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.  */
  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 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
  37 # include <sys/sysinfo.h>
  38 # include <machine/hal_sysinfo.h>
  39 #endif
  40
  41 #if HAVE_SYS_TABLE_H
  42 # include <sys/table.h>
  43 #endif
  44
  45 #include <sys/types.h>
  46
  47 #if HAVE_SYS_PARAM_H
  48 # include <sys/param.h>
  49 #endif
  50
  51 #if HAVE_SYS_SYSCTL_H
  52 # include <sys/sysctl.h>
  53 #endif
  54
  55 #if HAVE_SYS_SYSTEMCFG_H
  56 # include <sys/systemcfg.h>
  57 #endif
  58
  59 #ifdef _WIN32
  60 #define WIN32_LEAN_AND_MEAN
  61 #include <windows.h>
  62 /*  MEMORYSTATUSEX is missing from older windows headers, so define
  63     a local replacement.  */
  64 typedef struct  {
  65         DWORD dwLength;
  66         DWORD dwMemoryLoad;
  67         DWORDLONG ullTotalPhys;
  68         DWORDLONG ullAvailPhys;
  69         DWORDLONG ullTotalPageFile;
  70         DWORDLONG ullAvailPageFile;
  71         DWORDLONG ullTotalVirtual;
  72         DWORDLONG ullAvailVirtual;
  73         DWORDLONG ullAvailExtendedVirtual;
  74 } lMEMORYSTATUSEX;
  75 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
  76 #endif
  77
  78 #include "libiberty.h"
  79
  80 /* Return the total amount of physical memory.  */
  81 double
  82 physmem_total ()
  83 {
  84 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
  85   {
  86     double pages = sysconf (_SC_PHYS_PAGES);
  87     double pagesize = sysconf (_SC_PAGESIZE);
  88     if (0 <= pages && 0 <= pagesize)
  89       return pages * pagesize;
  90   }
  91 #endif
  92
  93 #if HAVE_PSTAT_GETSTATIC
  94   { /* This works on hpux11.  */
  95     struct pst_static pss;
  96     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
  97       {
  98         double pages = pss.physical_memory;
  99         double pagesize = pss.page_size;
 100         if (0 <= pages && 0 <= pagesize)
 101           return pages * pagesize;
 102       }
 103   }
 104 #endif
 105
 106 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 107   { /* This works on irix6. */
 108     struct rminfo realmem;
 109     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 110       {
 111         double pagesize = sysconf (_SC_PAGESIZE);
 112         double pages = realmem.physmem;
 113         if (0 <= pages && 0 <= pagesize)
 114           return pages * pagesize;
 115       }
 116   }
 117 #endif
 118
 119 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 120   { /* This works on Tru64 UNIX V4/5.  */
 121     int physmem;
 122
 123     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
 124                     NULL, NULL, NULL) == 1)
 125       {
 126         double kbytes = physmem;
 127
 128         if (0 <= kbytes)
 129           return kbytes * 1024.0;
 130       }
 131   }
 132 #endif
 133
 134 #if HAVE_SYSCTL && defined HW_PHYSMEM
 135   { /* This works on *bsd and darwin.  */
 136     unsigned int physmem;
 137     size_t len = sizeof(physmem);
 138     static int mib[2] = {CTL_HW, HW_PHYSMEM};
 139
 140     if (sysctl(mib, ARRAY_SIZE(mib), &physmem, &len, NULL, 0) == 0
 141         && len == sizeof (physmem))
 142       return (double)physmem;
 143   }
 144 #endif
 145
 146 #if HAVE__SYSTEM_CONFIGURATION
 147   /* This works on AIX.  */
 148   return _system_configuration.physmem;
 149 #endif
 150
 151 #if defined _WIN32
 152   { /* this works on windows */
 153     PFN_MS_EX pfnex;
 154     HMODULE h = GetModuleHandle("kernel32.dll");
 155
 156     if (!h)
 157       return 0.0;
 158
 159     /*  Use GlobalMemoryStatusEx if available.  */
 160     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 161       {
 162         lMEMORYSTATUSEX lms_ex;
 163         lms_ex.dwLength = sizeof lms_ex;
 164         if (!pfnex (&lms_ex))
 165           return 0.0;
 166         return (double)lms_ex.ullTotalPhys;
 167       }
 168
 169     /*  Fall back to GlobalMemoryStatus which is always available.
 170         but returns wrong results for physical memory > 4GB.  */
 171     else
 172       {
 173         MEMORYSTATUS ms;
 174         GlobalMemoryStatus (&ms);
 175         return (double)ms.dwTotalPhys;
 176       }
 177    }
 178 #endif
 179
 180   /* Return 0 if we can't determine the value.  */
 181   return 0;
 182 }
 183
 184 /* Return the amount of physical memory available.  */
 185 double
 186 physmem_available ()
 187 {
 188 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 189   {
 190     double pages = sysconf (_SC_AVPHYS_PAGES);
 191     double pagesize = sysconf (_SC_PAGESIZE);
 192     if (0 <= pages && 0 <= pagesize)
 193       return pages * pagesize;
 194   }
 195 #endif
 196
 197 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 198   { /* This works on hpux11.  */
 199     struct pst_static pss;
 200     struct pst_dynamic psd;
 201     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
 202         && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
 203       {
 204         double pages = psd.psd_free;
 205         double pagesize = pss.page_size;
 206         if (0 <= pages && 0 <= pagesize)
 207           return pages * pagesize;
 208       }
 209   }
 210 #endif
 211
 212 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 213   { /* This works on irix6. */
 214     struct rminfo realmem;
 215     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
 216       {
 217         double pagesize = sysconf (_SC_PAGESIZE);
 218         double pages = realmem.availrmem;
 219         if (0 <= pages && 0 <= pagesize)
 220           return pages * pagesize;
 221       }
 222   }
 223 #endif
 224
 225 #if HAVE_TABLE && defined TBL_VMSTATS
 226   { /* This works on Tru64 UNIX V4/5.  */
 227     struct tbl_vmstats vmstats;
 228
 229     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
 230       {
 231         double pages = vmstats.free_count;
 232         double pagesize = vmstats.pagesize;
 233
 234         if (0 <= pages && 0 <= pagesize)
 235           return pages * pagesize;
 236       }
 237   }
 238 #endif
 239
 240 #if HAVE_SYSCTL && defined HW_USERMEM
 241   { /* This works on *bsd and darwin.  */
 242     unsigned int usermem;
 243     size_t len = sizeof(usermem);
 244     static int mib[2] = {CTL_HW, HW_USERMEM};
 245
 246     if (sysctl(mib, ARRAY_SIZE(mib), &usermem, &len, NULL, 0) == 0
 247         && len == sizeof (usermem))
 248       return (double)usermem;
 249   }
 250 #endif
 251
 252 #if defined _WIN32
 253   { /* this works on windows */
 254     PFN_MS_EX pfnex;
 255     HMODULE h = GetModuleHandle ("kernel32.dll");
 256
 257     if (!h)
 258       return 0.0;
 259
 260     /*  Use GlobalMemoryStatusEx if available.  */
 261     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
 262       {
 263         lMEMORYSTATUSEX lms_ex;
 264         lms_ex.dwLength = sizeof lms_ex;
 265         if (!pfnex (&lms_ex))
 266           return 0.0;
 267         return (double) lms_ex.ullAvailPhys;
 268       }
 269
 270     /*  Fall back to GlobalMemoryStatus which is always available.
 271         but returns wrong results for physical memory > 4GB  */
 272     else
 273       {
 274         MEMORYSTATUS ms;
 275         GlobalMemoryStatus (&ms);
 276         return (double)ms.dwAvailPhys;
 277       }
 278   }
 279 #endif
 280
 281   /* Guess 25% of physical memory.  */
 282   return physmem_total () / 4;
 283 }
 284
 285
 286 #if DEBUG
 287
 288 # include <stdio.h>
 289 # include <stdlib.h>
 290
 291 int
 292 main ()
 293 {
 294   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 295   exit (0);
 296 }
 297
 298 #endif /* DEBUG */
 299
 300 /*
 301 Local Variables:
 302 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
 303 End:
 304 */