION 199009L
#endif
/* These are not #ifdef __USE_POSIX2 because they are
in the theoretically application-owned namespace. */
#ifdef __USE_XOPEN2K8
# define __POSIX2_THIS_VERSION 200809L
/* The utilities on GNU systems also correspond to this version. */
#elif defined __USE_XOPEN2K
/* The utilities on GNU systems also correspond to this version. */
# define __POSIX2_THIS_VERSION 200112L
#elif defined __USE_POSIX199506
/* The utilities on GNU systems also correspond to this version. */
# define __POSIX2_THIS_VERSION 199506L
#else
/* The utilities on GNU systems also correspond to this version. */
# define __POSIX2_THIS_VERSION 199209L
#endif
/* The utilities on GNU systems also correspond to this version. */
#define _POSIX2_VERSION __POSIX2_THIS_VERSION
/* This symbol was required until the 2001 edition of POSIX. */
#define _POSIX2_C_VERSION __POSIX2_THIS_VERSION
/* If defined, the implementation supports the
C Language Bindings Option. */
#define _POSIX2_C_BIND __POSIX2_THIS_VERSION
/* If defined, the implementation supports the
C Language Development Utilities Option. */
#define _POSIX2_C_DEV __POSIX2_THIS_VERSION
/* If defined, the implementation supports the
Software Development Utilities Option. */
#define _POSIX2_SW_DEV __POSIX2_THIS_VERSION
/* If defined, the implementation supports the
creation of locales with the localedef utility. */
#define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION
/* X/Open version number to which the library conforms. It is selectable. */
#ifdef __USE_XOPEN2K8
# define _XOPEN_VERSION 700
#elif defined __USE_XOPEN2K
# define _XOPEN_VERSION 600
#elif defined __USE_UNIX98
# define _XOPEN_VERSION 500
#else
# define _XOPEN_VERSION 4
#endif
/* Commands and utilities from XPG4 are available. */
#define _XOPEN_XCU_VERSION 4
/* We are compatible with the old published standards as well. */
#define _XOPEN_XPG2 1
#define _XOPEN_XPG3 1
#define _XOPEN_XPG4 1
/* The X/Open Unix extensions are available. */
#define _XOPEN_UNIX 1
/* The enhanced internationalization capabilities according to XPG4.2
are present. */
#define _XOPEN_ENH_I18N 1
/* The legacy interfaces are also available. */
#define _XOPEN_LEGACY 1
/* Get values of POSIX options:
If these symbols are defined, the corresponding features are
always available. If not, they may be available sometimes.
The current values can be obtained with `sysconf'.
_POSIX_JOB_CONTROL Job control is supported.
_POSIX_SAVED_IDS Processes have a saved set-user-ID
and a saved set-group-ID.
_POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
_POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
_POSIX_TIMERS POSIX.4 clocks and timers are supported.
_POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
_POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
_POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
_POSIX_FSYNC The fsync function is present.
_POSIX_MAPPED_FILES Mapping of files to memory is supported.
_POSIX_MEMLOCK Locking of all memory is supported.
_POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
_POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
_POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
_POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
_POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
_POSIX_THREADS POSIX.1c pthreads are supported.
_POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
_POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
_POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
_POSIX_THREAD_PRIORITY_SCHEDULING
POSIX.1c thread execution scheduling supported.
_POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
_POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
_POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
_POSIX_PII Protocol-independent interfaces are supported.
_POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
_POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
_POSIX_PII_INTERNET Internet family of protocols supported.
_POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
_POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
_POSIX_PII_OSI ISO/OSI family of protocols supported.
_POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
_POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
_POSIX_POLL Implementation supports `poll' function.
_POSIX_SELECT Implementation supports `select' and `pselect'.
_XOPEN_REALTIME X/Open realtime support is available.
_XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
_XOPEN_SHM Shared memory interface according to XPG4.2.
_XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
int, long, pointer, and off_t types.
_XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
int, long, and pointer and off_t with at least
64 bits.
_XBS5_LP64_OFF64 Implementation provides environment with 32-bit
int, and 64-bit long, pointer, and off_t types.
_XBS5_LPBIG_OFFBIG Implementation provides environment with at
least 32 bits int and long, pointer, and off_t
with at least 64 bits.
If any of these symbols is defined as -1, the corresponding option is not
true for any file. If any is defined as other than -1, the corresponding
option is true for all files. If a symbol is not defined at all, the value
for a specific file can be obtained from `pathconf' and `fpathconf'.
_POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
the owner of a file. `chown' can only be used
to change the group ID of a file to a group of
which the calling process is a member.
_POSIX_NO_TRUNC Pathname components longer than
NAME_MAX generate an error.
_POSIX_VDISABLE If defined, if the value of an element of the
`c_cc' member of `struct termios' is
_POSIX_VDISABLE, no character will have the
effect associated with that element.
_POSIX_SYNC_IO Synchronous I/O may be performed.
_POSIX_ASYNC_IO Asynchronous I/O may be performed.
_POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
Support for the Large File Support interface is not generally available.
If it is available the following constants are defined to one.
_LFS64_LARGEFILE Low-level I/O supports large files.
_LFS64_STDIO Standard I/O supports large files.
*/
#include <bits/posix_opt.h>
/* Get the environment definitions from Unix98. */
#if defined __USE_UNIX98 || defined __USE_XOPEN2K
# include <bits/environments.h>
#endif
/* Standard file descriptors. */
#define STDIN_FILENO 0 /* Standard input. */
#define STDOUT_FILENO 1 /* Standard output. */
#define STDERR_FILENO 2 /* Standard error output. */
/* All functions that are not declared anywhere else. */
#include <bits/types.h>
#ifndef __ssize_t_defined
typedef __ssize_t ssize_t;
# define __ssize_t_defined
#endif
#define __need_size_t
#define __need_NULL
#include <stddef.h>
#if defined __USE_XOPEN || defined __USE_XOPEN2K
/* The Single Unix specification says that some more types are
available here. */
# ifndef __gid_t_defined
typedef __gid_t gid_t;
# define __gid_t_defined
# endif
# ifndef __uid_t_defined
typedef __uid_t uid_t;
# define __uid_t_defined
# endif
# ifndef __off_t_defined
# ifndef __USE_FILE_OFFSET64
typedef __off_t off_t;
# else
typedef __off64_t off_t;
# endif
# define __off_t_defined
# endif
# if defined __USE_LARGEFILE64 && !defined __off64_t_defined
typedef __off64_t off64_t;
# define __off64_t_defined
# endif
# ifndef __useconds_t_defined
typedef __useconds_t useconds_t;
# define __useconds_t_defined
# endif
# ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
# endif
#endif /* X/Open */
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
# ifndef __intptr_t_defined
typedef __intptr_t intptr_t;
# define __intptr_t_defined
# endif
#endif
#if defined __USE_MISC || defined __USE_XOPEN
# ifndef __socklen_t_defined
typedef __socklen_t socklen_t;
# define __socklen_t_defined
# endif
#endif
/* Values for the second argument to access.
These may be OR'd together. */
#define R_OK 4 /* Test for read permission. */
#define W_OK 2 /* Test for write permission. */
#define X_OK 1 /* Test for execute permission. */
#define F_OK 0 /* Test for existence. */
/* Test for access to NAME using the real UID and real GID. */
extern int access (const char *__name, int __type) __THROW __nonnull ((1));
#ifdef __USE_GNU
/* Test for access to NAME using the effective UID and GID
(as normal file operations use). */
extern int euidaccess (const char *__name, int __type)
__THROW __nonnull ((1));
/* An alias for `euidaccess', used by some other systems. */
extern int eaccess (const char *__name, int __type)
__THROW __nonnull ((1));
/* Execute program relative to a directory file descriptor. */
extern int execveat (int __fd, const char *__path, char *const __argv[],
char *const __envp[], int __flags)
__THROW __nonnull ((2, 3));
#endif
#ifdef __USE_ATFILE
/* Test for access to FILE relative to the directory FD is open on.
If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
otherwise use real IDs like `access'. */
extern int faccessat (int __fd, const char *__file, int __type, int __flag)
__THROW __nonnull ((2)) __wur;
#endif /* Use GNU. */
/* Values for the WHENCE argument to lseek. */
#ifndef _STDIO_H /* <stdio.h> has the same definitions. */
# define SEEK_SET 0 /* Seek from beginning of file. */
# define SEEK_CUR 1 /* Seek from current position. */
# define SEEK_END 2 /* Seek from end of file. */
# ifdef __USE_GNU
# define SEEK_DATA 3 /* Seek to next data. */
# define SEEK_HOLE 4 /* Seek to next hole. */
# endif
#endif
#if defined __USE_MISC && !defined L_SET
/* Old BSD names for the same constants; just for compatibility. */
# define L_SET SEEK_SET
# define L_INCR SEEK_CUR
# define L_XTND SEEK_END
#endif
/* Move FD's file position to OFFSET bytes from the
beginning of the file (if WHENCE is SEEK_SET),
the current position (if WHENCE is SEEK_CUR),
or the end of the file (if WHENCE is SEEK_END).
Return the new file position. */
#ifndef __USE_FILE_OFFSET64
extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
#else
# ifdef __REDIRECT_NTH
extern __off64_t __REDIRECT_NTH (lseek,
(int __fd, __off64_t __offset, int __whence),
lseek64);
# else
# define lseek lseek64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
__THROW;
#endif
/* Close the file descriptor FD.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int close (int __fd);
#ifdef __USE_MISC
/* Close all open file descriptors greater than or equal to LOWFD.
Negative LOWFD is clamped to 0. */
extern void closefrom (int __lowfd) __THROW;
#endif
/* Read NBYTES into BUF from FD. Return the
number read, -1 for errors or 0 for EOF.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur
__fortified_attr_access (__write_only__, 2, 3);
/* Write N bytes of BUF to FD. Return the number written, or -1.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur
__attr_access ((__read_only__, 2, 3));
#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
# ifndef __USE_FILE_OFFSET64
/* Read NBYTES into BUF from FD at the given position OFFSET without
changing the file pointer. Return the number read, -1 for errors
or 0 for EOF.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
__off_t __offset) __wur
__fortified_attr_access (__write_only__, 2, 3);
/* Write N bytes of BUF to FD at the given position OFFSET without
changing the file pointer. Return the number written, or -1.
This function is a cancellation point and therefore not marked with
__THROW. */
extern ssize_t pwrite (int __fd, const void *__buf, size_t __n,
__off_t __offset) __wur
__attr_access ((__read_only__, 2, 3));
# else
# ifdef __REDIRECT
extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
__off64_t __offset),
pread64) __wur
__fortified_attr_access (__write_only__, 2, 3);
extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf,
size_t __nbytes, __off64_t __offset),
pwrite64) __wur
__attr_access ((__read_only__, 2, 3));
# else
# define pread pread64
# define pwrite pwrite64
# endif
# endif
# ifdef __USE_LARGEFILE64
/* Read NBYTES into BUF from FD at the given position OFFSET without
changing the file pointer. Return the number read, -1 for errors
or 0 for EOF. */
extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
__off64_t __offset) __wur
__fortified_attr_access (__write_only__, 2, 3);
/* Write N bytes of BUF to FD at the given position OFFSET without
changing the file pointer. Return the number written, or -1. */
extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n,
__off64_t __offset) __wur
__attr_access ((__read_only__, 2, 3));
# endif
#endif
/* Create a one-way communication channel (pipe).
If successful, two file descriptors are stored in PIPEDES;
bytes written on PIPEDES[1] can be read from PIPEDES[0].
Returns 0 if successful, -1 if not. */
extern int pipe (int __pipedes[2]) __THROW __wur;
#ifdef __USE_GNU
/* Same as pipe but apply flags passed in FLAGS to the new file
descriptors. */
extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
#endif
/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
If SECONDS is zero, any currently scheduled alarm will be cancelled.
The function returns the number of seconds remaining until the last
alarm scheduled would have signaled, or zero if there wasn't one.
There is no return value to indicate an error, but you can set `errno'
to 0 and check its value after calling `alarm', and this might tell you.
The signal may come late due to processor scheduling. */
extern unsigned int alarm (unsigned int __seconds) __THROW;
/* Make the process sleep for SECONDS seconds, or until a signal arrives
and is not ignored. The function returns the number of seconds less
than SECONDS which it actually slept (thus zero if it slept the full time).
If a signal handler does a `longjmp' or modifies the handling of the
SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
signal afterwards is undefined. There is no return value to indicate
error, but if `sleep' returns SECONDS, it probably didn't work.
This function is a cancellation point and therefore not marked with
__THROW. */
extern unsigned int sleep (unsigned int __seconds);
#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
|| defined __USE_MISC
/* Set an alarm to go off (generating a SIGALRM signal) in VALUE
microseconds. If INTERVAL is nonzero, when the alarm goes off, the
timer is reset to go off every INTERVAL microseconds thereafter.
Returns the number of microseconds remaining before the alarm. */
extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
__THROW;
/* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
or ignored.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int usleep (__useconds_t __useconds);
#endif
/* Suspend the process until a signal arrives.
This always returns -1 and sets `errno' to EINTR.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int pause (void);
/* Change the owner and group of FILE. */
extern int chown (const char *__file, __uid_t __owner, __gid_t __group)
__THROW __nonnull ((1)) __wur;
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
/* Change the owner and group of the file that FD is open on. */
extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
/* Change owner and group of FILE, if it is a symbolic
link the ownership of the symbolic link is changed. */
extern int lchown (const char *__file, __uid_t __owner, __gid_t __group)
__THROW __nonnull ((1)) __wur;
#endif /* Use X/Open Unix. */
#ifdef __USE_ATFILE
/* Change the owner and group of FILE relative to the directory FD is open
on. */
extern int fchownat (int __fd, const char *__file, __uid_t __owner,
__gid_t __group, int __flag)
__THROW __nonnull ((2)) __wur;
#endif /* Use GNU. */
/* Change the process's working directory to PATH. */
extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur;
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
/* Change the process's working directory to the one FD is open on. */
extern int fchdir (int __fd) __THROW __wur;
#endif
/* Get the pathname of the current working directory,
and put it in SIZE bytes of BUF. Returns NULL if the
directory couldn't be determined or SIZE was too small.
If successful, returns BUF. In GNU, if BUF is NULL,
an array is allocated with `malloc'; the array is SIZE
bytes long, unless SIZE == 0, in which case it is as
big as necessary. */
extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
#ifdef __USE_GNU
/* Return a malloc'd string containing the current directory name.
If the environment variable `PWD' is set, and its value is correct,
that value is used. */
extern char *get_current_dir_name (void) __THROW;
#endif
#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
|| defined __USE_MISC
/* Put the absolute pathname of the current working directory in BUF.
If successful, return BUF. If not, put an error message in
BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
extern char *getwd (char *__buf)
__THROW __nonnull ((1)) __attribute_deprecated__ __wur
__attr_access ((__write_only__, 1));
#endif
/* Duplicate FD, returning a new file descriptor on the same file. */
extern int dup (int __fd) __THROW __wur;
/* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
extern int dup2 (int __fd, int __fd2) __THROW;
#ifdef __USE_GNU
/* Duplicate FD to FD2, closing FD2 and making it open on the same
file while setting flags according to FLAGS. */
extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
#endif
/* NULL-terminated array of "NAME=VALUE" environment variables. */
extern char **__environ;
#ifdef __USE_GNU
extern char **environ;
#endif
/* Replace the current process, executing PATH with arguments ARGV and
environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
extern int execve (const char *__path, char *const __argv[],
char *const __envp[]) __THROW __nonnull ((1, 2));
#ifdef __USE_XOPEN2K8
/* Execute the file FD refers to, overlaying the running program image.
ARGV and ENVP are passed to the new program, as for `execve'. */
extern int fexecve (int __fd, char *const __argv[], char *const __envp[])
__THROW __nonnull ((2));
#endif
/* Execute PATH with arguments ARGV and environment from `environ'. */
extern int execv (const char *__path, char *const __argv[])
__THROW __nonnull ((1, 2));
/* Execute PATH with all arguments after PATH until a NULL pointer,
and the argument after that for environment. */
extern int execle (const char *__path, const char *__arg, ...)
__THROW __nonnull ((1, 2));
/* Execute PATH with all arguments after PATH until
a NULL pointer and environment from `environ'. */
extern int execl (const char *__path, const char *__arg, ...)
__THROW __nonnull ((1, 2));
/* Execute FILE, searching in the `PATH' environment variable if it contains
no slashes, with arguments ARGV and environment from `environ'. */
extern int execvp (const char *__file, char *const __argv[])
__THROW __nonnull ((1, 2));
/* Execute FILE, searching in the `PATH' environment variable if
it contains no slashes, with all arguments after FILE until a
NULL pointer and environment from `environ'. */
extern int execlp (const char *__file, const char *__arg, ...)
__THROW __nonnull ((1, 2));
#ifdef __USE_GNU
/* Execute FILE, searching in the `PATH' environment variable if it contains
no slashes, with arguments ARGV and environment from `environ'. */
extern int execvpe (const char *__file, char *const __argv[],
char *const __envp[])
__THROW __nonnull ((1, 2));
#endif
#if defined __USE_MISC || defined __USE_XOPEN
/* Add INC to priority of the current process. */
extern int nice (int __inc) __THROW __wur;
#endif
/* Terminate program execution with the low-order 8 bits of STATUS. */
extern void _exit (int __status) __attribute__ ((__noreturn__));
/* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
the `_SC_*' symbols for the NAME argument to `sysconf';
and the `_CS_*' symbols for the NAME argument to `confstr'. */
#include <bits/confname.h>
/* Get file-specific configuration information about PATH. */
extern long int pathconf (const char *__path, int __name)
__THROW __nonnull ((1));
/* Get file-specific configuration about descriptor FD. */
extern long int fpathconf (int __fd, int __name) __THROW;
/* Get the value of the system variable NAME. */
extern long int sysconf (int __name) __THROW;
#ifdef __USE_POSIX2
/* Get the value of the string-valued system variable NAME. */
extern size_t confstr (int __name, char *__buf, size_t __len) __THROW
__fortified_attr_access (__write_only__, 2, 3);
#endif
/* Get the process ID of the calling process. */
extern __pid_t getpid (void) __THROW;
/* Get the process ID of the calling process's parent. */
extern __pid_t getppid (void) __THROW;
/* Get the process group ID of the calling process. */
extern __pid_t getpgrp (void) __THROW;
/* Get the process group ID of process PID. */
extern __pid_t __getpgid (__pid_t __pid) __THROW;
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
extern __pid_t getpgid (__pid_t __pid) __THROW;
#endif
/* Set the process group ID of the process matching PID to PGID.
If PID is zero, the current process's process group ID is set.
If PGID is zero, the process ID of the process is used. */
extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
/* Both System V and BSD have `setpgrp' functions, but with different
calling conventions. The BSD function is the same as POSIX.1 `setpgid'
(above). The System V function takes no arguments and puts the calling
process in its on group like `setpgid (0, 0)'.
New programs should always use `setpgid' instead.
GNU provides the POSIX.1 function. */
/* Set the process group ID of the calling process to its own PID.
This is exactly the same as `setpgid (0, 0)'. */
extern int setpgrp (void) __THROW;
#endif /* Use misc or X/Open. */
/* Create a new session with the calling process as its leader.
The process group IDs of the session and the calling process
are set to the process ID of the calling process, which is returned. */
extern __pid_t setsid (void) __THROW;
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
/* Return the session ID of the given process. */
extern __pid_t getsid (__pid_t __pid) __THROW;
#endif
/* Get the real user ID of the calling process. */
extern __uid_t getuid (void) __THROW;
/* Get the effective user ID of the calling process. */
extern __uid_t geteuid (void) __THROW;
/* Get the real group ID of the calling process. */
extern __gid_t getgid (void) __THROW;
/* Get the effective group ID of the calling process. */
extern __gid_t getegid (void) __THROW;
/* If SIZE is zero, return the number of supplementary groups
the calling process is in. Otherwise, fill in the group IDs
of its supplementary groups in LIST and return the number written. */
extern int getgroups (int __size, __gid_t __list[]) __THROW __wur
__fortified_attr_access (__write_only__, 2, 1);
#ifdef __USE_GNU
/* Return nonzero iff the calling process is in group GID. */
extern int group_member (__gid_t __gid) __THROW;
#endif
/* Set the user ID of the calling process to UID.
If the calling process is the super-user, set the real
and effective user IDs, and the saved set-user-ID to UID;
if not, the effective user ID is set to UID. */
extern int setuid (__uid_t __uid) __THROW __wur;
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
/* Set the real user ID of the calling process to RUID,
and the effective user ID of the calling process to EUID. */
extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur;
#endif
#ifdef __USE_XOPEN2K
/* Set the effective user ID of the calling process to UID. */
extern int seteuid (__uid_t __uid) __THROW __wur;
#endif /* Use POSIX.1-2001. */
/* Set the group ID of the calling process to GID.
If the calling process is the super-user, set the real
and effective group IDs, and the saved set-group-ID to GID;
if not, the effective group ID is set to GID. */
extern int setgid (__gid_t __gid) __THROW __wur;
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
/* Set the real group ID of the calling process to RGID,
and the effective group ID of the calling process to EGID. */
extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur;
#endif
#ifdef __USE_XOPEN2K
/* Set the effective group ID of the calling process to GID. */
extern int setegid (__gid_t __gid) __THROW __wur;
#endif /* Use POSIX.1-2001. */
#ifdef __USE_GNU
/* Fetch the real user ID, effective user ID, and saved-set user ID,
of the calling process. */
extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
__THROW;
/* Fetch the real group ID, effective group ID, and saved-set group ID,
of the calling process. */
extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
__THROW;
/* Set the real user ID, effective user ID, and saved-set user ID,
of the calling process to RUID, EUID, and SUID, respectively. */
extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
__THROW __wur;
/* Set the real group ID, effective group ID, and saved-set group ID,
of the calling process to RGID, EGID, and SGID, respectively. */
extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
__THROW __wur;
#endif
/* Clone the calling process, creating an exact copy.
Return -1 for errors, 0 to the new process,
and the process ID of the new process to the old process. */
extern __pid_t fork (void) __THROWNL;
#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
|| defined __USE_MISC
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
and the process ID of the new process to the old process. */
extern __pid_t vfork (void) __THROW;
#endif /* Use misc or XPG < 7. */
#ifdef __USE_GNU
/* This is similar to fork, however it does not run the atfork handlers
neither reinitialize any internal locks in multithread case.
Different than fork, _Fork is async-signal-safe. */
extern __pid_t _Fork (void) __THROW;
#endif
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
extern char *ttyname (int __fd) __THROW;
/* Store at most BUFLEN characters of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
__THROW __nonnull ((2)) __wur
__fortified_attr_access (__write_only__, 2, 3);
/* Return 1 if FD is a valid descriptor associated
with a terminal, zero if not. */
extern int isatty (int __fd) __THROW;
#ifdef __USE_MISC
/* Return the index into the active-logins file (utmp) for
the controlling terminal. */
extern int ttyslot (void) __THROW;
#endif
/* Make a link to FROM named TO. */
extern int link (const char *__from, const char *__to)
__THROW __nonnull ((1, 2)) __wur;
#ifdef __USE_ATFILE
/* Like link but relative paths in TO and FROM are interpreted relative
to FROMFD and TOFD respectively. */
extern int linkat (int __fromfd, const char *__from, int __tofd,
const char *__to, int __flags)
__THROW __nonnull ((2, 4)) __wur;
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
/* Make a symbolic link to FROM named TO. */
extern int symlink (const char *__from, const char *__to)
__THROW __nonnull ((1, 2)) __wur;
/* Read the contents of the symbolic link PATH into no more than
LEN bytes of BUF. The contents are not null-terminated.
Returns the number of characters read, or -1 for errors. */
extern ssize_t readlink (const char *__restrict __path,
char *__restrict __buf, size_t __len)
__THROW __nonnull ((1, 2)) __wur
__fortified_attr_access (__write_only__, 2, 3);
#endif /* Use POSIX.1-2001. */
#ifdef __USE_ATFILE
/* Like symlink but a relative path in TO is interpreted relative to TOFD. */
extern int symlinkat (const char *__from, int __tofd,
const char *__to) __THROW __nonnull ((1, 3)) __wur;
/* Like readlink but a relative PATH is interpreted relative to FD. */
extern ssize_t readlinkat (int __fd, const char *__restrict __path,
char *__restrict __buf, size_t __len)
__THROW __nonnull ((2, 3)) __wur
__fortified_attr_access (__write_only__, 3, 4);
#endif
/* Remove the link NAME. */
extern int unlink (const char *__name) __THROW __nonnull ((1));
#ifdef __USE_ATFILE
/* Remove the link NAME relative to FD. */
extern int unlinkat (int __fd, const char *__name, int __flag)
__THROW __nonnull ((2));
#endif
/* Remove the directory PATH. */
extern int rmdir (const char *__path) __THROW __nonnull ((1));
/* Return the foreground process group ID of FD. */
extern __pid_t tcgetpgrp (int __fd) __THROW;
/* Set the foreground process group ID of FD set PGRP_ID. */
extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
/* Return the login name of the user.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern char *getlogin (void);
#ifdef __USE_POSIX199506
/* Return at most NAME_LEN characters of the login name of the user in NAME.
If it cannot be determined or some other error occurred, return the error
code. Otherwise return 0.
This function is a possible cancellation point and therefore not
marked with __THROW. */
extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1))
__fortified_attr_access (__write_only__, 1, 2);
#endif
#ifdef __USE_MISC
/* Set the login name returned by `getlogin'. */
extern int setlogin (const char *__name) __THROW __nonnull ((1));
#endif
#ifdef __USE_POSIX2
/* Get definitions and prototypes for functions to process the
arguments in ARGV (ARGC of them, minus the program name) for
options given in OPTS. */
# include <bits/getopt_posix.h>
#endif
#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
/* Put the name of the current host in no more than LEN bytes of NAME.
The result is null-terminated if LEN is large enough for the full
name and the terminator. */
extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1))
__fortified_attr_access (__write_only__, 1, 2);
#endif
#if defined __USE_MISC
/* Set the name of the current host to NAME, which is LEN bytes long.
This call is restricted to the super-user. */
extern int sethostname (const char *__name, size_t __len)
__THROW __nonnull ((1)) __wur __attr_access ((__read_only__, 1, 2));
/* Set the current machine's Internet number to ID.
This call is restricted to the super-user. */
extern int sethostid (long int __id) __THROW __wur;
/* Get and set the NIS (aka YP) domain name, if any.
Called just like `gethostname' and `sethostname'.
The NIS domain name is usually the empty string when not using NIS. */
extern int getdomainname (char *__name, size_t __len)
__THROW __nonnull ((1)) __wur
__fortified_attr_access (__write_only__, 1, 2);
extern int setdomainname (const char *__name, size_t __len)
__THROW __nonnull ((1)) __wur __attr_access ((__read_only__, 1, 2));
/* Revoke access permissions to all processes currently communicating
with the control terminal, and then send a SIGHUP signal to the process
group of the control terminal. */
extern int vhangup (void) __THROW;
/* Revoke the access of all descriptors currently open on FILE. */
extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur;
/* Enable statistical profiling, writing samples of the PC into at most
SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
is enabled, the system examines the user PC and increments
SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
disable profiling. Returns zero on success, -1 on error. */
extern int profil (unsigned short int *__sample_buffer, size_t __size,
size_t __offset, unsigned int __scale)
__THROW __nonnull ((1));
/* Turn accounting on if NAME is an existing file. The system will then write
a record for each process as it terminates, to this file. If NAME is NULL,
turn accounting off. This call is restricted to the super-user. */
extern int acct (const char *__name) __THROW;
/* Successive calls return the shells listed in `/etc/shells'. */
extern char *getusershell (void) __THROW;
extern void endusershell (void) __THROW; /* Discard cached info. */
extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
/* Put the program in the background, and dissociate from the controlling
terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
redirects stdin, stdout, and stderr to /dev/null. */
extern int daemon (int __nochdir, int __noclose) __THROW __wur;
#endif /* Use misc. */
#if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
/* Make PATH be the root directory (the starting point for absolute paths).
This call is restricted to the super-user. */
extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur;
/* Prompt with PROMPT and read a string from the terminal without echoing.
Uses /dev/tty if possible; otherwise stderr and stdin. */
extern char *getpass (const char *__prompt) __nonnull ((1));
#endif /* Use misc || X/Open. */
/* Make all changes done to FD actually appear on disk.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int fsync (int __fd);
#ifdef __USE_GNU
/* Make all changes done to all files on the file system associated
with FD actually appear on disk. */
extern int syncfs (int __fd) __THROW;
#endif
#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED