2 * SPDX-License-Identifier: BSD-3-Clause
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32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #if defined(LIBC_SCCS) && !defined(lint)
37 static char sccsid[] = "@(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93";
39 #endif /* LIBC_SCCS and not lint */
41 #include <sys/param.h>
43 #include <sys/resource.h>
50 #include "kvm_private.h"
52 static struct nlist nl[] = {
53 { .n_name = "_averunnable" },
54 #define X_AVERUNNABLE 0
55 { .n_name = "_fscale" },
61 * kvm_getloadavg() -- Get system load averages, from live or dead kernels.
63 * Put `nelem' samples into `loadavg' array.
64 * Return number of samples retrieved, or -1 on error.
67 kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem)
69 struct loadavg loadinfo;
74 return (getloadavg(loadavg, nelem));
76 if (!kd->arch->ka_native(kd)) {
77 _kvm_err(kd, kd->program,
78 "cannot read loadavg from non-native core");
82 if (kvm_nlist(kd, nl) != 0) {
83 for (p = nl; p->n_type != 0; ++p);
84 _kvm_err(kd, kd->program,
85 "%s: no such symbol", p->n_name);
89 #define KREAD(kd, addr, obj) \
90 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
91 if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
92 _kvm_err(kd, kd->program, "can't read averunnable");
97 * Old kernels have fscale separately; if not found assume
100 if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale))
101 loadinfo.fscale = fscale;
103 nelem = MIN(nelem, (int)(sizeof(loadinfo.ldavg) / sizeof(fixpt_t)));
104 for (i = 0; i < nelem; i++)
105 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;