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Annotation of src/lib/libkvm/kvm_getloadavg.c, Revision 1.11

1.11    ! matt        1: /*     $NetBSD: kvm_getloadavg.c,v 1.10 2010/09/26 22:28:05 jym Exp $  */
1.2       thorpej     2:
1.1       cgd         3: /*-
                      4:  * Copyright (c) 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
1.8       agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
1.4       mikel      32: #include <sys/cdefs.h>
1.1       cgd        33: #if defined(LIBC_SCCS) && !defined(lint)
1.2       thorpej    34: #if 0
1.1       cgd        35: static char sccsid[] = "@(#)kvm_getloadavg.c   8.1 (Berkeley) 6/4/93";
1.2       thorpej    36: #else
1.11    ! matt       37: __RCSID("$NetBSD: kvm_getloadavg.c,v 1.10 2010/09/26 22:28:05 jym Exp $");
1.2       thorpej    38: #endif
1.1       cgd        39: #endif /* LIBC_SCCS and not lint */
                     40:
                     41: #include <sys/param.h>
                     42: #include <sys/time.h>
                     43: #include <sys/resource.h>
1.7       thorpej    44: #include <sys/lwp.h>
1.1       cgd        45: #include <sys/proc.h>
                     46: #include <sys/sysctl.h>
1.6       mrg        47: #include <uvm/uvm_param.h>
1.1       cgd        48:
                     49: #include <db.h>
                     50: #include <fcntl.h>
                     51: #include <limits.h>
                     52: #include <nlist.h>
                     53: #include <kvm.h>
1.3       mikel      54: #include <stdlib.h>
1.1       cgd        55:
                     56: #include "kvm_private.h"
                     57:
                     58: static struct nlist nl[] = {
1.11    ! matt       59:        { .n_name = "_averunnable" },
1.1       cgd        60: #define        X_AVERUNNABLE   0
1.11    ! matt       61:        { .n_name = "_fscale" },
1.1       cgd        62: #define        X_FSCALE        1
1.11    ! matt       63:        { .n_name = "" },
1.1       cgd        64: };
                     65:
                     66: /*
                     67:  * kvm_getloadavg() -- Get system load averages, from live or dead kernels.
                     68:  *
                     69:  * Put `nelem' samples into `loadavg' array.
                     70:  * Return number of samples retrieved, or -1 on error.
                     71:  */
                     72: int
1.9       jym        73: kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem)
1.1       cgd        74: {
                     75:        struct loadavg loadinfo;
                     76:        struct nlist *p;
                     77:        int fscale, i;
                     78:
                     79:        if (ISALIVE(kd))
                     80:                return (getloadavg(loadavg, nelem));
                     81:
                     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);
                     86:                return (-1);
                     87:        }
                     88:
                     89:        if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
                     90:                _kvm_err(kd, kd->program, "can't read averunnable");
                     91:                return (-1);
                     92:        }
                     93:
                     94:        /*
                     95:         * Old kernels have fscale separately; if not found assume
                     96:         * running new format.
                     97:         */
                     98:        if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale))
                     99:                loadinfo.fscale = fscale;
                    100:
                    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;
                    104:        return (nelem);
                    105: }

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