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/* Copyright (C) 1991-1999, 2000, 2001 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/*

 *      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'.  */

/* POSIX Standard approved as ISO/IEC 9945-1 as of August, 1988 and

   extended by POSIX-1b (aka POSIX-4) and POSIX-1c (aka POSIX threads).  */

#define _POSIX_VERSION  199506L

/* These are not #ifdef __USE_POSIX2 because they are

   in the theoretically application-owned namespace.  */

/* POSIX Standard approved as ISO/IEC 9945-2 as of December, 1993.  */

#define _POSIX2_C_VERSION       199209L

/* The utilities on GNU systems also correspond to this version.  */

#define _POSIX2_VERSION 199209L

/* If defined, the implementation supports the

   C Language Bindings Option.  */

#define _POSIX2_C_BIND  1

/* If defined, the implementation supports the

   C Language Development Utilities Option.  */

#define _POSIX2_C_DEV   1

/* If defined, the implementation supports the

   Software Development Utilities Option.  */

#define _POSIX2_SW_DEV  1

/* If defined, the implementation supports the

   creation of locales with the localedef utility.  */

#define _POSIX2_LOCALEDEF       1

/* X/Open version number to which the library conforms.  It is selectable.  */

#ifdef __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

/* Encryption is present.  */

#define _XOPEN_CRYPT    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.  */

#ifdef __USE_UNIX98

# 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>

#ifdef __USE_XOPEN

/* 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_MISC || defined __USE_XOPEN_EXTENDED

# ifndef __intptr_t_defined

typedef __intptr_t intptr_t;

#  define __intptr_t_defined

# endif

#endif

#if defined __USE_BSD || 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;

#if 0

/*#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;

#endif

/* 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.  */

#endif

#if defined __USE_BSD && !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

extern __off64_t __REDIRECT (lseek,

                             (int __fd, __off64_t __offset, int __whence)

                             __THROW,

                             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.  */

extern int close (int __fd) __THROW;

/* Read NBYTES into BUF from FD.  Return the

   number read, -1 for errors or 0 for EOF.  */

extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __THROW;

/* Write N bytes of BUF to FD.  Return the number written, or -1.  */

extern ssize_t write (int __fd, __const void *__buf, size_t __n) __THROW;

#ifdef __USE_UNIX98

# ifndef __USE_FILE_OFFSET64

extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)

     __THROW;

extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,

                       __off_t __offset) __THROW;

# else

#  ifdef __REDIRECT

extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,

                                   __off64_t __offset) __THROW,

                           pread64);

extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,

                                    size_t __nbytes, __off64_t __offset)

                           __THROW,

                        pwrite64);

#  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) __THROW;

/* 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) __THROW;

# 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;

/* 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.  */

extern unsigned int sleep (unsigned int __seconds) __THROW;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* 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.  */

extern int usleep (__useconds_t __useconds) __THROW;

#endif

/* Suspend the process until a signal arrives.

   This always returns -1 and sets `errno' to EINTR.  */

extern int pause (void) __THROW;

/* Change the owner and group of FILE.  */

extern int chown (__const char *__file, __uid_t __owner, __gid_t __group)

     __THROW;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* 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;

/* 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;

#endif /* Use BSD || X/Open Unix.  */

/* Change the process's working directory to PATH.  */

extern int chdir (__const char *__path) __THROW;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* Change the process's working directory to the one FD is open on.  */

extern int fchdir (int __fd) __THROW;

#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;

/* 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;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* 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;

#endif

/* Duplicate FD, returning a new file descriptor on the same file.  */

extern int dup (int __fd) __THROW;

/* Duplicate FD to FD2, closing FD2 and making it open on the same file.  */

extern int dup2 (int __fd, int __fd2) __THROW;

/* 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;

#if 0

/*#ifdef __USE_GNU*/

/* 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;

#endif

/* Execute PATH with arguments ARGV and environment from `environ'.  */

extern int execv (__const char *__path, char *__const __argv[]) __THROW;

/* 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;

/* 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;

/* 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;

/* 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;

#if defined __USE_MISC || defined __USE_XOPEN

/* Add INC to priority of the current process.  */

extern int nice (int __inc) __THROW;

#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;

/* 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 __attribute__ ((__const__));

#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;

#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.

   This function is different on old BSD. */

#ifndef __FAVOR_BSD

extern __pid_t getpgrp (void) __THROW;

#else

# ifdef __REDIRECT

extern __pid_t __REDIRECT (getpgrp, (__pid_t __pid) __THROW, __getpgid);

# else

#  define getpgrp __getpgid

# endif

#endif

/* Get the process group ID of process PID.  */

extern __pid_t __getpgid (__pid_t __pid) __THROW;

#ifdef __USE_XOPEN_EXTENDED

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_SVID || defined __USE_BSD || 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.

   The default in GNU is to provide the System V function.  The BSD

   function is available under -D_BSD_SOURCE.  */

# ifndef __FAVOR_BSD

/* 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;

# else

/* Another name for `setpgid' (above).  */

#  ifdef __REDIRECT

extern int __REDIRECT (setpgrp, (__pid_t __pid, __pid_t __pgrp) __THROW,

                       setpgid);

#  else

#   define setpgrp setpgid

#  endif

# endif /* Favor BSD.  */

#endif  /* Use SVID or BSD.  */

/* 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;

#ifdef __USE_XOPEN_EXTENDED

/* 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;

#if 0

/*#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;

#if defined __USE_BSD || 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;

#endif

#if defined __USE_BSD || defined __USE_XOPEN2K

/* Set the effective user ID of the calling process to UID.  */

extern int seteuid (__uid_t __uid) __THROW;

#endif /* Use BSD.  */

/* 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;

#if defined __USE_BSD || 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;

#endif

#if defined __USE_BSD || defined __USE_XOPEN2K

/* Set the effective group ID of the calling process to GID.  */

extern int setegid (__gid_t __gid) __THROW;

#endif /* Use BSD.  */

#ifdef __USE_GNU

/* Fetch the effective user ID, real user ID, and saved-set user ID,

   of the calling process.  */

extern int getresuid (__uid_t *__euid, __uid_t *__ruid, __uid_t *__suid);

/* Fetch the effective group ID, real group ID, and saved-set group ID,

   of the calling process.  */

extern int getresgid (__gid_t *__egid, __gid_t *__rgid, __gid_t *__sgid);

/* Set the effective user ID, real user ID, and saved-set user ID,

   of the calling process to EUID, RUID, and SUID, respectively.  */

extern int setresuid (__uid_t __euid, __uid_t __ruid, __uid_t __suid);

/* Set the effective group ID, real group ID, and saved-set group ID,

   of the calling process to EGID, RGID, and SGID, respectively.  */

extern int setresgid (__gid_t __egid, __gid_t __rgid, __gid_t __sgid);

#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) __THROW;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* 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 BSD. */

/* 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;

/* Return 1 if FD is a valid descriptor associated

   with a terminal, zero if not.  */

extern int isatty (int __fd) __THROW;

#if defined __USE_BSD \

    || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)

/* 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;

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

/* Make a symbolic link to FROM named TO.  */

extern int symlink (__const char *__from, __const char *__to) __THROW;

/* 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 int readlink (__const char *__restrict __path, char *__restrict __buf,

                     size_t __len) __THROW;

#endif /* Use BSD.  */

/* Remove the link NAME.  */

extern int unlink (__const char *__name) __THROW;

/* Remove the directory PATH.  */

extern int rmdir (__const char *__path) __THROW;

/* 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.  */

extern char *getlogin (void) __THROW;

#if defined __USE_REENTRANT || defined __USE_UNIX98

/* 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.  */

extern int getlogin_r (char *__name, size_t __name_len) __THROW;

#endif

#ifdef  __USE_BSD

/* Set the login name returned by `getlogin'.  */

extern int setlogin (__const char *__name) __THROW;

#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.  */

# define __need_getopt

# include <bits/getopt.h>

#endif

#if defined __USE_BSD || defined __USE_UNIX98

/* 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;

#endif

#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)

/* 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;

/* Set the current machine's Internet number to ID.

   This call is restricted to the super-user.  */

extern int sethostid (long int __id) __THROW;

/* 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;

extern int setdomainname (__const char *__name, size_t __len) __THROW;

/* 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;

/* 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,