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33 * @(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93
34 * $FreeBSD: src/lib/libkvm/kvm_getloadavg.c,v 1.3 1999/12/27 07:14:57 peter Exp $
35 * $DragonFly: src/lib/libkvm/kvm_getloadavg.c,v 1.2 2003/06/17 04:26:49 dillon Exp $
38 #include <sys/param.h>
40 #include <sys/resource.h>
42 #include <sys/sysctl.h>
43 #include <vm/vm_param.h>
51 #include "kvm_private.h"
53 static struct nlist nl[] = {
55 #define X_AVERUNNABLE 0
62 * kvm_getloadavg() -- Get system load averages, from live or dead kernels.
64 * Put `nelem' samples into `loadavg' array.
65 * Return number of samples retrieved, or -1 on error.
68 kvm_getloadavg(kd, loadavg, nelem)
73 struct loadavg loadinfo;
78 return (getloadavg(loadavg, nelem));
80 if (kvm_nlist(kd, nl) != 0) {
81 for (p = nl; p->n_type != 0; ++p);
82 _kvm_err(kd, kd->program,
83 "%s: no such symbol", p->n_name);
87 #define KREAD(kd, addr, obj) \
88 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
89 if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
90 _kvm_err(kd, kd->program, "can't read averunnable");
95 * Old kernels have fscale separately; if not found assume
98 if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale))
99 loadinfo.fscale = fscale;
101 nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t));
102 for (i = 0; i < nelem; i++)
103 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;