/* Calculate the size of physical memory.
  Copyright (C) 2000-2024 Free Software Foundation, Inc.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software Foundation,
  Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Paul Eggert.  */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#if HAVE_UNISTD_H
# include <unistd.h>
#endif

#if HAVE_SYS_PSTAT_H
# include <sys/pstat.h>
#endif

#if HAVE_SYS_SYSMP_H
# include <sys/sysmp.h>
#endif

#if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
# include <sys/sysinfo.h>
# include <machine/hal_sysinfo.h>
#endif

#if HAVE_SYS_TABLE_H
# include <sys/table.h>
#endif

#include <sys/types.h>

#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif

#if HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
#endif

#if HAVE_SYS_SYSTEMCFG_H
# include <sys/systemcfg.h>
#endif

#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
/*  MEMORYSTATUSEX is missing from older windows headers, so define
   a local replacement.  */
typedef struct
{
 DWORD dwLength;
 DWORD dwMemoryLoad;
 DWORDLONG ullTotalPhys;
 DWORDLONG ullAvailPhys;
 DWORDLONG ullTotalPageFile;
 DWORDLONG ullAvailPageFile;
 DWORDLONG ullTotalVirtual;
 DWORDLONG ullAvailVirtual;
 DWORDLONG ullAvailExtendedVirtual;
} lMEMORYSTATUSEX;
typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
#endif

#include "libiberty.h"

/* Return the total amount of physical memory.  */
double
physmem_total (void)
{
#if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
 { /* This works on linux-gnu, solaris2 and cygwin.  */
   double pages = sysconf (_SC_PHYS_PAGES);
   double pagesize = sysconf (_SC_PAGESIZE);
   if (0 <= pages && 0 <= pagesize)
     return pages * pagesize;
 }
#endif

#if HAVE_PSTAT_GETSTATIC
 { /* This works on hpux11.  */
   struct pst_static pss;
   if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
     {
       double pages = pss.physical_memory;
       double pagesize = pss.page_size;
       if (0 <= pages && 0 <= pagesize)
         return pages * pagesize;
     }
 }
#endif

#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 { /* This works on irix6. */
   struct rminfo realmem;
   if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
     {
       double pagesize = sysconf (_SC_PAGESIZE);
       double pages = realmem.physmem;
       if (0 <= pages && 0 <= pagesize)
         return pages * pagesize;
     }
 }
#endif

#if HAVE_GETSYSINFO && defined GSI_PHYSMEM
 { /* This works on Tru64 UNIX V4/5.  */
   int physmem;

   if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
                   NULL, NULL, NULL) == 1)
     {
       double kbytes = physmem;

       if (0 <= kbytes)
         return kbytes * 1024.0;
     }
 }
#endif

#if HAVE_SYSCTL && defined HW_PHYSMEM
 { /* This works on *bsd and darwin.  */
   unsigned int physmem;
   size_t len = sizeof physmem;
   static int mib[2] = { CTL_HW, HW_PHYSMEM };

   if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
       && len == sizeof (physmem))
     return (double) physmem;
 }
#endif

#if HAVE__SYSTEM_CONFIGURATION
 /* This works on AIX 4.3.3+.  */
 return _system_configuration.physmem;
#endif

#if defined _WIN32
 { /* this works on windows */
   PFN_MS_EX pfnex;
   HMODULE h = GetModuleHandle ("kernel32.dll");

   if (!h)
     return 0.0;

   /*  Use GlobalMemoryStatusEx if available.  */
   if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
     {
       lMEMORYSTATUSEX lms_ex;
       lms_ex.dwLength = sizeof lms_ex;
       if (!pfnex (&lms_ex))
         return 0.0;
       return (double) lms_ex.ullTotalPhys;
     }

   /*  Fall back to GlobalMemoryStatus which is always available.
       but returns wrong results for physical memory > 4GB.  */
   else
     {
       MEMORYSTATUS ms;
       GlobalMemoryStatus (&ms);
       return (double) ms.dwTotalPhys;
     }
 }
#endif

 /* Return 0 if we can't determine the value.  */
 return 0;
}

/* Return the amount of physical memory available.  */
double
physmem_available (void)
{
#if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
 { /* This works on linux-gnu, solaris2 and cygwin.  */
   double pages = sysconf (_SC_AVPHYS_PAGES);
   double pagesize = sysconf (_SC_PAGESIZE);
   if (0 <= pages && 0 <= pagesize)
     return pages * pagesize;
 }
#endif

#if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
 { /* This works on hpux11.  */
   struct pst_static pss;
   struct pst_dynamic psd;
   if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
       && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
     {
       double pages = psd.psd_free;
       double pagesize = pss.page_size;
       if (0 <= pages && 0 <= pagesize)
         return pages * pagesize;
     }
 }
#endif

#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
 { /* This works on irix6. */
   struct rminfo realmem;
   if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
     {
       double pagesize = sysconf (_SC_PAGESIZE);
       double pages = realmem.availrmem;
       if (0 <= pages && 0 <= pagesize)
         return pages * pagesize;
     }
 }
#endif

#if HAVE_TABLE && defined TBL_VMSTATS
 { /* This works on Tru64 UNIX V4/5.  */
   struct tbl_vmstats vmstats;

   if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
     {
       double pages = vmstats.free_count;
       double pagesize = vmstats.pagesize;

       if (0 <= pages && 0 <= pagesize)
         return pages * pagesize;
     }
 }
#endif

#if HAVE_SYSCTL && defined HW_USERMEM
 { /* This works on *bsd and darwin.  */
   unsigned int usermem;
   size_t len = sizeof usermem;
   static int mib[2] = { CTL_HW, HW_USERMEM };

   if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
       && len == sizeof (usermem))
     return (double) usermem;
 }
#endif

#if defined _WIN32
 { /* this works on windows */
   PFN_MS_EX pfnex;
   HMODULE h = GetModuleHandle ("kernel32.dll");

   if (!h)
     return 0.0;

   /*  Use GlobalMemoryStatusEx if available.  */
   if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
     {
       lMEMORYSTATUSEX lms_ex;
       lms_ex.dwLength = sizeof lms_ex;
       if (!pfnex (&lms_ex))
         return 0.0;
       return (double) lms_ex.ullAvailPhys;
     }

   /*  Fall back to GlobalMemoryStatus which is always available.
       but returns wrong results for physical memory > 4GB  */
   else
     {
       MEMORYSTATUS ms;
       GlobalMemoryStatus (&ms);
       return (double) ms.dwAvailPhys;
     }
 }
#endif

 /* Guess 25% of physical memory.  */
 return physmem_total () / 4;
}


#if DEBUG

# include <stdio.h>
# include <stdlib.h>

int
main (void)
{
 printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
 exit (0);
}

#endif /* DEBUG */

/*
Local Variables:
compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
End:
*/

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