108 lines
3.6 KiB
Groff
108 lines
3.6 KiB
Groff
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.\" $NetBSD: revoke.2,v 1.12 2003/08/07 16:44:05 agc Exp $
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.\"
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.\" 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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.\"
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.Dd March 22, 1999
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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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.Nm revoke
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function 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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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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.Pp
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Access to a file may be revoked only by its owner or the super user.
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.Pp
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.Nm revoke
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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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A 0 value indicates that the call succeeded.
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A \-1 return value indicates an error occurred and
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.Va errno
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is set to indicate the reason.
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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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.Fa path
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points outside the process's allocated address space.
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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 close 2 ,
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.Xr dup 2 ,
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.Xr fcntl 2 ,
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.Xr flock 2 ,
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.Xr fstat 2 ,
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.Xr read 2 ,
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.Xr write 2
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.Sh HISTORY
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The
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.Nm revoke
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function was introduced in
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.Bx 4.3 Reno .
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