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/* Calculate the size of physical memory.

   Copyright 2000, 2001, 2003, 2004, 2005 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:

*/