/* 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/mem.h>

#include <glibtop_suid.h>

#include <sys/mount.h>

#include <sys/sysctl.h>

#include <uvm/uvm_extern.h>

static const unsigned long _glibtop_sysdeps_mem =

(1L << GLIBTOP_MEM_TOTAL)  + (1L << GLIBTOP_MEM_USED) +

(1L << GLIBTOP_MEM_FREE)   + (1L << GLIBTOP_MEM_SHARED) +

(1L << GLIBTOP_MEM_BUFFER) + (1L << GLIBTOP_MEM_CACHED) +

(1L << GLIBTOP_MEM_USER)   + (1L << GLIBTOP_MEM_LOCKED);

#ifndef LOG1024

#define LOG1024		10

#endif

/* these are for getting the memory statistics */

static int pageshift;		/* log base 2 of the pagesize */

/* define pagetok in terms of pageshift */

#define pagetok(size) ((size) << pageshift)

/* MIB array for sysctl */

static int uvmexp_mib  [] = { CTL_VM, VM_UVMEXP };

static int bcstats_mib [] = { CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT };

/* Init function. */

void

_glibtop_init_mem_s (glibtop *server)

{

	register int pagesize;

	/* get the page size and calculate pageshift from it */

	pagesize = sysconf(_SC_PAGESIZE);

	pageshift = 0;

	while (pagesize > 1) {

		pageshift++;

		pagesize >>= 1;

	}

	/* we only need the amount of log(2)1024 for our conversion */

	pageshift -= LOG1024;

	server->sysdeps.mem = _glibtop_sysdeps_mem;

}

void

glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)

{

	struct uvmexp uvmexp;

	struct bcachestats bcstats;

	size_t length;

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

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

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

		return;

	/* Get the data from sysctl */

	length = sizeof (uvmexp);

	if (sysctl (uvmexp_mib, 2, &uvmexp, &length, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl (vm.uvmexp)");

		bzero(&uvmexp, sizeof(length));

		return;

	}

	length = sizeof (bcstats);

	if (sysctl (bcstats_mib, 3, &bcstats, &length, NULL, 0)) {

		glibtop_warn_io_r (server, "sysctl (vfs.generic.bcstats)");

		bzero(&bcstats, sizeof(length));

		return;

	}

	/* convert memory stats to Kbytes */

	buf->total = (guint64) pagetok (uvmexp.npages) << LOG1024;

	buf->used  = (guint64) pagetok (uvmexp.npages - uvmexp.free) << LOG1024;

	buf->free  = (guint64) pagetok (uvmexp.free) << LOG1024;

	buf->locked = (guint64) pagetok (uvmexp.wired) << LOG1024;

	buf->shared = (guint64) pagetok (0 /* XXX */) << LOG1024;

	buf->cached = (guint64) pagetok (bcstats.numbufpages) << LOG1024;

	buf->buffer = 0;

	buf->user = buf->total - buf->free - buf->cached - buf->buffer;

	/* Set the values to return */

	buf->flags = _glibtop_sysdeps_mem;

}