85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
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/*
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* cpu_freebsd.c - module to get cpu usage, for FreeBSD
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*
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* Copyright (c) 2001, 2002 Seiichi SATO <ssato@sh.rim.or.jp>
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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 <kvm.h>
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#include <fcntl.h>
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#include <sys/dkstat.h>
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static kvm_t *kd = NULL;
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static struct nlist nlst[] = { {"_cp_time"}, {0} };
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void
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cpu_init(void)
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{
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kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open");
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if (kd == NULL) {
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fprintf(stderr, "can't open kernel virtual memory");
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exit(1);
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}
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kvm_nlist(kd, nlst);
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if (nlst[0].n_type == 0) {
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fprintf(stderr, "error extracting symbols");
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exit(1);
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}
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/* drop setgid & setuid (the latter should not be there really) */
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seteuid(getuid());
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setegid(getgid());
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if (geteuid() != getuid() || getegid() != getgid()) {
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fprintf(stderr, "unable to drop privileges");
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exit(1);
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}
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}
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/* returns 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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static int pre_used, pre_total;
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int used, total, result;
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unsigned long int cpu_time[CPUSTATES];
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if (kvm_read(kd, nlst[0].n_value, &cpu_time, sizeof(cpu_time)) !=
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sizeof(cpu_time))
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return 0;
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used = cpu_time[CP_USER] + cpu_time[CP_SYS];
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if (!opts->ignore_nice)
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used += cpu_time[CP_NICE];
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total = used + cpu_time[CP_IDLE];
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if (pre_total == 0) {
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result = 0;
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} else if ((total - pre_total) > 0) {
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result = (100 * (double) (used - pre_used)) / (double) (total -
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pre_total);
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} else {
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result = 0;
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}
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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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