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- /*
- * Copyright (c) 2014 Willem Dijkstra
- * 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.
- *
- */
- /*
- * 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.
- *
- * 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 <errno.h>
- #include <stdlib.h>
- #include <limits.h>
- #include "error.h"
- #include "percentages.h"
- #include "symon.h"
- #include "sylimits.h"
- #include "xmalloc.h"
- /* Globals for this module all start with cp_ */
- #ifdef HAS_CP_TIMES
- static char cp_time_mib_str[] = "kern.cp_times";
- #else
- static char cp_time_mib_str[] = "kern.cp_time";
- #endif
- static int cp_time_mib[CTL_MAXNAME];
- static size_t cp_time_len = 0;
- static void *cp_buf;
- static size_t cp_size = 0;
- void
- init_cpu(struct stream *st)
- {
- char buf[SYMON_MAX_OBJSIZE];
- const char *errstr;
- if (cp_time_len == 0) {
- 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;
- }
- if ((sysctl(cp_time_mib, cp_time_len, NULL, &cp_size, NULL, 0) != -1) &&
- (errno == ENOMEM))
- fatal("cpu(%.200s): failed to determine sysctl buffer len", st->arg);
- if (cp_size > SYMON_MAX_OBJSIZE)
- fatal("cpu(%.200s): sysctl buffer too large", st->arg);
- cp_buf = xmalloc(cp_size);
- gets_cpu();
- }
- st->parg.cp.id = strtonum(st->arg, 0, SYMON_MAXCPUID, &errstr);
- if (errstr != NULL)
- fatal("cpu(%.200s) is invalid: %.200s", st->arg, errstr);
- get_cpu(buf, sizeof(buf), st);
- info("started module cpu(%.200s)", st->arg);
- }
- void
- gets_cpu()
- {
- if (sysctl(cp_time_mib, cp_time_len, cp_buf, &cp_size, NULL, 0) < 0) {
- warning("%s:%d: sysctl failed", __FILE__, __LINE__);
- return;
- }
- }
- int
- get_cpu(char *symon_buf, int maxlen, struct stream *st)
- {
- int i;
- long *time1;
- if (!cp_time_len)
- return 0;
- time1 = (long *)(cp_buf + (sizeof(long) * CPUSTATES * st->parg.cp.id));
- if (((void *)time1 - cp_buf) > cp_size)
- warning("cpu(%d): not in sysctl buffer", st->parg.cp.id);
- /* convert cp_time counts to percentages */
- for (i = 0; i < CPUSTATES; i++)
- st->parg.cp.time2[i] = (int64_t) time1[i];
- (void)percentages(CPUSTATES, st->parg.cp.states, st->parg.cp.time2, 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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