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/* Calculate the size of physical memory.
Copyright 2000, 2001, 2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "physmem.h"
/* Return the total amount of physical memory. */
double
physmem_total ()
{
#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. */
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
/* Guess 64 MB. It's probably an older host, so guess small. */
return 64 * 1024 * 1024;
}
/* Return the amount of physical memory available. */
double
physmem_available ()
{
#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 ()
{
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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