loadavg.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 74 行

/* $Id: loadavg.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 <config.h>
#include <glibtop/error.h>
#include <glibtop/loadavg.h>

static const unsigned long _glibtop_sysdeps_loadavg =
(1L << GLIBTOP_LOADAVG_LOADAVG);

/* Init function. */

void
glibtop_init_loadavg_s (glibtop *server)
{
	server->sysdeps.loadavg = _glibtop_sysdeps_loadavg;
}

/* Provides load averange. */

void
glibtop_get_loadavg_s (glibtop *server, glibtop_loadavg *buf)
{
	struct tbl_loadavg loadavg;
	int ret;

	glibtop_init_s (&server, GLIBTOP_SYSDEPS_LOADAVG, 0);

	memset (buf, 0, sizeof (glibtop_loadavg));
	
	ret = table (TBL_LOADAVG, 0, (char *) &loadavg, 1,
		     sizeof (struct tbl_loadavg)); 

	if (ret != 1) return;

	buf->flags = _glibtop_sysdeps_loadavg;
		
	if (loadavg.tl_lscale == 0) {
		buf->loadavg [0] = loadavg.tl_avenrun.d [0];
		buf->loadavg [1] = loadavg.tl_avenrun.d [1];
		buf->loadavg [2] = loadavg.tl_avenrun.d [2];
	} else {
		buf->loadavg [0] = 
			(double) loadavg.tl_avenrun.l [0] /
			(double) loadavg.tl_mach_factor [0];
		buf->loadavg [1] =
			(double) loadavg.tl_avenrun.l [1] 
			/ (double) loadavg.tl_mach_factor [1];
		buf->loadavg [2] =
			(double) loadavg.tl_avenrun.l [2] /
			(double) loadavg.tl_mach_factor [2];
	}
}