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Full Discussion: Send statistical data via SNMP
Special Forums UNIX and Linux Applications Infrastructure Monitoring Send statistical data via SNMP Post 302565606 by jim mcnamara on Tuesday 18th of October 2011 10:39:05 AM
Old 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 MINIX

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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