usr.bin/systat/fetch.c

   1 /*      $NetBSD: fetch.c,v 1.12 2003/12/07 07:27:09 christos Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1980, 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)fetch.c     8.1 (Berkeley) 6/6/93";
  36 #endif
  37 __RCSID("$NetBSD: fetch.c,v 1.12 2003/12/07 07:27:09 christos Exp $");
  38 #endif /* not lint */
  39
  40 #include <sys/param.h>
  41 #include <sys/sched.h>
  42 #include <sys/sysctl.h>
  43
  44 #include <string.h>
  45 #include <errno.h>
  46
  47 #include "systat.h"
  48 #include "extern.h"
  49
  50 ssize_t
  51 kvm_ckread(const void *a, void *b, size_t l, const char *name)
  52 {
  53         if ((size_t)kvm_read(kd, (u_long)a, b, l) != l) {
  54                 if (verbose)
  55                         error("error reading kmem for %s at %p (%s)\n", name,
  56                             a, strerror(errno));
  57                 return (0);
  58         } else
  59                 return (1);
  60 }
  61
  62 int
  63 fetch_cptime(u_int64_t *cptime)
  64 {
  65         size_t ssize;
  66         int mib[2];
  67
  68         /*
  69          * XXX Need to locate the `correct' CPU when looking for this
  70          * XXX in crash dumps.  Just don't report it for now, in that
  71          * XXX case.
  72          */
  73         ssize = CPUSTATES * sizeof(u_int64_t);
  74         memset(cptime, 0, ssize);
  75         if (memf == NULL) {
  76                 mib[0] = CTL_KERN;
  77                 mib[1] = KERN_CP_TIME;
  78                 if (sysctl(mib, 2, cptime, &ssize, NULL, 0) < 0) {
  79                         if (verbose)
  80                                 error("error fetching cp_time\n");
  81                         return (0);
  82                 } else
  83                         return (1);
  84         }
  85         return (1);
  86 }