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29 * @(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libkvm/kvm_getloadavg.c,v 1.3 1999/12/27 07:14:57 peter Exp $
31 * $DragonFly: src/lib/libkvm/kvm_getloadavg.c,v 1.4 2004/04/11 21:28:03 cpressey Exp $
34 #include <sys/param.h>
36 #include <sys/resource.h>
37 #include <sys/sysctl.h>
38 #include <vm/vm_param.h>
46 #include "kvm_private.h"
48 static struct nlist nl
[] = {
50 #define X_AVERUNNABLE 0
57 * kvm_getloadavg() -- Get system load averages, from live or dead kernels.
59 * Put `nelem' samples into `loadavg' array.
60 * Return number of samples retrieved, or -1 on error.
63 kvm_getloadavg(kvm_t
*kd
, double loadavg
[], int nelem
)
65 struct loadavg loadinfo
;
70 return (getloadavg(loadavg
, nelem
));
72 if (kvm_nlist(kd
, nl
) != 0) {
73 for (p
= nl
; p
->n_type
!= 0; ++p
);
74 _kvm_err(kd
, kd
->program
,
75 "%s: no such symbol", p
->n_name
);
79 #define KREAD(kd, addr, obj) \
80 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
81 if (KREAD(kd
, nl
[X_AVERUNNABLE
].n_value
, &loadinfo
)) {
82 _kvm_err(kd
, kd
->program
, "can't read averunnable");
87 * Old kernels have fscale separately; if not found assume
90 if (!KREAD(kd
, nl
[X_FSCALE
].n_value
, &fscale
))
91 loadinfo
.fscale
= fscale
;
93 nelem
= MIN(nelem
, sizeof(loadinfo
.ldavg
) / sizeof(fixpt_t
));
94 for (i
= 0; i
< nelem
; i
++)
95 loadavg
[i
] = (double) loadinfo
.ldavg
[i
] / loadinfo
.fscale
;