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Path: utzoo!watmath!clyde!bonnie!akgua!mcnc!decvax!genrad!mit-eddie!think!harvard!seismo!mcvax!unido!ab
From: ab@unido.UUCP
Newsgroups: net.unix
Subject: what is going on here ???
Message-ID: <nf11400002@unido.UUCP>
Date: Thu, 30-May-85 13:30:00 EDT
Article-I.D.: unido.nf11400002
Posted: Thu May 30 13:30:00 1985
Date-Received: Mon, 24-Jun-85 04:27:20 EDT
Sender: notes@unido.UUCP
Lines: 43
Nf-ID: #N:unido:11400002:000:947
Nf-From: unido!ab    May 30 15:30:00 1985

If you are running 4.2, look at the following short program and
guess what it will do. Then compile and run it and find out
what it really does. 

Try to explain its behavior!! (- Is it a bug in 4.2 ??? :-) )

	Andreas

--
Andreas Bormann                 ab@unido.UUCP
University of Dortmund          N 51 29' 05"   E 07 24' 42"
West Germany

--- CUT HERE ---------- CUT HERE ---------- CUT HERE ---------- CUT HERE ----
#include <nlist.h>

#define NAMELIST "/vmunix"

struct nlist    avenrun[] = {
      { "_avenrun" },
      { "" }
};

main()
{
	register int    kmem;
	double  avg[3];

	if((kmem = open ("/dev/kmem", 0) < 0)) {
		printf("Cannot open kmem\n");
		exit(1);
	}
	nlist(NAMELIST, avenrun);
	if(avenrun[0].n_type == 0) {
		printf("Cannot find avenrun\n");
		exit(1);
	}
	lseek(kmem, (long) avenrun[0].n_value, 0);
	read(kmem, (char *) avg, 3 * sizeof (double));
	printf("Load average: %f %f %f\n", avg[0], avg[1], avg[2]);
	exit(0);
}