bin/ps/nlist.c

   1 /*      $NetBSD: nlist.c,v 1.26 2008/04/28 20:22:51 martin Exp $        */
   2
   3 /*
   4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Simon Burge.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 1990, 1993, 1994
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 #include <sys/cdefs.h>
  62 #ifndef lint
  63 #if 0
  64 static char sccsid[] = "@(#)nlist.c     8.4 (Berkeley) 4/2/94";
  65 #else
  66 __RCSID("$NetBSD: nlist.c,v 1.26 2008/04/28 20:22:51 martin Exp $");
  67 #endif
  68 #endif /* not lint */
  69
  70 #include <sys/param.h>
  71 #include <sys/time.h>
  72 #include <sys/lwp.h>
  73 #include <sys/proc.h>
  74 #include <sys/resource.h>
  75 #include <sys/sysctl.h>
  76
  77 #include <err.h>
  78 #include <errno.h>
  79 #include <kvm.h>
  80 #include <math.h>
  81 #include <nlist.h>
  82 #include <stdio.h>
  83 #include <string.h>
  84 #include <unistd.h>
  85
  86 #include "ps.h"
  87
  88 struct  nlist psnl[] = {
  89         { .n_name = "_fscale" },
  90 #define X_FSCALE        0
  91         { .n_name = "_ccpu" },
  92 #define X_CCPU          1
  93         { .n_name = "_physmem" },
  94 #define X_PHYSMEM       2
  95         { .n_name = "_maxslp" },
  96 #define X_MAXSLP        3
  97         { .n_name = NULL }
  98 };
  99
 100 double  ccpu;                           /* kernel _ccpu variable */
 101 int     nlistread;                      /* if nlist already read. */
 102 int     mempages;                       /* number of pages of phys. memory */
 103 int     fscale;                         /* kernel _fscale variable */
 104 int     maxslp;                         /* kernel _maxslp variable */
 105 int     uspace;                         /* kernel USPACE value */
 106
 107 #define kread(x, v) \
 108         kvm_read(kd, psnl[x].n_value, (char *)&v, sizeof v) != sizeof(v)
 109
 110 int
 111 donlist(void)
 112 {
 113         int rval;
 114         fixpt_t xccpu;
 115
 116         rval = 0;
 117         nlistread = 1;
 118         if (kvm_nlist(kd, psnl)) {
 119                 nlisterr(psnl);
 120                 eval = 1;
 121                 return (1);
 122         }
 123         if (kread(X_FSCALE, fscale)) {
 124                 warnx("fscale: %s", kvm_geterr(kd));
 125                 eval = rval = 1;
 126         }
 127         if (kread(X_PHYSMEM, mempages)) {
 128                 warnx("avail_start: %s", kvm_geterr(kd));
 129                 eval = rval = 1;
 130         }
 131         if (kread(X_CCPU, xccpu)) {
 132                 warnx("ccpu: %s", kvm_geterr(kd));
 133                 eval = rval = 1;
 134         }
 135         if (kread(X_MAXSLP, maxslp)) {
 136                 warnx("maxslp: %s", kvm_geterr(kd));
 137                 eval = rval = 1;
 138         }
 139         ccpu = (double)xccpu / fscale;
 140         return (rval);
 141 }
 142
 143 int
 144 donlist_sysctl(void)
 145 {
 146         int mib[2];
 147         size_t size;
 148         fixpt_t xccpu;
 149         uint64_t memsize;
 150
 151         nlistread = 1;
 152         mib[0] = CTL_HW;
 153         mib[1] = HW_PHYSMEM64;
 154         size = sizeof(memsize);
 155         if (sysctl(mib, 2, &memsize, &size, NULL, 0) == 0)
 156                 mempages = memsize / getpagesize();
 157         else
 158                 mempages = 0;
 159
 160         mib[0] = CTL_KERN;
 161         mib[1] = KERN_FSCALE;
 162         size = sizeof(fscale);
 163         if (sysctl(mib, 2, &fscale, &size, NULL, 0) == -1)
 164                 fscale = (1 << 8);      /* XXX Hopefully reasonable default */
 165
 166         mib[0] = CTL_KERN;
 167         mib[1] = KERN_CCPU;
 168         size = sizeof(xccpu);
 169         if (sysctl(mib, 2, &xccpu, &size, NULL, 0) == -1)
 170                 ccpu = exp(-1.0 / 20.0); /* XXX Hopefully reasonable default */
 171         else
 172                 ccpu = (double)xccpu / fscale;
 173
 174         mib[0] = CTL_VM;
 175         mib[1] = VM_MAXSLP;
 176         size = sizeof(maxslp);
 177         if (sysctl(mib, 2, &maxslp, &size, NULL, 0) == -1)
 178 #ifdef MAXSLP
 179                 maxslp = MAXSLP;
 180 #else
 181                 maxslp = 20;            /* XXX Hopefully reasonable default */
 182 #endif
 183
 184         mib[0] = CTL_VM;
 185         mib[1] = VM_USPACE;
 186         size = sizeof(uspace);
 187         if (sysctl(mib, 2, &uspace, &size, NULL, 0) == -1)
 188 #ifdef USPACE
 189                 uspace = USPACE;
 190 #else
 191                 uspace = getpagesize(); /* XXX Hopefully reasonable default */
 192 #endif
 193
 194         return 0;
 195 }
 196
 197 void
 198 nlisterr(struct nlist nl[])
 199 {
 200         int i;
 201
 202         (void)fprintf(stderr, "ps: nlist: can't find following symbols:");
 203         for (i = 0; nl[i].n_name != NULL; i++)
 204                 if (nl[i].n_value == 0)
 205                         (void)fprintf(stderr, " %s", nl[i].n_name);
 206         (void)fprintf(stderr, "\n");
 207 }