c4a7cdb3b6
and is module aware. Yes, this means that kvm_nlist(3) will find symbols in loaded modules. The emulation of the nlist struct is pretty crude but seems to work well enough for all the users in the tree that I found.
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93";
|
|
#else
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/sysctl.h>
|
|
#include <vm/vm_param.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <nlist.h>
|
|
#include <kvm.h>
|
|
|
|
#include "kvm_private.h"
|
|
|
|
static struct nlist nl[] = {
|
|
{ "_averunnable" },
|
|
#define X_AVERUNNABLE 0
|
|
{ "_fscale" },
|
|
#define X_FSCALE 1
|
|
{ "" },
|
|
};
|
|
|
|
/*
|
|
* kvm_getloadavg() -- Get system load averages, from live or dead kernels.
|
|
*
|
|
* Put `nelem' samples into `loadavg' array.
|
|
* Return number of samples retrieved, or -1 on error.
|
|
*/
|
|
int
|
|
kvm_getloadavg(kd, loadavg, nelem)
|
|
kvm_t *kd;
|
|
double loadavg[];
|
|
int nelem;
|
|
{
|
|
struct loadavg loadinfo;
|
|
struct nlist *p;
|
|
int fscale, i;
|
|
|
|
if (ISALIVE(kd))
|
|
return (getloadavg(loadavg, nelem));
|
|
|
|
if (kvm_nlist(kd, nl) != 0) {
|
|
for (p = nl; p->n_type != 0; ++p);
|
|
_kvm_err(kd, kd->program,
|
|
"%s: no such symbol", p->n_name);
|
|
return (-1);
|
|
}
|
|
|
|
#define KREAD(kd, addr, obj) \
|
|
(kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
|
|
if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
|
|
_kvm_err(kd, kd->program, "can't read averunnable");
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Old kernels have fscale separately; if not found assume
|
|
* running new format.
|
|
*/
|
|
if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale))
|
|
loadinfo.fscale = fscale;
|
|
|
|
nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
|
|
for (i = 0; i < nelem; i++)
|
|
loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
|
|
return (nelem);
|
|
}
|