lload for xenix

[Clemens Schrimpe]

Ha! Thanks to SCO's freaky developers, the load-average stuff is already
included in SCO 2.3.1!

You'll find the label '_avenrun' in /xenix, which is somewhat declared as
unsigned short avenrun[3].
As far, as I have found out (try looking into the 'w' command), they
use a strange floating-point notation for each value. The integer part
is in the higher 8 bits, while the fractional part is in the lower 8 bits.
(That's how 'w' will diplay 'em)

Anyhow - this is how one of our utilities gets the load average:
(simple collection of various subroutines)

	#include <sys/a.out.h>
	#include <fcntl.h>

	print_average ()
	{
	int	fd;
	struct nlist nl;
	unsigned short loadav[3];

	    if ((fd = open ("/dev/kmem", O_RDONLY)) == -1)
		return;
	    strcpy(nl.n_name, "_avenrun");
	    nlist ("/xenix", &nl);
	    if (nl.n_type == 0 || nl.n_value == 0)
		return;
	    if (lseek (fd, nl.n_value, 0) == -1)
		return;
	    if (read (fd, loadav, sizeof (loadav)) != sizeof (loadav))
		return 0;
	    printf (" %2.2f %2.2f %2.2f\n", (double)loadav[0]/256.,
		(double)loadav[1]/256., (double)loadav[2]/256.);
	}

Any corrections from SCO welcome - but guys: better correct your 'w' too 
then :-)

greeting the whole SCO community on the net,

	Clemens Schrimpe, netCS GmbH Informationstechnik Berlin

PS:
By looking more deeply into the kernel's tables you'll also find a fully
working select() and other fancy stuff in Xenix 2.3.1! (thnx 2 sco)
(even though the PTY's have a minor bug, which will prevent the select()
 from working with them - but this is a fast fix ...)
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