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- /* $Id: sm_cpu.c,v 1.5 2007/02/11 20:07:32 dijkstra Exp $ */
- /* The author of this code is Matthew Gream.
- *
- * The percentages function was written by William LeFebvre and is part
- * of the 'top' utility. His copyright statement is below.
- *
- * Copyright (c) 2004 Matthew Gream
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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
- * COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
- *
- */
- /*
- * Top users/processes display for Unix
- * Version 3
- *
- * This program may be freely redistributed,
- * but this entire comment MUST remain intact.
- *
- * Copyright (c) 1984, 1989, William LeFebvre, Rice University
- * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
- */
- /*
- * Get current cpu statistics in percentages (total of all counts = 100.0)
- * and returns them in symon_buf as
- *
- * user : nice : system : interrupt : idle
- *
- * This code is not re-entrant and UP only.
- *
- * This module uses the sysctl interface and can run as any user.
- */
- #include "conf.h"
- #include <sys/param.h>
- #include <sys/dkstat.h>
- #include <sys/sysctl.h>
- #include "error.h"
- #include "symon.h"
- __BEGIN_DECLS
- int percentages(int, int *, long *, long *, long *);
- __END_DECLS
- /* Globals for this module all start with cp_ */
- static char cp_time_mib_str[] = "kern.cp_time";
- static int cp_time_mib[CTL_MAXNAME];
- static size_t cp_time_len = 0;
- static size_t cp_size;
- /*
- * percentages(cnt, out, new, old, diffs) - calculate percentage change
- * between array "old" and "new", putting the percentages i "out".
- * "cnt" is size of each array and "diffs" is used for scratch space.
- * The array "old" is updated on each call.
- * The routine assumes modulo arithmetic. This function is especially
- * useful on BSD mchines for calculating cpu state percentages.
- */
- int
- percentages(int cnt, int *out, register long *new, register long *old, long *diffs)
- {
- register int i;
- register long change;
- register long total_change;
- register long *dp;
- long half_total;
- /* initialization */
- total_change = 0;
- dp = diffs;
- /* calculate changes for each state and the overall change */
- for (i = 0; i < cnt; i++) {
- if (*new < *old)
- change = (ULONG_MAX - *old) + *new;
- else
- 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 / 2;
- 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;
- }
- void
- init_cpu(struct stream *st)
- {
- char buf[SYMON_MAX_OBJSIZE];
- cp_time_len = CTL_MAXNAME;
- if (sysctlnametomib(cp_time_mib_str, cp_time_mib, &cp_time_len) < 0) {
- warning("sysctlnametomib for cpu failed");
- cp_time_len = 0;
- }
- cp_size = sizeof(st->parg.cp.time);
- get_cpu(buf, sizeof(buf), st);
- info("started module cpu(%.200s)", st->arg);
- }
- void
- gets_cpu()
- {
- /* EMPTY */
- }
- int
- get_cpu(char *symon_buf, int maxlen, struct stream *st)
- {
- if (!cp_time_len) {
- return 0;
- }
- if (sysctl(cp_time_mib, cp_time_len, &st->parg.cp.time, &cp_size, NULL, 0) < 0) {
- warning("%s:%d: sysctl kern.cp_time failed", __FILE__, __LINE__);
- return 0;
- }
- /* convert cp_time counts to percentages */
- (void)percentages(CPUSTATES, st->parg.cp.states, st->parg.cp.time, st->parg.cp.old, st->parg.cp.diff);
- return snpack(symon_buf, maxlen, st->arg, MT_CPU,
- (double) (st->parg.cp.states[CP_USER] / 10.0),
- (double) (st->parg.cp.states[CP_NICE] / 10.0),
- (double) (st->parg.cp.states[CP_SYS] / 10.0),
- (double) (st->parg.cp.states[CP_INTR] / 10.0),
- (double) (st->parg.cp.states[CP_IDLE] / 10.0));
- }
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