/* Copyright (C) 1998-99 Martin Baulig

   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <martin@home-of-linux.org>, March 1999.

   LibGTop is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License,

   or (at your option) any later version.

   LibGTop is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

   for more details.

   You should have received a copy of the GNU General Public License

   along with LibGTop; see the file COPYING. If not, write to the

   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

   Boston, MA 02110-1301, USA.

*/

#include <config.h>

#include <glibtop.h>

#include <glibtop/loadavg.h>

#ifdef HAVE_GETLOADAVG

#include <sys/loadavg.h>

#else

#include <assert.h>

#include <sys/param.h>

#include <kstat.h>

#endif

static const unsigned long _glibtop_sysdeps_loadavg =

(1L << GLIBTOP_LOADAVG_LOADAVG);

/* Init function. */

void

_glibtop_init_loadavg_s (glibtop *server)

{

	server->sysdeps.loadavg = _glibtop_sysdeps_loadavg;

}

/* Provides load average. */

void

glibtop_get_loadavg_s (glibtop *server, glibtop_loadavg *buf)

{

#ifndef HAVE_GETLOADAVG

	kstat_ctl_t *kc;

	kstat_t *ksp;

	size_t i;

	static const char avestrings[][14] = { "avenrun_1min",

					       "avenrun_5min",

					       "avenrun_15min" };

#endif

	memset (buf, 0, sizeof (glibtop_loadavg));

#ifdef HAVE_GETLOADAVG

	if (getloadavg (buf->loadavg, 3) != 3)

		return;

#else

	if(!(kc = server->machine->kc))

	    return;

	switch(kstat_chain_update(kc))

	{

	    case -1: assert(0); /* Debugging, shouldn't happen */

	    case 0:  break;

	    default: glibtop_get_kstats(server);

	}

	if(!(ksp = server->machine->system))

	    return;

	if(kstat_read(kc, ksp, NULL) < 0)

	    return;

	for(i = 0; i < 3; ++i) /* Do we have a countof macro? */

	{

		kstat_named_t *kn;

		kn = (kstat_named_t *)kstat_data_lookup(ksp, avestrings[i]);

		if(kn)

		    buf->loadavg[i] = (double)kn->value.ul / FSCALE;

	}

#endif /* HAVE_GETLOADAVG */

	buf->flags = _glibtop_sysdeps_loadavg;

}