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This repository is part of the Triton Data Center project. See the contribution guidelines and general documentation at the main Triton project page.

A node.js binding to the illumos kstat interface. This allows one to read kernel statistics via the kstat framework. It is likely to work unmodified on Solaris too.


The kstat module exports a single class, Reader that has the following methods:

Reader():  Takes an optional object specifying the kstats to read.  This
           object may have the following members:

           class    =>  optional string denoting class of kstat(s) to read
           module   =>  optional string denoting module of kstat(s) to read
           name     =>  optional string denoting name of kstat(s) to read
           instance =>  optional integer denoting instance of kstat(s) to read

           Together, these members form a specification of kstats to read.

read():    Returns an array of kstats that match the specification with
           which the reader instance was constructed *and* an optional
           specification passed to this function.  Each element of the
           array is an object that contains the following members:

           class    =>  string denoting class of kstat
           module   =>  string denoting module of kstat
           name     =>  string denoting name of kstat
           instance =>  integer denoting instance of kstat
           snaptime =>  nanoseconds since boot of this snapshot
           data     =>  an object containing the named kstat data itself


Here is a simple program that dumps the kstats of class mib2:

var kstat = require('kstat');
var util = require('util');
var reader = new kstat.Reader({ 'class': 'mib2' } );

Here is a the same program that reads only the mib2 class kstats from the icmp module:

var kstat = require('kstat');
var util = require('util');
var reader = new kstat.Reader({ 'class': 'mib2', module: 'icmp' } );

Finally, here is a simple program that prints the number of ICMP datagrams received per second:

var kstat = require('kstat');
var reader = new kstat.Reader({ 'class': 'mib2', module: 'icmp' } );

var data = [];
var gen = 0;

setInterval(function() {
	data[gen] =[0];
	gen ^= 1;

	if (!(data[0] && data[1]))

	console.log(data[gen ^ 1].data.inDatagrams - data[gen].data.inDatagrams);
}, 1000);

You can find further example programs in the examples directory.