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342414a6e0
* sysdeps/stub/revoke.c: New file. * misc/Makefile (routines): Add revoke. * posix/unistd.h [__USE_BSD] (revoke): Declare it. * sysdeps/generic/pty.c (openpty, forkpty): Declare return types. (forkpty): Declare login_tty. * misc/logwtmp.c (logwtmp): Declare to return void. * misc/login_tty.c (login_tty): Include unistd.h. Declare return type.
666 lines
24 KiB
C
666 lines
24 KiB
C
/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/*
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* POSIX Standard: 2.10 Symbolic Constants <unistd.h>
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*/
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#ifndef _UNISTD_H
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#define _UNISTD_H 1
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#include <features.h>
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__BEGIN_DECLS
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/* These may be used to determine what facilities are present at compile time.
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Their values can be obtained at run time from sysconf. */
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/* POSIX Standard approved as IEEE Std 1003.1 as of August, 1988. */
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#define _POSIX_VERSION 199009L
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/* These are not #ifdef __USE_POSIX2 because they are
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in the theoretically application-owned namespace. */
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#define _POSIX2_C_VERSION 199912L /* Invalid until 1003.2 is done. */
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/* If defined, the implementation supports the
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C Language Bindings Option. */
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#define _POSIX2_C_BIND 1
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/* If defined, the implementation supports the
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C Language Development Utilities Option. */
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#define _POSIX2_C_DEV 1
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/* If defined, the implementation supports the
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Software Development Utilities Option. */
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#define _POSIX2_SW_DEV 1
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/* Get values of POSIX options:
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If these symbols are defined, the corresponding features are
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always available. If not, they may be available sometimes.
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The current values can be obtained with `sysconf'.
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_POSIX_JOB_CONTROL Job control is supported.
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_POSIX_SAVED_IDS Processes have a saved set-user-ID
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and a saved set-group-ID.
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If any of these symbols is defined as -1, the corresponding option is not
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true for any file. If any is defined as other than -1, the corresponding
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option is true for all files. If a symbol is not defined at all, the value
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for a specific file can be obtained from `pathconf' and `fpathconf'.
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_POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
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the owner of a file. `chown' can only be used
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to change the group ID of a file to a group of
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which the calling process is a member.
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_POSIX_NO_TRUNC Pathname components longer than
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NAME_MAX generate an error.
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_POSIX_VDISABLE If defined, if the value of an element of the
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`c_cc' member of `struct termios' is
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_POSIX_VDISABLE, no character will have the
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effect associated with that element.
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*/
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#include <posix_opt.h>
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/* Standard file descriptors. */
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#define STDIN_FILENO 0 /* Standard input. */
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#define STDOUT_FILENO 1 /* Standard output. */
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#define STDERR_FILENO 2 /* Standard error output. */
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/* All functions that are not declared anywhere else. */
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#include <gnu/types.h>
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#ifndef ssize_t
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#define ssize_t __ssize_t
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#endif
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#define __need_size_t
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#define __need_NULL
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#include <stddef.h>
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/* Values for the second argument to access.
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These may be OR'd together. */
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#define R_OK 4 /* Test for read permission. */
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#define W_OK 2 /* Test for write permission. */
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#define X_OK 1 /* Test for execute permission. */
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#define F_OK 0 /* Test for existence. */
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/* Test for access to NAME using the real UID and real GID. */
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extern int __access __P ((__const char *__name, int __type));
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extern int access __P ((__const char *__name, int __type));
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#ifdef __USE_GNU
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/* Test for access to NAME using the effective UID and GID
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(as normal file operations use). */
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extern int euidaccess __P ((__const char *__name, int __type));
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#endif
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/* Values for the WHENCE argument to lseek. */
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#ifndef _STDIO_H /* <stdio.h> has the same definitions. */
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#define SEEK_SET 0 /* Seek from beginning of file. */
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#define SEEK_CUR 1 /* Seek from current position. */
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#define SEEK_END 2 /* Seek from end of file. */
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#endif
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#if defined (__USE_BSD) && !defined (L_SET)
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/* Old BSD names for the same constants; just for compatibility. */
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#define L_SET SEEK_SET
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#define L_INCR SEEK_CUR
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#define L_XTND SEEK_END
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#endif
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/* Move FD's file position to OFFSET bytes from the
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beginning of the file (if WHENCE is SEEK_SET),
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the current position (if WHENCE is SEEK_CUR),
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or the end of the file (if WHENCE is SEEK_END).
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Return the new file position. */
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extern __off_t __lseek __P ((int __fd, __off_t __offset, int __whence));
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extern __off_t lseek __P ((int __fd, __off_t __offset, int __whence));
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/* Close the file descriptor FD. */
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extern int __close __P ((int __fd));
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extern int close __P ((int __fd));
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/* Read NBYTES into BUF from FD. Return the
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number read, -1 for errors or 0 for EOF. */
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extern ssize_t __read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
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extern ssize_t read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
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/* Write N bytes of BUF to FD. Return the number written, or -1. */
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extern ssize_t __write __P ((int __fd, __const __ptr_t __buf, size_t __n));
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extern ssize_t write __P ((int __fd, __const __ptr_t __buf, size_t __n));
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/* Create a one-way communication channel (pipe).
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If successul, two file descriptors are stored in PIPEDES;
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bytes written on PIPEDES[1] can be read from PIPEDES[0].
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Returns 0 if successful, -1 if not. */
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extern int __pipe __P ((int __pipedes[2]));
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extern int pipe __P ((int __pipedes[2]));
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/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
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If SECONDS is zero, any currently scheduled alarm will be cancelled.
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The function returns the number of seconds remaining until the last
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alarm scheduled would have signaled, or zero if there wasn't one.
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There is no return value to indicate an error, but you can set `errno'
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to 0 and check its value after calling `alarm', and this might tell you.
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The signal may come late due to processor scheduling. */
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extern unsigned int alarm __P ((unsigned int __seconds));
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/* Make the process sleep for SECONDS seconds, or until a signal arrives
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and is not ignored. The function returns the number of seconds less
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than SECONDS which it actually slept (thus zero if it slept the full time).
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If a signal handler does a `longjmp' or modifies the handling of the
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SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
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signal afterwards is undefined. There is no return value to indicate
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error, but if `sleep' returns SECONDS, it probably didn't work. */
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extern unsigned int sleep __P ((unsigned int __seconds));
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/* Suspend the process until a signal arrives.
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This always returns -1 and sets `errno' to EINTR. */
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extern int pause __P ((void));
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/* Change the owner and group of FILE. */
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extern int __chown __P ((__const char *__file,
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__uid_t __owner, __gid_t __group));
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extern int chown __P ((__const char *__file,
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__uid_t __owner, __gid_t __group));
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#ifdef __USE_BSD
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/* Change the owner and group of the file that FD is open on. */
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extern int __fchown __P ((int __fd,
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__uid_t __owner, __gid_t __group));
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extern int fchown __P ((int __fd,
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__uid_t __owner, __gid_t __group));
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#endif /* Use BSD. */
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/* Change the process's working directory to PATH. */
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extern int __chdir __P ((__const char *__path));
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extern int chdir __P ((__const char *__path));
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#ifdef __USE_BSD
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/* Change the process's working directory to the one FD is open on. */
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extern int fchdir __P ((int __fd));
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#endif
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/* Get the pathname of the current working directory,
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and put it in SIZE bytes of BUF. Returns NULL if the
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directory couldn't be determined or SIZE was too small.
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If successful, returns BUF. In GNU, if BUF is NULL,
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an array is allocated with `malloc'; the array is SIZE
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bytes long, unless SIZE <= 0, in which case it is as
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big as necessary. */
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extern char *getcwd __P ((char *__buf, size_t __size));
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#ifdef __USE_GNU
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/* Return a malloc'd string containing the current directory name.
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If the environment variable `PWD' is set, and its value is correct,
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that value is used. */
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extern char *get_current_dir_name __P ((void));
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#endif
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#ifdef __USE_BSD
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/* Put the absolute pathname of the current working directory in BUF.
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If successful, return BUF. If not, put an error message in
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BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
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extern char *getwd __P ((char *__buf));
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#endif
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/* Duplicate FD, returning a new file descriptor on the same file. */
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extern int __dup __P ((int __fd));
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extern int dup __P ((int __fd));
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/* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
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extern int __dup2 __P ((int __fd, int __fd2));
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extern int dup2 __P ((int __fd, int __fd2));
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/* NULL-terminated array of "NAME=VALUE" environment variables. */
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extern char **__environ;
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extern char **environ;
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/* Replace the current process, executing PATH with arguments ARGV and
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environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
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extern int __execve __P ((__const char *__path, char *__const __argv[],
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char *__const __envp[]));
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extern int execve __P ((__const char *__path, char *__const __argv[],
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char *__const __envp[]));
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#ifdef __USE_GNU
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/* Execute the file FD refers to, overlaying the running program image.
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ARGV and ENVP are passed to the new program, as for `execve'. */
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extern int fexecve __P ((int __fd,
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char *const __argv[], char *const __envp[]));
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#endif
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/* Execute PATH with arguments ARGV and environment from `environ'. */
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extern int execv __P ((__const char *__path, char *__const __argv[]));
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/* Execute PATH with all arguments after PATH until a NULL pointer,
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and the argument after that for environment. */
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extern int execle __P ((__const char *__path, __const char *__arg,...));
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/* Execute PATH with all arguments after PATH until
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a NULL pointer and environment from `environ'. */
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extern int execl __P ((__const char *__path, __const char *__arg,...));
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/* Execute FILE, searching in the `PATH' environment variable if it contains
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no slashes, with arguments ARGV and environment from `environ'. */
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extern int execvp __P ((__const char *__file, char *__const __argv[]));
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/* Execute FILE, searching in the `PATH' environment variable if
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it contains no slashes, with all arguments after FILE until a
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NULL pointer and environment from `environ'. */
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extern int execlp __P ((__const char *__file, ...));
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/* Terminate program execution with the low-order 8 bits of STATUS. */
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extern void _exit __P ((int __status)) __attribute__ ((__noreturn__));
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/* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
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the `_SC_*' symbols for the NAME argument to `sysconf';
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and the `_CS_*' symbols for the NAME argument to `confstr'. */
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#include <confname.h>
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/* Get file-specific configuration information about PATH. */
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extern long int __pathconf __P ((__const char *__path, int __name));
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extern long int pathconf __P ((__const char *__path, int __name));
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/* Get file-specific configuration about descriptor FD. */
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extern long int __fpathconf __P ((int __fd, int __name));
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extern long int fpathconf __P ((int __fd, int __name));
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/* Get the value of the system variable NAME. */
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extern long int __sysconf __P ((int __name));
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extern long int sysconf __P ((int __name));
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#ifdef __USE_POSIX2
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/* Get the value of the string-valued system variable NAME. */
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extern size_t confstr __P ((int __name, char *__buf, size_t __len));
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#endif
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/* Get the process ID of the calling process. */
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extern __pid_t __getpid __P ((void));
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extern __pid_t getpid __P ((void));
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/* Get the process ID of the calling process's parent. */
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extern __pid_t __getppid __P ((void));
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extern __pid_t getppid __P ((void));
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/* Get the process group ID of the calling process. */
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extern __pid_t getpgrp __P ((void));
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/* Set the process group ID of the process matching PID to PGID.
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If PID is zero, the current process's process group ID is set.
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If PGID is zero, the process ID of the process is used. */
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extern int setpgid __P ((__pid_t __pid, __pid_t __pgid));
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/* Get the process group ID of process PID. */
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extern __pid_t __getpgid __P ((__pid_t __pid));
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#ifdef __USE_GNU
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extern __pid_t getpgid __P ((__pid_t __pid));
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#endif
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#ifdef __USE_BSD
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/* Another name for `setpgid'. */
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extern int setpgrp __P ((__pid_t __pid, __pid_t __pgrp));
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#endif /* Use BSD. */
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/* Create a new session with the calling process as its leader.
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The process group IDs of the session and the calling process
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are set to the process ID of the calling process, which is returned. */
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extern __pid_t __setsid __P ((void));
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extern __pid_t setsid __P ((void));
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/* Get the real user ID of the calling process. */
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extern __uid_t __getuid __P ((void));
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extern __uid_t getuid __P ((void));
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/* Get the effective user ID of the calling process. */
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extern __uid_t __geteuid __P ((void));
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extern __uid_t geteuid __P ((void));
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/* Get the real group ID of the calling process. */
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extern __gid_t __getgid __P ((void));
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extern __gid_t getgid __P ((void));
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/* Get the effective group ID of the calling process. */
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extern __gid_t __getegid __P ((void));
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extern __gid_t getegid __P ((void));
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/* If SIZE is zero, return the number of supplementary groups
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the calling process is in. Otherwise, fill in the group IDs
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of its supplementary groups in LIST and return the number written. */
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extern int __getgroups __P ((int __size, __gid_t __list[]));
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extern int getgroups __P ((int __size, __gid_t __list[]));
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/* Set the user ID of the calling process to UID.
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If the calling process is the super-user, set the real
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and effective user IDs, and the saved set-user-ID to UID;
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if not, the effective user ID is set to UID. */
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extern int __setuid __P ((__uid_t __uid));
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extern int setuid __P ((__uid_t __uid));
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#ifdef __USE_BSD
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/* Set the real user ID of the calling process to RUID,
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and the effective user ID of the calling process to EUID. */
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extern int __setreuid __P ((__uid_t __ruid, __uid_t __euid));
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extern int setreuid __P ((__uid_t __ruid, __uid_t __euid));
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/* Set the effective user ID of the calling process to UID. */
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extern int seteuid __P ((__uid_t __uid));
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#endif /* Use BSD. */
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/* Set the group ID of the calling process to GID.
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If the calling process is the super-user, set the real
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and effective group IDs, and the saved set-group-ID to GID;
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if not, the effective group ID is set to GID. */
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extern int __setgid __P ((__gid_t __gid));
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extern int setgid __P ((__gid_t __gid));
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#ifdef __USE_BSD
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/* Set the real group ID of the calling process to RGID,
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and the effective group ID of the calling process to EGID. */
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extern int __setregid __P ((__gid_t __rgid, __gid_t __egid));
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extern int setregid __P ((__gid_t __rgid, __gid_t __egid));
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/* Set the effective group ID of the calling process to GID. */
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extern int setegid __P ((__gid_t __gid));
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#endif /* Use BSD. */
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/* Clone the calling process, creating an exact copy.
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Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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extern __pid_t __fork __P ((void));
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extern __pid_t fork __P ((void));
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#ifdef __USE_BSD
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/* Clone the calling process, but without copying the whole address space.
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The the calling process is suspended until the the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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extern __pid_t __vfork __P ((void));
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extern __pid_t vfork __P ((void));
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#endif /* Use BSD. */
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/* Return the pathname of the terminal FD is open on, or NULL on errors.
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The returned storage is good only until the next call to this function. */
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extern char *ttyname __P ((int __fd));
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/* Return 1 if FD is a valid descriptor associated
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with a terminal, zero if not. */
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extern int __isatty __P ((int __fd));
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extern int isatty __P ((int __fd));
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#ifdef __USE_BSD
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/* Return the index into the active-logins file (utmp) for
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the terminal FD is open on. */
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extern int ttyslot ((int __fd));
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#endif
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/* Make a link to FROM named TO. */
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extern int __link __P ((__const char *__from, __const char *__to));
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extern int link __P ((__const char *__from, __const char *__to));
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#ifdef __USE_BSD
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/* Make a symbolic link to FROM named TO. */
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extern int __symlink __P ((__const char *__from, __const char *__to));
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extern int symlink __P ((__const char *__from, __const char *__to));
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/* Read the contents of the symbolic link PATH into no more than
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LEN bytes of BUF. The contents are not null-terminated.
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Returns the number of characters read, or -1 for errors. */
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extern int __readlink __P ((__const char *__path, char *__buf, size_t __len));
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extern int readlink __P ((__const char *__path, char *__buf, size_t __len));
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#endif /* Use BSD. */
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/* Remove the link NAME. */
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extern int __unlink __P ((__const char *__name));
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extern int unlink __P ((__const char *__name));
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/* Remove the directory PATH. */
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extern int __rmdir __P ((__const char *__path));
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extern int rmdir __P ((__const char *__path));
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/* Return the foreground process group ID of FD. */
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extern __pid_t tcgetpgrp __P ((int __fd));
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/* Set the foreground process group ID of FD set PGRP_ID. */
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extern int tcsetpgrp __P ((int __fd, __pid_t __pgrp_id));
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/* Return the login name of the user. */
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extern char *getlogin __P ((void));
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#ifdef __USE_BSD
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/* Set the login name returned by `getlogin'. */
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extern int setlogin __P ((__const char *__name));
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#endif
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#ifdef __USE_POSIX2
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/* Process the arguments in ARGV (ARGC of them, minus
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the program name) for options given in OPTS.
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If `opterr' is zero, no messages are generated
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for invalid options; it defaults to 1.
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`optind' is the current index into ARGV.
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`optarg' is the argument corresponding to the current option.
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Return the option character from OPTS just read.
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Return -1 when there are no more options.
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For unrecognized options, or options missing arguments,
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`optopt' is set to the option letter, and '?' is returned.
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The OPTS string is a list of characters which are recognized option
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letters, optionally followed by colons, specifying that that letter
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takes an argument, to be placed in `optarg'.
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If a letter in OPTS is followed by two colons, its argument is optional.
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This behavior is specific to the GNU `getopt'.
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The argument `--' causes premature termination of argument scanning,
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explicitly telling `getopt' that there are no more options.
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If OPTS begins with `--', then non-option arguments
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are treated as arguments to the option '\0'.
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This behavior is specific to the GNU `getopt'. */
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extern int getopt __P ((int __argc, char *__const * __argv,
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__const char *__opts));
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extern int opterr;
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extern int optind;
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extern int optopt;
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extern char *optarg;
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#endif
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#ifdef __USE_BSD
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/* Put the name of the current host in no more than LEN bytes of NAME.
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The result is null-terminated if LEN is large enough for the full
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name and the terminator. */
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extern int __gethostname __P ((char *__name, size_t __len));
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extern int gethostname __P ((char *__name, size_t __len));
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/* Set the name of the current host to NAME, which is LEN bytes long.
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This call is restricted to the super-user. */
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extern int sethostname __P ((__const char *__name, size_t __len));
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/* Return the current machine's Internet number. */
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extern long int gethostid __P ((void));
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/* Set the current machine's Internet number to ID.
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This call is restricted to the super-user. */
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extern int sethostid __P ((long int __id));
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/* Return the number of bytes in a page. This is the system's page size,
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which is not necessarily the same as the hardware page size. */
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extern size_t __getpagesize __P ((void));
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extern size_t getpagesize __P ((void));
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/* Return the maximum number of file descriptors
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the current process could possibly have. */
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extern int __getdtablesize __P ((void));
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extern int getdtablesize __P ((void));
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/* Truncate FILE to LENGTH bytes. */
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extern int truncate __P ((__const char *__file, __off_t __length));
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/* Truncate the file FD is open on to LENGTH bytes. */
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extern int ftruncate __P ((int __fd, __off_t __length));
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/* Make all changes done to FD actually appear on disk. */
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extern int fsync __P ((int __fd));
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/* Make all changes done to all files actually appear on disk. */
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extern int sync __P ((void));
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/* 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 __P ((void));
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/* Revoke the access of all descriptors currently open on FILE. */
|
|
extern int revoke __P ((const char *__file));
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/* 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,
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|
turn accounting off. This call is restricted to the super-user. */
|
|
extern int acct __P ((__const char *__name));
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|
|
/* Make PATH be the root directory (the starting point for absolute paths).
|
|
This call is restricted to the super-user. */
|
|
extern int chroot __P ((__const char *__path));
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|
|
/* Make the block special device PATH available to the system for swapping.
|
|
This call is restricted to the super-user. */
|
|
extern int swapon __P ((__const char *__path));
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|
|
/* Reboot or halt the system. */
|
|
extern int reboot __P ((int __howto));
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/* Successive calls return the shells listed in `/etc/shells'. */
|
|
extern char *getusershell __P ((void));
|
|
extern void endusershell __P ((void)); /* Discard cached info. */
|
|
extern void setusershell __P ((void)); /* Rewind and re-read the file. */
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/* Prompt with PROMPT and read a string from the terminal without echoing.
|
|
Uses /dev/tty if possible; otherwise stderr and stdin. */
|
|
extern char *getpass __P ((const char *__prompt));
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|
|
/* 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 __P ((int __nochdir, int __noclose));
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|
|
|
#endif /* Use BSD. */
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|
|
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|
#ifdef __USE_MISC
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|
|
|
/* Generate a unique temporary file name from TEMPLATE.
|
|
The last six characters of TEMPLATE must be "XXXXXX";
|
|
they are replaced with a string that makes the file name unique.
|
|
Returns TEMPLATE, or a null pointer if it cannot get a unique file name. */
|
|
extern char *mktemp __P ((char *__template));
|
|
|
|
/* Generate a unique temporary file name from TEMPLATE.
|
|
The last six characters of TEMPLATE must be "XXXXXX";
|
|
they are replaced with a string that makes the filename unique.
|
|
Returns a file descriptor open on the file for reading and writing,
|
|
or -1 if it cannot create a uniquely-named file. */
|
|
extern int mkstemp __P ((char *__template));
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/* 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).
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|
|
|
In Mach, all system calls take normal arguments and always return an
|
|
error code (zero for success). */
|
|
extern int syscall __P ((int __sysno, ...));
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|
|
#endif /* Use misc. */
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|
#if defined (__USE_MISC) && !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. */
|
|
|
|
extern int lockf __P ((int __fd, int __cmd, __off_t __len));
|
|
#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) \
|
|
({ long int __result; \
|
|
do __result = (long int) (expression); \
|
|
while (__result == -1L && errno == EINTR); \
|
|
__result; })
|
|
|
|
#endif
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* unistd.h */
|