lib/physmem.c

   1 /* Calculate the size of physical memory.
   2
   3    Copyright (C) 2000-2001, 2003, 2005-2006, 2009-2018 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 3 of the License, or
   9    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  18
  19 /* Written by Paul Eggert.  */
  20
  21 #include <config.h>
  22
  23 #include "physmem.h"
  24
  25 #include <unistd.h>
  26
  27 #if HAVE_SYS_PSTAT_H
  28 # include <sys/pstat.h>
  29 #endif
  30
  31 #if HAVE_SYS_SYSMP_H
  32 # include <sys/sysmp.h>
  33 #endif
  34
  35 #if HAVE_SYS_SYSINFO_H
  36 # include <sys/sysinfo.h>
  37 #endif
  38
  39 #if HAVE_MACHINE_HAL_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
  63 # define WIN32_LEAN_AND_MEAN
  64 # include <windows.h>
  65
  66 /* Avoid warnings from gcc -Wcast-function-type.  */
  67 # define GetProcAddress \
  68    (void *) GetProcAddress
  69
  70 /*  MEMORYSTATUSEX is missing from older windows headers, so define
  71     a local replacement.  */
  72 typedef struct
  73 {
  74   DWORD dwLength;
  75   DWORD dwMemoryLoad;
  76   DWORDLONG ullTotalPhys;
  77   DWORDLONG ullAvailPhys;
  78   DWORDLONG ullTotalPageFile;
  79   DWORDLONG ullAvailPageFile;
  80   DWORDLONG ullTotalVirtual;
  81   DWORDLONG ullAvailVirtual;
  82   DWORDLONG ullAvailExtendedVirtual;
  83 } lMEMORYSTATUSEX;
  84 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
  85
  86 #endif
  87
  88 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
  89
  90 /* Return the total amount of physical memory.  */
  91 double
  92 physmem_total (void)
  93 {
  94 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
  95   { /* This works on linux-gnu, solaris2 and cygwin.  */
  96     double pages = sysconf (_SC_PHYS_PAGES);
  97     double pagesize = sysconf (_SC_PAGESIZE);
  98     if (0 <= pages && 0 <= pagesize)
  99       return pages * pagesize;
 100   }
 101 #endif
 102
 103 #if HAVE_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
 104   { /* This works on linux.  */
 105     struct sysinfo si;
 106     if (sysinfo(&si) == 0)
 107       return (double) si.totalram * si.mem_unit;
 108   }
 109 #endif
 110
 111 #if HAVE_PSTAT_GETSTATIC
 112   { /* This works on hpux11.  */
 113     struct pst_static pss;
 114     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
 115       {
 116         double pages = pss.physical_memory;
 117         double pagesize = pss.page_size;
 118         if (0 <= pages && 0 <= pagesize)
 119           return pages * pagesize;
 120       }
 121   }
 122 #endif
 123
 124 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 125   { /* This works on irix6. */
 126     struct rminfo realmem;
 127     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 128       {
 129         double pagesize = sysconf (_SC_PAGESIZE);
 130         double pages = realmem.physmem;
 131         if (0 <= pages && 0 <= pagesize)
 132           return pages * pagesize;
 133       }
 134   }
 135 #endif
 136
 137 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 138   { /* This works on Tru64 UNIX V4/5.  */
 139     int physmem;
 140
 141     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
 142                     NULL, NULL, NULL) == 1)
 143       {
 144         double kbytes = physmem;
 145
 146         if (0 <= kbytes)
 147           return kbytes * 1024.0;
 148       }
 149   }
 150 #endif
 151
 152 #if HAVE_SYSCTL && defined HW_PHYSMEM
 153   { /* This works on *bsd and darwin.  */
 154     unsigned int physmem;
 155     size_t len = sizeof physmem;
 156     static int mib[2] = { CTL_HW, HW_PHYSMEM };
 157
 158     if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
 159         && len == sizeof (physmem))
 160       return (double) physmem;
 161   }
 162 #endif
 163
 164 #if HAVE__SYSTEM_CONFIGURATION
 165   /* This works on AIX.  */
 166   return _system_configuration.physmem;
 167 #endif
 168
 169 #if defined _WIN32
 170   { /* this works on windows */
 171     PFN_MS_EX pfnex;
 172     HMODULE h = GetModuleHandle ("kernel32.dll");
 173
 174     if (!h)
 175       return 0.0;
 176
 177     /*  Use GlobalMemoryStatusEx if available.  */
 178     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 179       {
 180         lMEMORYSTATUSEX lms_ex;
 181         lms_ex.dwLength = sizeof lms_ex;
 182         if (!pfnex (&lms_ex))
 183           return 0.0;
 184         return (double) lms_ex.ullTotalPhys;
 185       }
 186
 187     /*  Fall back to GlobalMemoryStatus which is always available.
 188         but returns wrong results for physical memory > 4GB.  */
 189     else
 190       {
 191         MEMORYSTATUS ms;
 192         GlobalMemoryStatus (&ms);
 193         return (double) ms.dwTotalPhys;
 194       }
 195   }
 196 #endif
 197
 198   /* Guess 64 MB.  It's probably an older host, so guess small.  */
 199   return 64 * 1024 * 1024;
 200 }
 201
 202 /* Return the amount of physical memory available.  */
 203 double
 204 physmem_available (void)
 205 {
 206 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 207   { /* This works on linux-gnu, solaris2 and cygwin.  */
 208     double pages = sysconf (_SC_AVPHYS_PAGES);
 209     double pagesize = sysconf (_SC_PAGESIZE);
 210     if (0 <= pages && 0 <= pagesize)
 211       return pages * pagesize;
 212   }
 213 #endif
 214
 215 #if HAVE_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
 216   { /* This works on linux.  */
 217     struct sysinfo si;
 218     if (sysinfo(&si) == 0)
 219       return ((double) si.freeram + si.bufferram) * si.mem_unit;
 220   }
 221 #endif
 222
 223 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 224   { /* This works on hpux11.  */
 225     struct pst_static pss;
 226     struct pst_dynamic psd;
 227     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
 228         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 229       {
 230         double pages = psd.psd_free;
 231         double pagesize = pss.page_size;
 232         if (0 <= pages && 0 <= pagesize)
 233           return pages * pagesize;
 234       }
 235   }
 236 #endif
 237
 238 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 239   { /* This works on irix6. */
 240     struct rminfo realmem;
 241     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 242       {
 243         double pagesize = sysconf (_SC_PAGESIZE);
 244         double pages = realmem.availrmem;
 245         if (0 <= pages && 0 <= pagesize)
 246           return pages * pagesize;
 247       }
 248   }
 249 #endif
 250
 251 #if HAVE_TABLE && defined TBL_VMSTATS
 252   { /* This works on Tru64 UNIX V4/5.  */
 253     struct tbl_vmstats vmstats;
 254
 255     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
 256       {
 257         double pages = vmstats.free_count;
 258         double pagesize = vmstats.pagesize;
 259
 260         if (0 <= pages && 0 <= pagesize)
 261           return pages * pagesize;
 262       }
 263   }
 264 #endif
 265
 266 #if HAVE_SYSCTL && defined HW_USERMEM
 267   { /* This works on *bsd and darwin.  */
 268     unsigned int usermem;
 269     size_t len = sizeof usermem;
 270     static int mib[2] = { CTL_HW, HW_USERMEM };
 271
 272     if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
 273         && len == sizeof (usermem))
 274       return (double) usermem;
 275   }
 276 #endif
 277
 278 #if defined _WIN32
 279   { /* this works on windows */
 280     PFN_MS_EX pfnex;
 281     HMODULE h = GetModuleHandle ("kernel32.dll");
 282
 283     if (!h)
 284       return 0.0;
 285
 286     /*  Use GlobalMemoryStatusEx if available.  */
 287     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 288       {
 289         lMEMORYSTATUSEX lms_ex;
 290         lms_ex.dwLength = sizeof lms_ex;
 291         if (!pfnex (&lms_ex))
 292           return 0.0;
 293         return (double) lms_ex.ullAvailPhys;
 294       }
 295
 296     /*  Fall back to GlobalMemoryStatus which is always available.
 297         but returns wrong results for physical memory > 4GB  */
 298     else
 299       {
 300         MEMORYSTATUS ms;
 301         GlobalMemoryStatus (&ms);
 302         return (double) ms.dwAvailPhys;
 303       }
 304   }
 305 #endif
 306
 307   /* Guess 25% of physical memory.  */
 308   return physmem_total () / 4;
 309 }
 310
 311
 312 #if DEBUG
 313
 314 # include <stdio.h>
 315 # include <stdlib.h>
 316
 317 int
 318 main (void)
 319 {
 320   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 321   exit (0);
 322 }
 323
 324 #endif /* DEBUG */
 325
 326 /*
 327 Local Variables:
 328 compile-command: "gcc -DDEBUG -g -O -Wall -W physmem.c"
 329 End:
 330 */