/* Copyright (C) 1998 Joshua Sled

   This file is part of LibGTop 1.0.

   Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.

   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/error.h>

#include <glibtop/cpu.h>

#include <glibtop_suid.h>

#ifdef __NetBSD__

#include <sys/sched.h>

#endif

static const unsigned long _glibtop_sysdeps_cpu =

(1L << GLIBTOP_CPU_TOTAL) + (1L << GLIBTOP_CPU_USER) +

(1L << GLIBTOP_CPU_NICE) + (1L << GLIBTOP_CPU_SYS) +

(1L << GLIBTOP_CPU_IDLE) + (1L << GLIBTOP_CPU_FREQUENCY) +

(1L << GLIBTOP_CPU_IOWAIT);

#ifndef KERN_CP_TIME

/* nlist structure for kernel access */

static struct nlist nlst [] = {

#ifdef __bsdi__

	{ "_cpustats" },

#else

	{ "_cp_time" },

#endif

	{ 0 }

};

#endif

/* MIB array for sysctl */

static int mib_length=2;

static int mib [] = { CTL_KERN, KERN_CLOCKRATE };

#ifdef KERN_CP_TIME

static int mib2 [] = { CTL_KERN, KERN_CP_TIME };

#endif

/* Init function. */

void

_glibtop_init_cpu_p (glibtop *server)

{

#ifndef KERN_CP_TIME

	if (kvm_nlist (server->machine->kd, nlst) < 0) {

		glibtop_warn_io_r (server, "kvm_nlist (cpu)");

		return;

	}

#endif

	/* Set this only if kvm_nlist () succeeded. */

	server->sysdeps.cpu = _glibtop_sysdeps_cpu;

}

/* Provides information about cpu usage. */

void

glibtop_get_cpu_p (glibtop *server, glibtop_cpu *buf)

{

#ifdef KERN_CP_TIME

	guint64 cpts [CPUSTATES];

#else

	long cpts [CPUSTATES];

#endif

	/* sysctl vars*/

	struct clockinfo ci;

	size_t length;

	glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_CPU), 0);

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

	/* If this fails, the nlist may not be valid. */

	if (server->sysdeps.cpu == 0)

		return;

#ifdef KERN_CP_TIME

	length = sizeof (cpts);

	if (sysctl (mib2, mib_length, cpts, &length, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl");

		return;

	}

#else

	if (kvm_read (server->machine->kd, nlst [0].n_value,

		      &cpts, sizeof (cpts)) != sizeof (cpts)) {

		glibtop_warn_io_r (server, "kvm_read (cp_time)");

		return;

	}

#endif

	/* Get the clockrate data */

	length = sizeof (struct clockinfo);

	if (sysctl (mib, mib_length, &ci, &length, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl");

		return;

	}

	/* set user time */

	buf->user = cpts [CP_USER];

	/* set nice time */

	buf->nice = cpts [CP_NICE];

	/* set sys time */

	buf->sys = cpts [CP_SYS];

	/* set idle time */

	buf->idle = cpts [CP_IDLE];

	/* set iowait (really just interrupt) time */

	buf->iowait = cpts [CP_INTR];

	/* set frequency */

	/*

	   FIXME --  is hz, tick, profhz or stathz wanted?

	   buf->frequency = sysctl("kern.clockrate", ...);

	   struct clockinfo

	*/

	buf->frequency = ci.hz;

	/* set total */

	buf->total = cpts [CP_USER] + cpts [CP_NICE]

		+ cpts [CP_SYS] + cpts [CP_IDLE];

	/* Set the flags last. */

	buf->flags = _glibtop_sysdeps_cpu;

}