lib/physmem.c

   1 /* Calculate the size of physical memory.
   2
   3    Copyright (C) 2000-2001, 2003, 2005-2006, 2009-2017 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 <http://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 # 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_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
  97   { /* This works on linux.  */
  98     struct sysinfo si;
  99     if (sysinfo(&si) == 0)
 100       return (double) si.totalram * si.mem_unit;
 101   }
 102 #endif
 103
 104 #if HAVE_PSTAT_GETSTATIC
 105   { /* This works on hpux11.  */
 106     struct pst_static pss;
 107     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
 108       {
 109         double pages = pss.physical_memory;
 110         double pagesize = pss.page_size;
 111         if (0 <= pages && 0 <= pagesize)
 112           return pages * pagesize;
 113       }
 114   }
 115 #endif
 116
 117 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 118   { /* This works on irix6. */
 119     struct rminfo realmem;
 120     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 121       {
 122         double pagesize = sysconf (_SC_PAGESIZE);
 123         double pages = realmem.physmem;
 124         if (0 <= pages && 0 <= pagesize)
 125           return pages * pagesize;
 126       }
 127   }
 128 #endif
 129
 130 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 131   { /* This works on Tru64 UNIX V4/5.  */
 132     int physmem;
 133
 134     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
 135                     NULL, NULL, NULL) == 1)
 136       {
 137         double kbytes = physmem;
 138
 139         if (0 <= kbytes)
 140           return kbytes * 1024.0;
 141       }
 142   }
 143 #endif
 144
 145 #if HAVE_SYSCTL && defined HW_PHYSMEM
 146   { /* This works on *bsd and darwin.  */
 147     unsigned int physmem;
 148     size_t len = sizeof physmem;
 149     static int mib[2] = { CTL_HW, HW_PHYSMEM };
 150
 151     if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
 152         && len == sizeof (physmem))
 153       return (double) physmem;
 154   }
 155 #endif
 156
 157 #if HAVE__SYSTEM_CONFIGURATION
 158   /* This works on AIX.  */
 159   return _system_configuration.physmem;
 160 #endif
 161
 162 #if defined _WIN32
 163   { /* this works on windows */
 164     PFN_MS_EX pfnex;
 165     HMODULE h = GetModuleHandle ("kernel32.dll");
 166
 167     if (!h)
 168       return 0.0;
 169
 170     /*  Use GlobalMemoryStatusEx if available.  */
 171     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 172       {
 173         lMEMORYSTATUSEX lms_ex;
 174         lms_ex.dwLength = sizeof lms_ex;
 175         if (!pfnex (&lms_ex))
 176           return 0.0;
 177         return (double) lms_ex.ullTotalPhys;
 178       }
 179
 180     /*  Fall back to GlobalMemoryStatus which is always available.
 181         but returns wrong results for physical memory > 4GB.  */
 182     else
 183       {
 184         MEMORYSTATUS ms;
 185         GlobalMemoryStatus (&ms);
 186         return (double) ms.dwTotalPhys;
 187       }
 188   }
 189 #endif
 190
 191   /* Guess 64 MB.  It's probably an older host, so guess small.  */
 192   return 64 * 1024 * 1024;
 193 }
 194
 195 /* Return the amount of physical memory available.  */
 196 double
 197 physmem_available (void)
 198 {
 199 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 200   { /* This works on linux-gnu, solaris2 and cygwin.  */
 201     double pages = sysconf (_SC_AVPHYS_PAGES);
 202     double pagesize = sysconf (_SC_PAGESIZE);
 203     if (0 <= pages && 0 <= pagesize)
 204       return pages * pagesize;
 205   }
 206 #endif
 207
 208 #if HAVE_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
 209   { /* This works on linux.  */
 210     struct sysinfo si;
 211     if (sysinfo(&si) == 0)
 212       return ((double) si.freeram + si.bufferram) * si.mem_unit;
 213   }
 214 #endif
 215
 216 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 217   { /* This works on hpux11.  */
 218     struct pst_static pss;
 219     struct pst_dynamic psd;
 220     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
 221         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 222       {
 223         double pages = psd.psd_free;
 224         double pagesize = pss.page_size;
 225         if (0 <= pages && 0 <= pagesize)
 226           return pages * pagesize;
 227       }
 228   }
 229 #endif
 230
 231 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 232   { /* This works on irix6. */
 233     struct rminfo realmem;
 234     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 235       {
 236         double pagesize = sysconf (_SC_PAGESIZE);
 237         double pages = realmem.availrmem;
 238         if (0 <= pages && 0 <= pagesize)
 239           return pages * pagesize;
 240       }
 241   }
 242 #endif
 243
 244 #if HAVE_TABLE && defined TBL_VMSTATS
 245   { /* This works on Tru64 UNIX V4/5.  */
 246     struct tbl_vmstats vmstats;
 247
 248     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
 249       {
 250         double pages = vmstats.free_count;
 251         double pagesize = vmstats.pagesize;
 252
 253         if (0 <= pages && 0 <= pagesize)
 254           return pages * pagesize;
 255       }
 256   }
 257 #endif
 258
 259 #if HAVE_SYSCTL && defined HW_USERMEM
 260   { /* This works on *bsd and darwin.  */
 261     unsigned int usermem;
 262     size_t len = sizeof usermem;
 263     static int mib[2] = { CTL_HW, HW_USERMEM };
 264
 265     if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
 266         && len == sizeof (usermem))
 267       return (double) usermem;
 268   }
 269 #endif
 270
 271 #if defined _WIN32
 272   { /* this works on windows */
 273     PFN_MS_EX pfnex;
 274     HMODULE h = GetModuleHandle ("kernel32.dll");
 275
 276     if (!h)
 277       return 0.0;
 278
 279     /*  Use GlobalMemoryStatusEx if available.  */
 280     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 281       {
 282         lMEMORYSTATUSEX lms_ex;
 283         lms_ex.dwLength = sizeof lms_ex;
 284         if (!pfnex (&lms_ex))
 285           return 0.0;
 286         return (double) lms_ex.ullAvailPhys;
 287       }
 288
 289     /*  Fall back to GlobalMemoryStatus which is always available.
 290         but returns wrong results for physical memory > 4GB  */
 291     else
 292       {
 293         MEMORYSTATUS ms;
 294         GlobalMemoryStatus (&ms);
 295         return (double) ms.dwAvailPhys;
 296       }
 297   }
 298 #endif
 299
 300   /* Guess 25% of physical memory.  */
 301   return physmem_total () / 4;
 302 }
 303
 304
 305 #if DEBUG
 306
 307 # include <stdio.h>
 308 # include <stdlib.h>
 309
 310 int
 311 main (void)
 312 {
 313   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 314   exit (0);
 315 }
 316
 317 #endif /* DEBUG */
 318
 319 /*
 320 Local Variables:
 321 compile-command: "gcc -DDEBUG -g -O -Wall -W physmem.c"
 322 End:
 323 */