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/* $Id: cpu.c 2422 2005-12-12 09:38:15Z jamesh $ */
/* 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/cpu.h>
#include <glibtop_suid.h>
#ifdef __NetBSD__
#include <sys/sched.h>
#endif
static const unsigned long _glibtop_sysdeps_cpu =
(1L << GLIBTOP_CPU_TOTAL) + (1L << GLIBTOP_CPU_USER) +
(1L << GLIBTOP_CPU_NICE) + (1L << GLIBTOP_CPU_SYS) +
(1L << GLIBTOP_CPU_IDLE) + (1L << GLIBTOP_CPU_FREQUENCY) +
(1L << GLIBTOP_CPU_IOWAIT);
#ifndef KERN_CP_TIME
/* nlist structure for kernel access */
static struct nlist nlst [] = {
#ifdef __bsdi__
{ "_cpustats" },
#else
{ "_cp_time" },
#endif
{ 0 }
};
#endif
/* MIB array for sysctl */
static int mib_length=2;
static int mib [] = { CTL_KERN, KERN_CLOCKRATE };
#ifdef KERN_CP_TIME
static int mib2 [] = { CTL_KERN, KERN_CP_TIME };
#endif
/* Init function. */
void
glibtop_init_cpu_p (glibtop *server)
{
#ifndef KERN_CP_TIME
if (kvm_nlist (server->machine.kd, nlst) < 0) {
glibtop_warn_io_r (server, "kvm_nlist (cpu)");
return;
}
#endif
/* Set this only if kvm_nlist () succeeded. */
server->sysdeps.cpu = _glibtop_sysdeps_cpu;
}
/* Provides information about cpu usage. */
void
glibtop_get_cpu_p (glibtop *server, glibtop_cpu *buf)
{
#ifdef KERN_CP_TIME
guint64 cpts [CPUSTATES];
#else
long cpts [CPUSTATES];
#endif
/* sysctl vars*/
struct clockinfo ci;
size_t length;
glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_CPU), 0);
memset (buf, 0, sizeof (glibtop_cpu));
/* If this fails, the nlist may not be valid. */
if (server->sysdeps.cpu == 0)
return;
#ifdef KERN_CP_TIME
length = sizeof (cpts);
if (sysctl (mib2, mib_length, cpts, &length, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl");
return;
}
#else
if (kvm_read (server->machine.kd, nlst [0].n_value,
&cpts, sizeof (cpts)) != sizeof (cpts)) {
glibtop_warn_io_r (server, "kvm_read (cp_time)");
return;
}
#endif
/* Get the clockrate data */
length = sizeof (struct clockinfo);
if (sysctl (mib, mib_length, &ci, &length, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl");
return;
}
/* set user time */
buf->user = cpts [CP_USER];
/* set nice time */
buf->nice = cpts [CP_NICE];
/* set sys time */
buf->sys = cpts [CP_SYS];
/* set idle time */
buf->idle = cpts [CP_IDLE];
/* set iowait (really just interrupt) time */
buf->iowait = cpts [CP_INTR];
/* set frequency */
/*
FIXME -- is hz, tick, profhz or stathz wanted?
buf->frequency = sysctl("kern.clockrate", ...);
struct clockinfo
*/
buf->frequency = ci.hz;
/* set total */
buf->total = cpts [CP_USER] + cpts [CP_NICE]
+ cpts [CP_SYS] + cpts [CP_IDLE];
/* Set the flags last. */
buf->flags = _glibtop_sysdeps_cpu;
}
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