10-18-2011
I did not get what you wanted. Yes, just modify the MIB code - if it is custom.
Embed the tail - nawk one-liner into a C system() call. Why? you want to synchronize fresh data with the SNMP call.
I am assuming this is an important datum in monitoring and that you are going to change the MIB C.
Or, write the nawk output to a known place that the snmp process can read. Modify the C code to open and read the file. If this does not violate SNMP security policy. Known places are publicly accessible directories like /var/tmp, and /tmp. Be sure the permissions on the file coming out of tail -nawk allows world (other) read, and the directories in the path up to the place where the file lives are world execute.
Is this what you are asking?
BTW - for stuff like this we run an ssh connection to a special snmp-like user on the box in question, and then execute a script. A lot of the console monitoring apps support other protocols than SNMP, among them ftp and ssh. The custom MIB world is not worth it for something like this.
However - Lithium was totally MAC oriented when I saw it demoed. Dunno if the lithium -> lithium core bridge supports anything else like ssh.
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LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)
NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS
--predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO
bup-midx(1), bup-save(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-margin(1)