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Annotation of researchv10dc/man/manb/sticky.8, revision 1.1.1.1

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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