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Annotation of 43BSDTahoe/man/man8/sticky.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)sticky.8    6.3 (Berkeley) 5/26/86
        !             6: .\"
        !             7: .TH STICKY 8 "May 26, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: sticky \- persistent text and append-only directories
        !            11: .SH DESCRIPTION
        !            12: The
        !            13: .I "sticky bit"
        !            14: (file mode bit 01000, see
        !            15: .IR chmod (2))
        !            16: is used to indicate special treatment
        !            17: for certain executable files and directories.
        !            18: .SH "STICKY TEXT EXECUTABLE FILES"
        !            19: While the `sticky bit'
        !            20: is set on a sharable executable file,
        !            21: the text of that file will not be removed from the system swap area.
        !            22: Thus the file does not have to be fetched from the file system
        !            23: upon each execution.
        !            24: Shareable text segments are normally placed
        !            25: in a least-frequently-used cache after use,
        !            26: and thus the `sticky bit' has little effect on commonly-used text images.
        !            27: .PP
        !            28: Sharable executable files are made by the
        !            29: .B \-n
        !            30: and
        !            31: .B \-z
        !            32: options of
        !            33: .IR ld (1).
        !            34: .PP
        !            35: Only the super-user can set the sticky bit
        !            36: on a sharable executable file.
        !            37: .SH "STICKY DIRECTORIES"
        !            38: A directory whose `sticky bit' is set
        !            39: becomes an append-only directory, or, more accurately,
        !            40: a directory in which the deletion of files is restricted.
        !            41: A file in a sticky directory may only be removed or renamed
        !            42: by a user if the user has write permission for the directory and
        !            43: the user is the owner of the file, the owner of the directory,
        !            44: or the super-user.
        !            45: This feature is usefully applied to directories such as /tmp
        !            46: which must be publicly writable but
        !            47: should deny users the license to arbitrarily
        !            48: delete or rename each others' files.
        !            49: .PP
        !            50: Any user may create a sticky directory.
        !            51: See
        !            52: .IR chmod (1)
        !            53: for details about modifying file modes.
        !            54: .SH BUGS
        !            55: Since the text areas of sticky text executables are stashed in the swap area,
        !            56: abuse of the feature can cause a system to run out of swap.
        !            57: .PP
        !            58: Neither
        !            59: .IR open (2)
        !            60: nor
        !            61: .IR mkdir (2)
        !            62: will create a file with the sticky bit set.

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