.\" $NetBSD: revoke.2,v 1.3 1995/10/12 15:41:11 jtc Exp $ .\" .\" Copyright (c) 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" Berkeley Software Design, Inc. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)revoke.2 8.1 (Berkeley) 6/4/93 .\" .Dd June 4, 1993 .Dt REVOKE 2 .Os .Sh NAME .Nm revoke .Nd revoke file access .Sh SYNOPSIS .Fd #include <unistd.h> .Ft int .Fn revoke "const char *path" .Sh DESCRIPTION The .Nm revoke function invalidates all current open file descriptors in the system for the file named by .Fa path . Subsequent operations on any such descriptors fail, with the exceptions that a .Fn read from a character device file which has been revoked returns a count of zero (end of file), and a .Fn close call will succeed. If the file is a special file for a device which is open, the device close function is called as if all open references to the file had been closed. .Pp Access to a file may be revoked only by its owner or the super user. The .Nm revoke function is currently supported only for block and character special device files. It is normally used to prepare a terminal device for a new login session, preventing any access by a previous user of the terminal. .Sh RETURN VALUES A 0 value indicated that the call succeeded. A \-1 return value indicates an error occurred and .Va errno is set to indicated the reason. .Sh ERRORS Access to the named file is revoked unless one of the following: .Bl -tag -width Er .It Bq Er ENOTDIR A component of the path prefix is not a directory. .It Bq Er ENAMETOOLONG A component of a pathname exceeded 255 characters, or an entire path name exceeded 1024 characters. .It Bq Er ENOENT The named file or a component of the path name does not exist. .It Bq Er EACCES Search permission is denied for a component of the path prefix. .It Bq Er ELOOP Too many symbolic links were encountered in translating the pathname. .It Bq Er EFAULT .Fa Path points outside the process's allocated address space. .It Bq Er EINVAL The named file is neither a character special or block special file. .It Bq Er EPERM The caller is neither the owner of the file nor the super user. .It Bq Er ENOTSUP The path does not represent a block or character device. .It Bq Er EBUSY The path represents a block device which is providing the backing for a mounted volume. .El .Sh SEE ALSO .Xr close 2 .Sh HISTORY The .Nm revoke function was introduced in .Bx 4.3 Reno .