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Re: getloadavg not universally available

From: Phil D'Amore
Subject: Re: getloadavg not universally available
Date: Wed, 19 Feb 2003 08:54:00 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20021003

If anyone is interested, I had to write the attached for something a while back. It emulates the Linux/Solaris interface to getloadavg() on a AIX box. I have tested this against various 4.x incarnations of AIX but it has never been tested against 5.x. Actually I'm not too fluent in AIX 5 but I'd be surprised if it does not contain this function already.


Phil D'Amore                             "Y'know, there was a time when
Senior System Administrator               corporate responsibility meant
Red Hat, Inc                              having the decency to jump out of
Office: 919.754.3700 x44395               a window when you got caught"
Cell:   919.641.3669                         -- Non-Sequitur, 09/30/2002

#include <stdio.h>
#include <nlist.h>
#include <errno.h>
#include <fcntl.h>

#define LOADAVG_1MIN 0
#define LOADAVG_5MIN 1
#define LOADAVG_15MIN 2

    double loadavg[3];
    getloadavg(loadavg, 3);
    printf("Load average: %.2f, %.2f, %.2f\n", loadavg[0], loadavg[1],

getloadavg(double loadavg[], int nelem)
    struct nlist nl;
    int kmem, i;
    long avenrun[3];

    nl.n_name = "avenrun";
    nl.n_value = 0;

    if(knlist(&nl, 1, sizeof(nl)))
        return -1;

    if((kmem = open("/dev/kmem", 0, 0)) <= 0)
        return -1;

    if(pread(kmem, avenrun, sizeof(avenrun), nl.n_value) < sizeof(avenrun))
        return -1;

        loadavg[i] = (double) avenrun[i] / 65535;
    return i;

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