115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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* gloadavg.c - get load average for Linux
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* Copyright (C) 1993 Thomas Koenig
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* Copyright 2000-2014 Thibault Godouet <fcron@free.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _POSIX_SOURCE /* Don't redefine if already exists */
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#define _POSIX_SOURCE 1
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#endif
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#include "fcron.h"
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/* Local headers */
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#include "getloadavg.h"
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/* Global functions */
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#ifdef HAVE_KSTAT
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#include <kstat.h>
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int
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getloadavg(double *result, int n)
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/* return the current load average as a floating point number,
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* the number of load averages read, or <0 for error
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*/
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{
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kstat_ctl_t *kc;
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kstat_t *ksp;
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kstat_named_t *knm;
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kstat_named_t knm_buf[20];
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int cnt;
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int ret;
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if (n != 3) {
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return -1;
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}
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ret = 0;
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kc = kstat_open();
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for (ksp = kc->kc_chain; ksp != NULL; ksp = ksp->ks_next) {
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if (strcmp(ksp->ks_name, "system_misc") == 0) {
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kstat_read(kc, ksp, &knm_buf);
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for (cnt = 0; cnt < ksp->ks_ndata; cnt++) {
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knm = &knm_buf[cnt];
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if (strcmp(knm->name, "avenrun_1min") == 0) {
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result[0] = knm->value.ui32 / 256.0;
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ret++;
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}
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else if (strcmp(knm->name, "avenrun_5min") == 0) {
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result[1] = knm->value.ui32 / 256.0;
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ret++;
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}
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else if (strcmp(knm->name, "avenrun_15min") == 0) {
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result[2] = knm->value.ui32 / 256.0;
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ret++;
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}
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}
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}
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}
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kstat_close(kc);
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return ret;
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}
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#else /* def HAVE_KSTAT */
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int
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getloadavg(double *result, int n)
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/* return the current load average as a floating point number,
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* the number of load averages read, or <0 for error
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*/
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{
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FILE *fp;
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int i;
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char loadavg_path = PROC "/loadavg";
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if (n > 3)
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n = 3;
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if ((fp = fopen(loadavg_path, "r")) == NULL) {
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error_e("could not open '%s' (make sure procfs is mounted)",
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loadavg_path);
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i = -1;
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}
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else {
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for (i = 0; i < n; i++) {
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if (fscanf(fp, "%lf", result) != 1)
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goto end;
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result++;
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}
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}
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end:
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xfclose_check(&fp, loadavg_path);
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return (i < 0) ? i : i;
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}
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#endif /* def HAVE_KSTAT */
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