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.\" $FreeBSD: src/lib/libc/sys/revoke.2,v 1.7.2.3 2001/12/14 18:34:01 ru Exp $ 37.\" $DragonFly: src/lib/libc/sys/revoke.2,v 1.2 2003/06/17 04:26:47 dillon Exp $ 38.\" 39.Dd June 4, 1993 40.Dt REVOKE 2 41.Os 42.Sh NAME 43.Nm revoke 44.Nd revoke file access 45.Sh LIBRARY 46.Lb libc 47.Sh SYNOPSIS 48.In unistd.h 49.Ft int 50.Fn revoke "const char *path" 51.Sh DESCRIPTION 52The 53.Fn revoke 54function invalidates all current open file descriptors in the system 55for the file named by 56.Fa path . 57Subsequent operations on any such descriptors 58fail, with the exceptions that a 59.Fn read 60from a character device file which has been revoked 61returns a count of zero (end of file), 62and a 63.Fn close 64call will succeed. 65If the file is a special file for a device which is open, 66the device close function 67is called as if all open references to the file had been closed. 68.Pp 69Access to a file may be revoked only by its owner or the super user. 70The 71.Fn revoke 72function is currently supported only for block and character special 73device files. 74It is normally used to prepare a terminal device for a new login session, 75preventing any access by a previous user of the terminal. 76.Sh RETURN VALUES 77.Rv -std revoke 78.Sh ERRORS 79Access to the named file is revoked unless one of the following: 80.Bl -tag -width Er 81.It Bq Er ENOTDIR 82A component of the path prefix is not a directory. 83.It Bq Er ENAMETOOLONG 84A component of a pathname exceeded 255 characters, 85or an entire path name exceeded 1024 characters. 86.It Bq Er ENOENT 87The named file or a component of the path name does not exist. 88.It Bq Er EACCES 89Search permission is denied for a component of the path prefix. 90.It Bq Er ELOOP 91Too many symbolic links were encountered in translating the pathname. 92.It Bq Er EFAULT 93.Fa Path 94points outside the process's allocated address space. 95.It Bq Er EINVAL 96The implementation does not support the 97.Fn revoke 98operation on the named file. 99.It Bq Er EPERM 100The caller is neither the owner of the file nor the super user. 101.El 102.Sh SEE ALSO 103.Xr close 2 104.Sh HISTORY 105The 106.Fn revoke 107function was introduced in 108.Bx 4.3 Reno . 109