Getting CPU, Memory, etc

I ran "truss uname -a" to watch what system calls it was making to determine the output of uname.  Turns out it calls sysinfo(2) several times.  The manpage is here:

    http://ist-socrates.berkeley.edu/cgi-bin/man.cgi?section=2&topic=sysinfo

And here's a code snippet I found elsewhere:

#include     <sys/systeminfo.h>
#include     <errno.h>
#include     <stdio.h>

#define     BUFF_SIZE     8192
main ()
{
     char     lBuff [BUFF_SIZE];

        long    lResult;
        errno   = 0;
        lResult = sysinfo (SI_ARCHITECTURE, lBuff, BUFF_SIZE);
        if (lResult != -1)
                 (void) printf ("sysinfo (SI_ARCHITECTURE)       = %s\\n", lBuff);
        else
                 (void) printf ("sysinfo (SI_ARCHITECTURE)       = -1, errno = %d\\n", lResult, errno);
}


There's also sysconf(3C):  http://www.bsn.com:8080/cgi-bin/htmlman?sysconf(3C)

This is not exactly I want.
I wanna get the CPU and Memory load values, ie, which CPU and Memory percentage are been used for my machine.

Here is a link to the perfmeter source code. Maybe it can give you some hints.

"http://wuarchive.wustl.edu/graphics/graphics/packages/misc/?M=A"

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