/* Copyright (C) 1998-99 Martin Baulig

   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <martin@home-of-linux.org>, April 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/cpu.h>

#include <glibtop_suid.h>

static const unsigned long _glibtop_sysdeps_cpu =

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

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

(1 << GLIBTOP_CPU_IDLE) + (1 << GLIBTOP_CPU_FREQUENCY);

/* Provides information about cpu usage. */

void

glibtop_get_cpu_p (glibtop *server, glibtop_cpu *buf)

{

	long cp_time [CPUSTATES], mp_time [NCPU][CPUSTATES];

	int i;

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

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

	/* !!! THE FOLLOWING CODE RUNS SGID KMEM - CHANGE WITH CAUTION !!! */

	glibtop_suid_enter (server);

	/* get the cp_time array */

	(void) _glibtop_getkval (server, _glibtop_nlist [X_CP_TIME].n_value,

				 (int *) cp_time, sizeof (cp_time),

				 _glibtop_nlist [X_CP_TIME].n_name);

#ifdef MULTIPROCESSOR

	/* get the mp_time array as well */

	if (server->machine->ncpu > 1) {

		(void) _glibtop_getkval (server, _glibtop_nlist [X_MP_TIME].n_value,

					 (int *) mp_time, sizeof (mp_time),

					 _glibtop_nlist [X_MP_TIME].n_name);

	}

#endif

	glibtop_suid_leave (server);

	/* !!! END OF SUID ROOT PART !!! */

#ifdef MULTIPROCESSOR

	/* If we have multiple processors, we add the times for each of them

	 * and set frequency to 100 times the number of the processors. */

	/* [FIXME]: I had no machine with more than one processor to test

	 *          this code !!! */

	if (server->machine->ncpu > 1) {

		for (i = 0; i < server->machine->ncpu; i++) {

			buf->user += mp_time [i][CP_USER];

			buf->nice += mp_time [i][CP_NICE];

			buf->sys  += mp_time [i][CP_SYS];

			buf->idle += mp_time [i][CP_IDLE];

			buf->frequency += 100;

		}

	} else {

		buf->user = cp_time [CP_USER];

		buf->nice = cp_time [CP_NICE];

		buf->sys  = cp_time [CP_SYS];

		buf->idle = cp_time [CP_IDLE];

		buf->frequency = 100;

	}

#else

	buf->user = cp_time [CP_USER];

	buf->nice = cp_time [CP_NICE];

	buf->sys  = cp_time [CP_SYS];

	buf->idle = cp_time [CP_IDLE];

	buf->frequency = 100;

#endif

	/* Calculate total time. */

	buf->total = buf->user + buf->nice + buf->sys + buf->idle;

	/* Now we can set the flags. */

	buf->flags = _glibtop_sysdeps_cpu;

}