1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Berkeley Software Design, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)revoke.2 8.1 (Berkeley) 6/4/93 36.\" 37.Dd June 4, 1993 38.Dt REVOKE 2 39.Os 40.Sh NAME 41.Nm revoke 42.Nd revoke file access 43.Sh SYNOPSIS 44.Ft int 45.Fn revoke "char *path" 46.Sh DESCRIPTION 47The 48.Nm revoke 49function invalidates all current open file descriptors in the system 50for the file named by 51.Fa path . 52Subsequent operations on any such descriptors 53fail, with the exceptions that a 54.Fn read 55from a character device file which has been revoked 56returns a count of zero (end of file), 57and a 58.Fn close 59call will succeed. 60If the file is a special file for a device which is open, 61the device close function 62is called as if all open references to the file had been closed. 63.Pp 64Access to a file may be revoked only by its owner or the super user. 65The 66.Nm revoke 67function is currently supported only for block and character special 68device files. 69It is normally used to prepare a terminal device for a new login session, 70preventing any access by a previous user of the terminal. 71.Sh RETURN VALUES 72A 0 value indicated that the call succeeded. A \-1 return value 73indicates an error occurred and 74.Va errno 75is set to indicated the reason. 76.Sh ERRORS 77Access to the named file is revoked unless one of the following: 78.Bl -tag -width Er 79.It Bq Er ENOTDIR 80A component of the path prefix is not a directory. 81.It Bq Er ENAMETOOLONG 82A component of a pathname exceeded 255 characters, 83or an entire path name exceeded 1024 characters. 84.It Bq Er ENOENT 85The named file or a component of the path name does not exist. 86.It Bq Er EACCES 87Search permission is denied for a component of the path prefix. 88.It Bq Er ELOOP 89Too many symbolic links were encountered in translating the pathname. 90.It Bq Er EFAULT 91.Fa Path 92points outside the process's allocated address space. 93.It Bq Er EINVAL 94The named file is neither a character special or block 95special file. 96.It Bq Er EPERM 97The caller is neither the owner of the file nor the super user. 98.El 99.Sh SEE ALSO 100.Xr close 2 101.Sh HISTORY 102The 103.Nm revoke 104function was introduced in 105.Bx 4.3 Reno . 106