67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
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* cpu_netbsd - module to get cpu usage, for NetBSD
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*
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* This code is based on cpu_openbsd.c
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*
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* Copyright (c) 2001, 2002 Seiichi SATO <ssato@sh.rim.or.jp>
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* Copyright (c) 2002 Thomas Runge <coto@core.de>
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* Copyright (C) 2003 Nedko Arnaudov <nedko@users.sourceforge.net>
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*
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* Licensed under the GPL
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cpu.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/sched.h>
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void
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cpu_init(void)
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{
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/* You don't need initialization under NetBSD */
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return;
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}
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/* Returns the current CPU usage in percent */
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int
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cpu_get_usage(cpu_options *opts)
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{
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int total, used, result, idle;
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static int pre_total, pre_used, pre_idle;
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int mib[] = { CTL_KERN, KERN_CP_TIME };
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u_int64_t cpu_time[CPUSTATES];
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size_t size = sizeof(cpu_time);
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/* get cpu time via sysctl */
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if (sysctl(mib, 2, &cpu_time, &size, NULL, 0) < 0)
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return 0;
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/* calculate usage */
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total = cpu_time[CP_USER] + cpu_time[CP_SYS] + cpu_time[CP_INTR] +
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cpu_time[CP_NICE] + cpu_time[CP_IDLE];
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used = cpu_time[CP_USER] + cpu_time[CP_SYS] + cpu_time[CP_INTR] +
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(opts->ignore_nice ? 0 : cpu_time[CP_NICE]);
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if ((pre_total == 0) || !(total - pre_total > 0)) {
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result = 0;
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} else {
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result = 100 * (double)(used - pre_used) / (double)(total - pre_total);
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}
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/* save used/total for next calculation */
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pre_used = used;
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pre_total = total;
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return result;
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}
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