mem.c

来自「linux 操作系统下对系统资源监控程序的编写」· C语言 代码 · 共 70 行

/* $Id: mem.c,v 1.13 2003/10/19 16:55:43 carlos Exp $ */

/* Copyright (C) 1998-99 Martin Baulig
   This file is part of LibGTop 1.0.

   Contributed by Martin Baulig <[e-mail]>, 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/mem.h>

#include <sys/vm.h>

#include <mach.h>
#include <mach/mach_types.h>
#include <mach/vm_statistics.h>

static const unsigned long _glibtop_sysdeps_mem =
(1L << GLIBTOP_MEM_TOTAL) + (1L << GLIBTOP_MEM_USED) +
(1L << GLIBTOP_MEM_FREE);

/* Init function. */

void
glibtop_init_mem_s (glibtop *server)
{
	server->sysdeps.mem = _glibtop_sysdeps_mem;
}

/* Provides information about memory usage. */

void
glibtop_get_mem_s (glibtop *server, glibtop_mem *buf)
{
	vm_statistics_data_t vmstats;

	glibtop_init_s (&server, GLIBTOP_SYSDEPS_MEM, 0);

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

	buf->flags = _glibtop_sysdeps_mem;
	
	(void) vm_statistics(task_self(), &vmstats);

	buf->free = vmstats.free_count   * vmstats.pagesize;
	buf->used = vmstats.active_count * vmstats.pagesize;

	/* [FIXME]: Is this correct? */
	
	buf->total = (vmstats.active_count + vmstats.inactive_count +
		      vmstats.free_count + vmstats.wire_count) *
		vmstats.pagesize;
}