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/* $OpenBSD: timer.c,v 1.4 2015/01/16 00:05:13 deraadt Exp $ */
/*
* Copyright (c) 2008 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/sched.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include "snmpd.h"
#include "mib.h"
extern struct snmpd *env;
void timer_cpu(int, short, void *);
int percentages(int, int64_t *, int64_t *, int64_t *, int64_t *);
static int64_t **cp_time;
static int64_t **cp_old;
static int64_t **cp_diff;
struct event cpu_ev;
void
timer_cpu(int fd, short event, void *arg)
{
struct event *ev = (struct event *)arg;
struct timeval tv = { 60, 0 }; /* every 60 seconds */
int mib[3] = { CTL_KERN, KERN_CPTIME2, 0 }, n;
size_t len;
int64_t *cptime2;
len = CPUSTATES * sizeof(int64_t);
for (n = 0; n < env->sc_ncpu; n++) {
mib[2] = n;
cptime2 = env->sc_cpustates + (CPUSTATES * n);
if (sysctl(mib, 3, cp_time[n], &len, NULL, 0) == -1)
continue;
(void)percentages(CPUSTATES, cptime2, cp_time[n],
cp_old[n], cp_diff[n]);
#ifdef DEBUG
log_debug("timer_cpu: cpu%d %d%% idle in %ds", n,
(cptime2[CP_IDLE] > 1000 ?
1000 : (cptime2[CP_IDLE] / 10)), tv.tv_sec);
#endif
}
evtimer_add(ev, &tv);
}
void
timer_init(void)
{
int mib[] = { CTL_HW, HW_NCPU }, i;
size_t len;
len = sizeof(env->sc_ncpu);
if (sysctl(mib, 2, &env->sc_ncpu, &len, NULL, 0) == -1)
fatal("sysctl");
env->sc_cpustates = calloc(env->sc_ncpu, CPUSTATES * sizeof(int64_t));
cp_time = calloc(env->sc_ncpu, sizeof(int64_t *));
cp_old = calloc(env->sc_ncpu, sizeof(int64_t *));
cp_diff = calloc(env->sc_ncpu, sizeof(int64_t *));
if (env->sc_cpustates == NULL ||
cp_time == NULL || cp_old == NULL || cp_diff == NULL)
fatal("calloc");
for (i = 0; i < env->sc_ncpu; i++) {
cp_time[i] = calloc(CPUSTATES, sizeof(int64_t));
cp_old[i] = calloc(CPUSTATES, sizeof(int64_t));
cp_diff[i] = calloc(CPUSTATES, sizeof(int64_t));
if (cp_time[i] == NULL || cp_old[i] == NULL ||
cp_diff[i] == NULL)
fatal("calloc");
}
evtimer_set(&cpu_ev, timer_cpu, &cpu_ev);
timer_cpu(0, EV_TIMEOUT, &cpu_ev);
}
/*
* percentages() function to calculate CPU utilization.
* Source code derived from the top(1) utility:
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
int
percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs)
{
int64_t change, total_change, *dp, half_total;
int i;
/* initialization */
total_change = 0;
dp = diffs;
/* calculate changes for each state and the overall change */
for (i = 0; i < cnt; i++) {
if ((change = *new - *old) < 0) {
/* this only happens when the counter wraps */
change = (*new - *old);
}
total_change += (*dp++ = change);
*old++ = *new++;
}
/* avoid divide by zero potential */
if (total_change == 0)
total_change = 1;
/* calculate percentages based on overall change, rounding up */
half_total = total_change / 2l;
for (i = 0; i < cnt; i++)
*out++ = ((*diffs++ * 1000 + half_total) / total_change);
/* return the total in case the caller wants to use it */
return (total_change);
}
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