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Annotation of researchv10dc/man/manb/sticky.8, revision 1.1

1.1     ! root        1: .TH STICKY 8
        !             2: .UC 4
        !             3: .SH NAME
        !             4: sticky \- executable files with persistent text
        !             5: .SH DESCRIPTION
        !             6: While the `sticky bit', mode 01000 (see
        !             7: .IR chmod (2)),
        !             8: is set on a sharable executable file,
        !             9: the text of that file will not be removed from the system swap area.
        !            10: Thus the file does not have to be fetched from the file system
        !            11: upon each execution.
        !            12: As long as a copy remains in the swap area, the
        !            13: original text cannot be overwritten in the file system,
        !            14: nor can the file be deleted.
        !            15: (Directory entries can be removed so long as one link remains.)
        !            16: .PP
        !            17: Sharable files are made by the
        !            18: .B \-n
        !            19: and
        !            20: .B \-z
        !            21: options of
        !            22: .IR ld (1).
        !            23: .PP
        !            24: To replace a sticky file that has been used do:
        !            25: (1) Clear the sticky bit with
        !            26: .IR chmod (1).
        !            27: (2) Execute the old program to flush the swapped copy.
        !            28: This can be done safely even if others are using it.
        !            29: (3) Overwrite the sticky file.
        !            30: If the file is being executed by any process,
        !            31: writing will be prevented; it suffices to simply remove the file
        !            32: and then rewrite it, being careful to reset the owner and mode with
        !            33: .I chmod
        !            34: and
        !            35: .IR chown (2).
        !            36: (4) Set the sticky bit again.
        !            37: .PP
        !            38: Only the super-user can set the sticky bit.
        !            39: .SH BUGS
        !            40: Are self-evident.
        !            41: .PP
        !            42: Is largely unnecessary on the VAX; matters only for large programs that
        !            43: will page heavily to start, since text pages are normally cached incore
        !            44: as long as possible after all instances of a text image exit.

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