lib/physmem.c

   1 /* Calculate the size of physical memory.
   2    Copyright (C) 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.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include "physmem.h"
  25
  26 #if HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29
  30 #if HAVE_SYS_PSTAT_H
  31 # include <sys/pstat.h>
  32 #endif
  33
  34 #if HAVE_SYS_SYSMP_H
  35 # include <sys/sysmp.h>
  36 #endif
  37
  38 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
  39 # include <sys/sysinfo.h>
  40 # include <machine/hal_sysinfo.h>
  41 #endif
  42
  43 #if HAVE_SYS_TABLE_H
  44 # include <sys/table.h>
  45 #endif
  46
  47 #include <sys/types.h>
  48
  49 #if HAVE_SYS_PARAM_H
  50 # include <sys/param.h>
  51 #endif
  52
  53 #if HAVE_SYS_SYSCTL_H
  54 # include <sys/sysctl.h>
  55 #endif
  56
  57 #if HAVE_SYS_SYSTEMCFG_H
  58 # include <sys/systemcfg.h>
  59 #endif
  60
  61 #ifdef _WIN32
  62 # define WIN32_LEAN_AND_MEAN
  63 # include <windows.h>
  64 /*  MEMORYSTATUSEX is missing from older windows headers, so define
  65     a local replacement.  */
  66 typedef struct
  67 {
  68   DWORD dwLength;
  69   DWORD dwMemoryLoad;
  70   DWORDLONG ullTotalPhys;
  71   DWORDLONG ullAvailPhys;
  72   DWORDLONG ullTotalPageFile;
  73   DWORDLONG ullAvailPageFile;
  74   DWORDLONG ullTotalVirtual;
  75   DWORDLONG ullAvailVirtual;
  76   DWORDLONG ullAvailExtendedVirtual;
  77 } lMEMORYSTATUSEX;
  78 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
  79 #endif
  80
  81 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
  82
  83 /* Return the total amount of physical memory.  */
  84 double
  85 physmem_total (void)
  86 {
  87 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
  88   { /* This works on linux-gnu, solaris2 and cygwin.  */
  89     double pages = sysconf (_SC_PHYS_PAGES);
  90     double pagesize = sysconf (_SC_PAGESIZE);
  91     if (0 <= pages && 0 <= pagesize)
  92       return pages * pagesize;
  93   }
  94 #endif
  95
  96 #if HAVE_PSTAT_GETSTATIC
  97   { /* This works on hpux11.  */
  98     struct pst_static pss;
  99     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
 100       {
 101         double pages = pss.physical_memory;
 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.physmem;
 116         if (0 <= pages && 0 <= pagesize)
 117           return pages * pagesize;
 118       }
 119   }
 120 #endif
 121
 122 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 123   { /* This works on Tru64 UNIX V4/5.  */
 124     int physmem;
 125
 126     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
 127                     NULL, NULL, NULL) == 1)
 128       {
 129         double kbytes = physmem;
 130
 131         if (0 <= kbytes)
 132           return kbytes * 1024.0;
 133       }
 134   }
 135 #endif
 136
 137 #if HAVE_SYSCTL && defined HW_PHYSMEM
 138   { /* This works on *bsd and darwin.  */
 139     unsigned int physmem;
 140     size_t len = sizeof physmem;
 141     static int mib[2] = { CTL_HW, HW_PHYSMEM };
 142
 143     if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
 144         && len == sizeof (physmem))
 145       return (double) physmem;
 146   }
 147 #endif
 148
 149 #if HAVE__SYSTEM_CONFIGURATION
 150   /* This works on AIX.  */
 151   return _system_configuration.physmem;
 152 #endif
 153
 154 #if defined _WIN32
 155   { /* this works on windows */
 156     PFN_MS_EX pfnex;
 157     HMODULE h = GetModuleHandle ("kernel32.dll");
 158
 159     if (!h)
 160       return 0.0;
 161
 162     /*  Use GlobalMemoryStatusEx if available.  */
 163     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 164       {
 165         lMEMORYSTATUSEX lms_ex;
 166         lms_ex.dwLength = sizeof lms_ex;
 167         if (!pfnex (&lms_ex))
 168           return 0.0;
 169         return (double) lms_ex.ullTotalPhys;
 170       }
 171
 172     /*  Fall back to GlobalMemoryStatus which is always available.
 173         but returns wrong results for physical memory > 4GB.  */
 174     else
 175       {
 176         MEMORYSTATUS ms;
 177         GlobalMemoryStatus (&ms);
 178         return (double) ms.dwTotalPhys;
 179       }
 180   }
 181 #endif
 182
 183   /* Guess 64 MB.  It's probably an older host, so guess small.  */
 184   return 64 * 1024 * 1024;
 185 }
 186
 187 /* Return the amount of physical memory available.  */
 188 double
 189 physmem_available (void)
 190 {
 191 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 192   { /* This works on linux-gnu, solaris2 and cygwin.  */
 193     double pages = sysconf (_SC_AVPHYS_PAGES);
 194     double pagesize = sysconf (_SC_PAGESIZE);
 195     if (0 <= pages && 0 <= pagesize)
 196       return pages * pagesize;
 197   }
 198 #endif
 199
 200 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 201   { /* This works on hpux11.  */
 202     struct pst_static pss;
 203     struct pst_dynamic psd;
 204     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
 205         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 206       {
 207         double pages = psd.psd_free;
 208         double pagesize = pss.page_size;
 209         if (0 <= pages && 0 <= pagesize)
 210           return pages * pagesize;
 211       }
 212   }
 213 #endif
 214
 215 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 216   { /* This works on irix6. */
 217     struct rminfo realmem;
 218     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 219       {
 220         double pagesize = sysconf (_SC_PAGESIZE);
 221         double pages = realmem.availrmem;
 222         if (0 <= pages && 0 <= pagesize)
 223           return pages * pagesize;
 224       }
 225   }
 226 #endif
 227
 228 #if HAVE_TABLE && defined TBL_VMSTATS
 229   { /* This works on Tru64 UNIX V4/5.  */
 230     struct tbl_vmstats vmstats;
 231
 232     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
 233       {
 234         double pages = vmstats.free_count;
 235         double pagesize = vmstats.pagesize;
 236
 237         if (0 <= pages && 0 <= pagesize)
 238           return pages * pagesize;
 239       }
 240   }
 241 #endif
 242
 243 #if HAVE_SYSCTL && defined HW_USERMEM
 244   { /* This works on *bsd and darwin.  */
 245     unsigned int usermem;
 246     size_t len = sizeof usermem;
 247     static int mib[2] = { CTL_HW, HW_USERMEM };
 248
 249     if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
 250         && len == sizeof (usermem))
 251       return (double) usermem;
 252   }
 253 #endif
 254
 255 #if defined _WIN32
 256   { /* this works on windows */
 257     PFN_MS_EX pfnex;
 258     HMODULE h = GetModuleHandle ("kernel32.dll");
 259
 260     if (!h)
 261       return 0.0;
 262
 263     /*  Use GlobalMemoryStatusEx if available.  */
 264     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 265       {
 266         lMEMORYSTATUSEX lms_ex;
 267         lms_ex.dwLength = sizeof lms_ex;
 268         if (!pfnex (&lms_ex))
 269           return 0.0;
 270         return (double) lms_ex.ullAvailPhys;
 271       }
 272
 273     /*  Fall back to GlobalMemoryStatus which is always available.
 274         but returns wrong results for physical memory > 4GB  */
 275     else
 276       {
 277         MEMORYSTATUS ms;
 278         GlobalMemoryStatus (&ms);
 279         return (double) ms.dwAvailPhys;
 280       }
 281   }
 282 #endif
 283
 284   /* Guess 25% of physical memory.  */
 285   return physmem_total () / 4;
 286 }
 287
 288
 289 #if DEBUG
 290
 291 # include <stdio.h>
 292 # include <stdlib.h>
 293
 294 int
 295 main (void)
 296 {
 297   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 298   exit (0);
 299 }
 300
 301 #endif /* DEBUG */
 302
 303 /*
 304 Local Variables:
 305 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
 306 End:
 307 */