libiberty/physmem.c

   1 /* Calculate the size of physical memory.
   2    Copyright 2000, 2001, 2003 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by Paul Eggert and Jim Meyering.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #if HAVE_UNISTD_H
  25 # include <unistd.h>
  26 #endif
  27
  28 #if HAVE_SYS_PSTAT_H
  29 # include <sys/pstat.h>
  30 #endif
  31
  32 #if HAVE_SYS_SYSMP_H
  33 #include <sys/sysmp.h>
  34 #endif
  35
  36 #include "libiberty.h"
  37
  38 /* Return the total amount of physical memory.  */
  39 double
  40 physmem_total ()
  41 {
  42 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
  43   {
  44     double pages = sysconf (_SC_PHYS_PAGES);
  45     double pagesize = sysconf (_SC_PAGESIZE);
  46     if (0 <= pages && 0 <= pagesize)
  47       return pages * pagesize;
  48   }
  49 #endif
  50
  51 #if HAVE_PSTAT_GETSTATIC
  52   { /* This works on hpux11.  */
  53     struct pst_static pss;
  54     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
  55       {
  56         double pages = pss.physical_memory;
  57         double pagesize = pss.page_size;
  58         if (0 <= pages && 0 <= pagesize)
  59           return pages * pagesize;
  60       }
  61   }
  62 #endif
  63
  64 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
  65   { /* This works on irix6. */
  66     struct rminfo realmem;
  67     if (sysmp(MP_SAGET, MPSA_RMINFO, &realmem, sizeof(realmem)) == 0)
  68       {
  69         double pagesize = sysconf (_SC_PAGESIZE);
  70         double pages = realmem.physmem;
  71         if (0 <= pages && 0 <= pagesize)
  72           return pages * pagesize;
  73       }
  74   }
  75 #endif
  76
  77   /* Return 0 if we can't determine the value.  */
  78   return 0;
  79 }
  80
  81 /* Return the amount of physical memory available.  */
  82 double
  83 physmem_available ()
  84 {
  85 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
  86   {
  87     double pages = sysconf (_SC_AVPHYS_PAGES);
  88     double pagesize = sysconf (_SC_PAGESIZE);
  89     if (0 <= pages && 0 <= pagesize)
  90       return pages * pagesize;
  91   }
  92 #endif
  93
  94 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
  95   { /* This works on hpux11.  */
  96     struct pst_static pss;
  97     struct pst_dynamic psd;
  98     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
  99         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 100       {
 101         double pages = psd.psd_free;
 102         double pagesize = pss.page_size;
 103         if (0 <= pages && 0 <= pagesize)
 104           return pages * pagesize;
 105       }
 106   }
 107 #endif
 108
 109 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 110   { /* This works on irix6. */
 111     struct rminfo realmem;
 112     if (sysmp(MP_SAGET, MPSA_RMINFO, &realmem, sizeof(realmem)) == 0)
 113       {
 114         double pagesize = sysconf (_SC_PAGESIZE);
 115         double pages = realmem.availrmem;
 116         if (0 <= pages && 0 <= pagesize)
 117           return pages * pagesize;
 118       }
 119   }
 120 #endif
 121
 122   /* Guess 25% of physical memory.  */
 123   return physmem_total () / 4;
 124 }
 125
 126
 127 #if DEBUG
 128
 129 # include <stdio.h>
 130 # include <stdlib.h>
 131
 132 int
 133 main ()
 134 {
 135   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 136   exit (0);
 137 }
 138
 139 #endif /* DEBUG */
 140
 141 /*
 142 Local Variables:
 143 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
 144 End:
 145 */