| | 1 | .\" Copyright (c) 1980, 1991, 1993 |
| | 2 | .\" The Regents of the University of California. All rights reserved. |
| | 3 | .\" |
| | 4 | .\" Redistribution and use in source and binary forms, with or without |
| | 5 | .\" modification, are permitted provided that the following conditions |
| | 6 | .\" are met: |
| | 7 | .\" 1. Redistributions of source code must retain the above copyright |
| | 8 | .\" notice, this list of conditions and the following disclaimer. |
| | 9 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 10 | .\" notice, this list of conditions and the following disclaimer in the |
| | 11 | .\" documentation and/or other materials provided with the distribution. |
| | 12 | .\" 3. Neither the name of the University nor the names of its contributors |
| | 13 | .\" may be used to endorse or promote products derived from this software |
| | 14 | .\" without specific prior written permission. |
| | 15 | .\" |
| | 16 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 17 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 18 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 19 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 20 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 21 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 22 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 23 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| | 25 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 26 | .\" SUCH DAMAGE. |
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| | 28 | .\" @(#)sticky.8 8.1 (Berkeley) 6/5/93 |
| | 29 | .\" $FreeBSD$ |
| | 30 | .\" |
| | 31 | .Dd June 5, 1993 |
| | 32 | .Dt STICKY 7 |
| | 33 | .Os |
| | 34 | .Sh NAME |
| | 35 | .Nm sticky |
| | 36 | .Nd sticky text and append-only directories |
| | 37 | .Sh DESCRIPTION |
| | 38 | A special file mode, called the |
| | 39 | .Em sticky bit |
| | 40 | (mode S_ISVTX), |
| | 41 | is used to indicate special treatment |
| | 42 | for directories. |
| | 43 | It is ignored for regular files. |
| | 44 | See |
| | 45 | .Xr chmod 2 |
| | 46 | or |
| | 47 | the file |
| | 48 | .In sys/stat.h |
| | 49 | for an explanation of file modes. |
| | 50 | .Sh STICKY DIRECTORIES |
| | 51 | A directory whose `sticky bit' is set |
| | 52 | becomes an append-only directory, or, more accurately, |
| | 53 | a directory in which the deletion of files is restricted. |
| | 54 | A file in a sticky directory may only be removed or renamed |
| | 55 | by a user if the user has write permission for the directory and |
| | 56 | the user is the owner of the file, the owner of the directory, |
| | 57 | or the super-user. |
| | 58 | This feature is usefully applied to directories such as |
| | 59 | .Pa /tmp |
| | 60 | which must be publicly writable but |
| | 61 | should deny users the license to arbitrarily |
| | 62 | delete or rename each others' files. |
| | 63 | .Pp |
| | 64 | Any user may create a sticky directory. |
| | 65 | See |
| | 66 | .Xr chmod 1 |
| | 67 | for details about modifying file modes. |
| | 68 | .Sh HISTORY |
| | 69 | A |
| | 70 | .Nm |
| | 71 | command appeared in |
| | 72 | .At 32v . |
| | 73 | .Sh BUGS |
| | 74 | Neither |
| | 75 | .Xr open 2 |
| | 76 | nor |
| | 77 | .Xr mkdir 2 |
| | 78 | will create a file with the sticky bit set. |
projects / apple / xnu.git / blame_incremental