physmem.c

   1 /* Calculate the size of physical memory.
   2
   3    Copyright (C) 2000, 2001, 2003, 2005, 2006 Free Software
   4    Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  19
  20 /* Written by Paul Eggert.  */
  21
  22 #include <unistd.h>
  23
  24 #if HAVE_SYS_PSTAT_H
  25 # include <sys/pstat.h>
  26 #endif
  27
  28 #if HAVE_SYS_SYSMP_H
  29 # include <sys/sysmp.h>
  30 #endif
  31
  32 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
  33 # include <sys/sysinfo.h>
  34 # include <machine/hal_sysinfo.h>
  35 #endif
  36
  37 #if HAVE_SYS_TABLE_H
  38 # include <sys/table.h>
  39 #endif
  40
  41 #include <sys/types.h>
  42
  43 #if HAVE_SYS_PARAM_H
  44 # include <sys/param.h>
  45 #endif
  46
  47 #if HAVE_SYS_SYSCTL_H
  48 # include <sys/sysctl.h>
  49 #endif
  50
  51 #if HAVE_SYS_SYSTEMCFG_H
  52 # include <sys/systemcfg.h>
  53 #endif
  54
  55 #ifdef _WIN32
  56 # define WIN32_LEAN_AND_MEAN
  57 # include <windows.h>
  58 /*  MEMORYSTATUSEX is missing from older windows headers, so define
  59     a local replacement.  */
  60 typedef struct
  61 {
  62   DWORD dwLength;
  63   DWORD dwMemoryLoad;
  64   DWORDLONG ullTotalPhys;
  65   DWORDLONG ullAvailPhys;
  66   DWORDLONG ullTotalPageFile;
  67   DWORDLONG ullAvailPageFile;
  68   DWORDLONG ullTotalVirtual;
  69   DWORDLONG ullAvailVirtual;
  70   DWORDLONG ullAvailExtendedVirtual;
  71 } lMEMORYSTATUSEX;
  72 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
  73 #endif
  74
  75 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
  76
  77 /* Return the total amount of physical memory.  */
  78 double
  79 physmem_total (void)
  80 {
  81 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
  82   { /* This works on linux-gnu, solaris2 and cygwin.  */
  83     double pages = sysconf (_SC_PHYS_PAGES);
  84     double pagesize = sysconf (_SC_PAGESIZE);
  85     if (0 <= pages && 0 <= pagesize)
  86       return pages * pagesize;
  87   }
  88 #endif
  89
  90 #if HAVE_PSTAT_GETSTATIC
  91   { /* This works on hpux11.  */
  92     struct pst_static pss;
  93     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
  94       {
  95         double pages = pss.physical_memory;
  96         double pagesize = pss.page_size;
  97         if (0 <= pages && 0 <= pagesize)
  98           return pages * pagesize;
  99       }
 100   }
 101 #endif
 102
 103 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 104   { /* This works on irix6. */
 105     struct rminfo realmem;
 106     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 107       {
 108         double pagesize = sysconf (_SC_PAGESIZE);
 109         double pages = realmem.physmem;
 110         if (0 <= pages && 0 <= pagesize)
 111           return pages * pagesize;
 112       }
 113   }
 114 #endif
 115
 116 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 117   { /* This works on Tru64 UNIX V4/5.  */
 118     int physmem;
 119
 120     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
 121                     NULL, NULL, NULL) == 1)
 122       {
 123         double kbytes = physmem;
 124
 125         if (0 <= kbytes)
 126           return kbytes * 1024.0;
 127       }
 128   }
 129 #endif
 130
 131 #if HAVE_SYSCTL && defined HW_PHYSMEM
 132   { /* This works on *bsd and darwin.  */
 133     unsigned int physmem;
 134     size_t len = sizeof physmem;
 135     static int mib[2] = { CTL_HW, HW_PHYSMEM };
 136
 137     if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
 138         && len == sizeof (physmem))
 139       return (double) physmem;
 140   }
 141 #endif
 142
 143 #if HAVE__SYSTEM_CONFIGURATION
 144   /* This works on AIX.  */
 145   return _system_configuration.physmem;
 146 #endif
 147
 148 #if defined _WIN32
 149   { /* this works on windows */
 150     PFN_MS_EX pfnex;
 151     HMODULE h = GetModuleHandle ("kernel32.dll");
 152
 153     if (!h)
 154       return 0.0;
 155
 156     /*  Use GlobalMemoryStatusEx if available.  */
 157     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 158       {
 159         lMEMORYSTATUSEX lms_ex;
 160         lms_ex.dwLength = sizeof lms_ex;
 161         if (!pfnex (&lms_ex))
 162           return 0.0;
 163         return (double) lms_ex.ullTotalPhys;
 164       }
 165
 166     /*  Fall back to GlobalMemoryStatus which is always available.
 167         but returns wrong results for physical memory > 4GB.  */
 168     else
 169       {
 170         MEMORYSTATUS ms;
 171         GlobalMemoryStatus (&ms);
 172         return (double) ms.dwTotalPhys;
 173       }
 174   }
 175 #endif
 176
 177   /* Guess 64 MB.  It's probably an older host, so guess small.  */
 178   return 64 * 1024 * 1024;
 179 }
 180
 181 /* Return the amount of physical memory available.  */
 182 double
 183 physmem_available (void)
 184 {
 185 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 186   { /* This works on linux-gnu, solaris2 and cygwin.  */
 187     double pages = sysconf (_SC_AVPHYS_PAGES);
 188     double pagesize = sysconf (_SC_PAGESIZE);
 189     if (0 <= pages && 0 <= pagesize)
 190       return pages * pagesize;
 191   }
 192 #endif
 193
 194 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 195   { /* This works on hpux11.  */
 196     struct pst_static pss;
 197     struct pst_dynamic psd;
 198     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
 199         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 200       {
 201         double pages = psd.psd_free;
 202         double pagesize = pss.page_size;
 203         if (0 <= pages && 0 <= pagesize)
 204           return pages * pagesize;
 205       }
 206   }
 207 #endif
 208
 209 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 210   { /* This works on irix6. */
 211     struct rminfo realmem;
 212     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 213       {
 214         double pagesize = sysconf (_SC_PAGESIZE);
 215         double pages = realmem.availrmem;
 216         if (0 <= pages && 0 <= pagesize)
 217           return pages * pagesize;
 218       }
 219   }
 220 #endif
 221
 222 #if HAVE_TABLE && defined TBL_VMSTATS
 223   { /* This works on Tru64 UNIX V4/5.  */
 224     struct tbl_vmstats vmstats;
 225
 226     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
 227       {
 228         double pages = vmstats.free_count;
 229         double pagesize = vmstats.pagesize;
 230
 231         if (0 <= pages && 0 <= pagesize)
 232           return pages * pagesize;
 233       }
 234   }
 235 #endif
 236
 237 #if HAVE_SYSCTL && defined HW_USERMEM
 238   { /* This works on *bsd and darwin.  */
 239     unsigned int usermem;
 240     size_t len = sizeof usermem;
 241     static int mib[2] = { CTL_HW, HW_USERMEM };
 242
 243     if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
 244         && len == sizeof (usermem))
 245       return (double) usermem;
 246   }
 247 #endif
 248
 249 #if defined _WIN32
 250   { /* this works on windows */
 251     PFN_MS_EX pfnex;
 252     HMODULE h = GetModuleHandle ("kernel32.dll");
 253
 254     if (!h)
 255       return 0.0;
 256
 257     /*  Use GlobalMemoryStatusEx if available.  */
 258     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 259       {
 260         lMEMORYSTATUSEX lms_ex;
 261         lms_ex.dwLength = sizeof lms_ex;
 262         if (!pfnex (&lms_ex))
 263           return 0.0;
 264         return (double) lms_ex.ullAvailPhys;
 265       }
 266
 267     /*  Fall back to GlobalMemoryStatus which is always available.
 268         but returns wrong results for physical memory > 4GB  */
 269     else
 270       {
 271         MEMORYSTATUS ms;
 272         GlobalMemoryStatus (&ms);
 273         return (double) ms.dwAvailPhys;
 274       }
 275   }
 276 #endif
 277
 278   /* Guess 25% of physical memory.  */
 279   return physmem_total () / 4;
 280 }
 281
 282
 283 #if DEBUG
 284
 285 # include <stdio.h>
 286 # include <stdlib.h>
 287
 288 int
 289 main (void)
 290 {
 291   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 292   exit (0);
 293 }
 294
 295 #endif /* DEBUG */
 296
 297 /*
 298 Local Variables:
 299 compile-command: "gcc -DDEBUG -g -O -Wall -W physmem.c"
 300 End:
 301 */