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105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/*
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* cpu_freebsd.c - get cpu usage
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*
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* Copyright (C) 2003 Alexey Dokuchaev <danfe@regency.nsu.ru>
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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., 59 Temple Street #330, Boston, MA 02111-1307, USA.
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*/
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#include <osreldate.h>
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#if __FreeBSD_version > 500100
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#include <sys/time.h>
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#include <sys/resource.h>
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#else
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#include <sys/dkstat.h>
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#endif
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#include <sys/types.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static kvm_t *kd;
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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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if (!(kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open")))
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{
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perror("kvm_open");
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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)
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{
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perror("kvm_nlist");
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exit(1);
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}
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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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{
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perror("sete?id");
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exit(1);
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}
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}
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long cpu_used;
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long oldused;
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long oldtotal;
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int history[17];
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void cpu_getusage()
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{
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long cpu, nice, system, idle, used, total;
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long 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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{
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perror("kvm_read");
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exit(1);
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}
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cpu = cpu_time[CP_USER];
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nice = cpu_time[CP_NICE];
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system = cpu_time[CP_SYS];
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idle = cpu_time[CP_IDLE];
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used = cpu + nice + system;
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total = used + idle;
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if ((total - oldtotal) != 0)
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cpu_used = (100 * (double)(used - oldused)) /
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(double)(total - oldtotal);
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else
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cpu_used = 0;
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oldused = used;
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oldtotal = total;
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memmove(history + 1, history, 16 * sizeof(int));
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history[0] = (double)cpu_used * 16 / 100;
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}
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