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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;
- #if 0
- /*#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_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. */
- /* 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 <getopt.h>
- #endif
- #if defined __USE_BSD || 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;
- #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,
- size_t __offset, unsigned int __scale) __THROW;
- /* 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;
- #endif /* Use BSD || X/Open. */
- #if defined __USE_BSD || (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;
- /* 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) __THROW;
- #endif /* Use BSD || X/Open. */
- #if defined __USE_BSD || defined __USE_XOPEN
- /* Make all changes done to FD actually appear on disk. */
- extern int fsync (int __fd) __THROW;
- #endif /* Use BSD || X/Open. */
- #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- /* Return the current machine's Internet number. */
- extern long int gethostid (void) __THROW;
- /* Make all changes done to all files actually appear on disk. */
- extern void sync (void) __THROW;
- /* Return the number of bytes in a page. This is the system's page size,
- which is not necessarily the same as the hardware page size. */
- extern int getpagesize (void) __THROW __attribute__ ((__const__));
- /* Truncate FILE to LENGTH bytes. */
- # ifndef __USE_FILE_OFFSET64
- extern int truncate (__const char *__file, __off_t __length) __THROW;
- # else
- # ifdef __REDIRECT
- extern int __REDIRECT (truncate,
- (__const char *__file, __off64_t __length) __THROW,
- truncate64);
- # else
- # define truncate truncate64
- # endif
- # endif
- # ifdef __USE_LARGEFILE64
- extern int truncate64 (__const char *__file, __off64_t __length) __THROW;
- # endif
- /* Truncate the file FD is open on to LENGTH bytes. */
- # ifndef __USE_FILE_OFFSET64
- extern int ftruncate (int __fd, __off_t __length) __THROW;
- # else
- # ifdef __REDIRECT
- extern int __REDIRECT (ftruncate, (int __fd, __off64_t __length) __THROW,
- ftruncate64);
- # else
- # define ftruncate ftruncate64
- # endif
- # endif
- # ifdef __USE_LARGEFILE64
- extern int ftruncate64 (int __fd, __off64_t __length) __THROW;
- # endif
- /* Return the maximum number of file descriptors
- the current process could possibly have. */
- extern int getdtablesize (void) __THROW;
- #endif /* Use BSD || X/Open Unix. */
- #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
- /* Set the end of accessible data space (aka "the break") to ADDR.
- Returns zero on success and -1 for errors (with errno set). */
- extern int brk (void *__addr) __THROW;
- /* Increase or decrease the end of accessible data space by DELTA bytes.
- If successful, returns the address the previous end of data space
- (i.e. the beginning of the new space, if DELTA > 0);
- returns (void *) -1 for errors (with errno set). */
- extern void *sbrk (intptr_t __delta) __THROW;
- #endif
- #ifdef __USE_MISC
- /* Invoke `system call' number SYSNO, passing it the remaining arguments.
- This is completely system-dependent, and not often useful.
- In Unix, `syscall' sets `errno' for all errors and most calls return -1
- for errors; in many systems you cannot pass arguments or get return
- values for all system calls (`pipe', `fork', and `getppid' typically
- among them).
- In Mach, all system calls take normal arguments and always return an
- error code (zero for success). */
- extern long int syscall (long int __sysno, ...) __THROW;
- #endif /* Use misc. */
- #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
- /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
- files consistent. Some systems have them there and some here, and some
- software depends on the macros being defined without including both. */
- /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
- LEN is always relative to the current file position.
- The CMD argument is one of the following. */
- # define F_ULOCK 0 /* Unlock a previously locked region. */
- # define F_LOCK 1 /* Lock a region for exclusive use. */
- # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
- # define F_TEST 3 /* Test a region for other processes locks. */
- # ifndef __USE_FILE_OFFSET64
- extern int lockf (int __fd, int __cmd, __off_t __len) __THROW;
- # else
- # ifdef __REDIRECT
- extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len) __THROW,
- lockf64);
- # else
- # define lockf lockf64
- # endif
- # endif
- # ifdef __USE_LARGEFILE64
- extern int lockf64 (int __fd, int __cmd, __off64_t __len) __THROW;
- # endif
- #endif /* Use misc and F_LOCK not already defined. */
- #ifdef __USE_GNU
- /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
- set to EINTR. */
- # define TEMP_FAILURE_RETRY(expression) \
- (__extension__ \
- ({ long int __result; \
- do __result = (long int) (expression); \
- while (__result == -1L && errno == EINTR); \
- __result; }))
- #endif
- #if defined __USE_POSIX199309 || defined __USE_UNIX98
- /* Synchronize at least the data part of a file with the underlying
- media. */
- extern int fdatasync (int __fildes) __THROW;
- #endif /* Use POSIX199309 */
- /* XPG4.2 specifies that prototypes for the encryption functions must
- be defined here. */
- #ifdef __USE_XOPEN
- /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
- extern char *crypt (__const char *__key, __const char *__salt) __THROW;
- /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
- block in place. */
- extern void encrypt (char *__block, int __edflag) __THROW;
- /* Swab pairs bytes in the first N bytes of the area pointed to by
- FROM and copy the result to TO. The value of TO must not be in the
- range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
- is without partner. */
- extern void swab (__const void *__restrict __from, void *__restrict __to,
- ssize_t __n) __THROW;
- #endif
- /* The Single Unix specification demands this prototype to be here.
- It is also found in <stdio.h>. */
- #ifdef __USE_XOPEN
- /* Return the name of the controlling terminal. */
- extern char *ctermid (char *__s) __THROW;
- #endif
- #ifdef __USE_POSIX199309
- /* This function is only available if the system has POSIX threads. */
- /* Install handlers to be called when a new process is created with FORK.
- The PREPARE handler is called in the parent process just before performing
- FORK. The PARENT handler is called in the parent process just after FORK.
- The CHILD handler is called in the child process. Each of the three
- handlers can be NULL, meaning that no handler needs to be called at that
- point.
- PTHREAD_ATFORK can be called several times, in which case the PREPARE
- handlers are called in LIFO order (last added with PTHREAD_ATFORK,
- first called before FORK), and the PARENT and CHILD handlers are called
- in FIFO (first added, first called). */
- extern int pthread_atfork (void (*__prepare) (void),
- void (*__parent) (void),
- void (*__child) (void)) __THROW;
- #endif
- __END_DECLS
- #endif /* unistd.h */
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