/* 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/error.h>

#include <glibtop/swap.h>

#include <glibtop_suid.h>

static const unsigned long _glibtop_sysdeps_swap =

(1L << GLIBTOP_SWAP_TOTAL) + (1L << GLIBTOP_SWAP_USED) +

(1L << GLIBTOP_SWAP_FREE);

static const unsigned long _glibtop_sysdeps_swap_paging =

(1L << GLIBTOP_SWAP_PAGEIN) + (1L << GLIBTOP_SWAP_PAGEOUT);

static int pagesize;

/* Init function. */

void

_glibtop_init_swap_p (glibtop *server)

{

	pagesize = getpagesize ();

	server->sysdeps.swap = _glibtop_sysdeps_swap |

		_glibtop_sysdeps_swap_paging;

}

/* Provides information about swap usage. */

void

glibtop_get_swap_p (glibtop *server, glibtop_swap *buf)

{

	size_t len;

	unsigned int swappgsout, swappgsin;

	int nswdev;

	struct kvm_swap kvmsw[16];

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

	memset (kvmsw, 0, sizeof (kvmsw));

	nswdev = kvm_getswapinfo (server->machine->kd, kvmsw, 16, 0);

	if (nswdev < 1) return;

	buf->flags = _glibtop_sysdeps_swap;

	/* See the man page for kvm_getswapinfo(3) to see why we can do this. */

	buf->used = kvmsw[nswdev].ksw_used;

	buf->total = kvmsw[nswdev].ksw_total;

	buf->total *= pagesize;

	buf->used *= pagesize;

	buf->free = buf->total - buf->used;

	len = sizeof (swappgsout);

	if (sysctlbyname ("vm.stats.vm.v_swappgsout", &swappgsout, &len, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl (vm.stats.vm.v_swappgsout)");

		return;

	}

	len = sizeof (swappgsin);

	if (sysctlbyname ("vm.stats.vm.v_swappgsin", &swappgsin, &len, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl (vm.stats.vm.v_swappgsin)");

		return;

	}

	buf->pagein  = (guint64) swappgsin;

	buf->pageout = (guint64) swappgsout;

	buf->flags |= _glibtop_sysdeps_swap_paging;

}