90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
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* Copyright (c) 2018, Babak Farrokhi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <devstat.h>
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#include <err.h>
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#include <kvm.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <strings.h>
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#include <unistd.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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static struct statinfo cur, last;
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kvm_t *kd = NULL;
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static int readvar(kvm_t *kd, const char *name, int nlid, void *ptr,
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size_t len) {
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size_t nlen = len;
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if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
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warn("sysctl(%s...) failed", name);
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return (1);
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}
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if (nlen != len) {
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warnx("sysctl(%s...): expected %lu, got %lu", name, (unsigned long)len,
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(unsigned long)nlen);
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return (1);
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}
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return (0);
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}
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static void cpustats(bool print) {
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int state;
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long tmp;
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double cptime = 0.0;
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char *names[] = {"user", "nice", "system", "interrupt", "idle"};
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readvar(kd, "kern.cp_time", 0, &cur.cp_time, sizeof(cur.cp_time));
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for (state = 0; state < CPUSTATES; state++) {
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tmp = cur.cp_time[state];
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cur.cp_time[state] -= last.cp_time[state];
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last.cp_time[state] = tmp;
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}
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for (state = 0; state < CPUSTATES; ++state)
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cptime += cur.cp_time[state];
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if (print) {
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for (state = 0; state < CPUSTATES; ++state)
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printf("%s.value %.0f\n", names[state],
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rint(100. * cur.cp_time[state] / (cptime ? cptime : 1)));
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}
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}
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int main(void)
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{
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bzero(cur.cp_time, sizeof(cur.cp_time));
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bzero(last.cp_time, sizeof(last.cp_time));
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cpustats(false);
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sleep(1);
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cpustats(true);
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}
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