fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
111 lines
3.8 KiB
Groff
111 lines
3.8 KiB
Groff
.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Berkeley Software Design, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)revoke.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd Jan 25, 2016
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.Dt REVOKE 2
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.Os
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.Sh NAME
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.Nm revoke
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.Nd revoke file access
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn revoke "const char *path"
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.Sh DESCRIPTION
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The
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.Fn revoke
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system call invalidates all current open file descriptors in the system
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for the file named by
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.Fa path .
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Subsequent operations on any such descriptors
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fail, with the exceptions that a
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.Fn read
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from a character device file which has been revoked
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returns a count of zero (end of file),
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and a
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.Fn close
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system call will succeed.
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If the file is a special file for a device which is open,
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the device close function
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is called as if all open references to the file had been closed
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using a special close method which does not block.
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.Pp
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Access to a file may be revoked only by its owner or the super user.
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The
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.Fn revoke
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system call is currently supported only for block and character special
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device files.
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It is normally used to prepare a terminal device for a new login session,
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preventing any access by a previous user of the terminal.
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.Sh RETURN VALUES
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.Rv -std revoke
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.Sh ERRORS
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Access to the named file is revoked unless one of the following:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1024 characters.
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.It Bq Er ENOENT
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The named file or a component of the path name does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EFAULT
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The
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.Fa path
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argument
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points outside the process's allocated address space.
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.It Bq Er EINVAL
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The implementation does not support the
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.Fn revoke
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operation on the named file.
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.It Bq Er EPERM
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The caller is neither the owner of the file nor the super user.
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.El
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.Sh SEE ALSO
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.Xr revoke 1 ,
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.Xr close 2
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.Sh HISTORY
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The
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.Fn revoke
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system call first appeared in
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.Bx 4.3 Reno .
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.Sh BUGS
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The non-blocking close method is only correctly implemented for
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terminal devices.
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