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/* Calculate the size of physical memory. |
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Copyright 2000, 2001, 2003 Free Software Foundation, Inc. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software Foundation, |
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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|
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/* Written by Paul Eggert. */ |
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|
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#include "config.h" |
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|
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#if HAVE_UNISTD_H |
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# include <unistd.h> |
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#endif |
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|
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#if HAVE_SYS_PSTAT_H |
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# include <sys/pstat.h> |
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#endif |
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|
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#if HAVE_SYS_SYSMP_H |
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# include <sys/sysmp.h> |
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#endif |
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|
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#if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H |
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# include <sys/sysinfo.h> |
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# include <machine/hal_sysinfo.h> |
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#endif |
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|
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#if HAVE_SYS_TABLE_H |
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# include <sys/table.h> |
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#endif |
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|
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#include <sys/types.h> |
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|
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#if HAVE_SYS_PARAM_H |
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# include <sys/param.h> |
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#endif |
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|
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#if HAVE_SYS_SYSCTL_H |
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# include <sys/sysctl.h> |
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#endif |
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|
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#if HAVE_SYS_SYSTEMCFG_H |
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# include <sys/systemcfg.h> |
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#endif |
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|
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#ifdef _WIN32 |
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# define WIN32_LEAN_AND_MEAN |
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# include <windows.h> |
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/* MEMORYSTATUSEX is missing from older windows headers, so define |
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a local replacement. */ |
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typedef struct |
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{ |
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DWORD dwLength; |
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DWORD dwMemoryLoad; |
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DWORDLONG ullTotalPhys; |
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DWORDLONG ullAvailPhys; |
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DWORDLONG ullTotalPageFile; |
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DWORDLONG ullAvailPageFile; |
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DWORDLONG ullTotalVirtual; |
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DWORDLONG ullAvailVirtual; |
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DWORDLONG ullAvailExtendedVirtual; |
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} lMEMORYSTATUSEX; |
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typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*); |
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#endif |
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|
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/* Return the total amount of physical memory. */ |
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double |
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physmem_total () |
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{ |
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#if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE |
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{ /* This works on linux-gnu, solaris2 and cygwin. */ |
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double pages = sysconf (_SC_PHYS_PAGES); |
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double pagesize = sysconf (_SC_PAGESIZE); |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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#endif |
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|
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#if HAVE_PSTAT_GETSTATIC |
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{ /* This works on hpux11. */ |
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struct pst_static pss; |
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if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)) |
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{ |
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double pages = pss.physical_memory; |
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double pagesize = pss.page_size; |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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} |
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#endif |
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|
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#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE |
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{ /* This works on irix6. */ |
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struct rminfo realmem; |
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if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0) |
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{ |
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double pagesize = sysconf (_SC_PAGESIZE); |
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double pages = realmem.physmem; |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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} |
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#endif |
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|
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#if HAVE_GETSYSINFO && defined GSI_PHYSMEM |
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{ /* This works on Tru64 UNIX V4/5. */ |
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int physmem; |
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|
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if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem), |
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NULL, NULL, NULL) == 1) |
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{ |
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double kbytes = physmem; |
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|
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if (0 <= kbytes) |
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return kbytes * 1024.0; |
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} |
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} |
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#endif |
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|
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#if HAVE_SYSCTL && defined HW_PHYSMEM |
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{ /* This works on *bsd and darwin. */ |
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unsigned int physmem; |
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size_t len = sizeof physmem; |
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static int mib[2] = { CTL_HW, HW_PHYSMEM }; |
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|
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if (sysctl (mib, 2, &physmem, &len, NULL, 0) == 0 |
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&& len == sizeof (physmem)) |
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return (double) physmem; |
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} |
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#endif |
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|
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#if HAVE__SYSTEM_CONFIGURATION |
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/* This works on AIX. */ |
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return _system_configuration.physmem; |
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#endif |
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|
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#if defined _WIN32 |
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{ /* this works on windows */ |
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PFN_MS_EX pfnex; |
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HMODULE h = GetModuleHandle ("kernel32.dll"); |
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|
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if (!h) |
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return 0.0; |
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|
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/* Use GlobalMemoryStatusEx if available. */ |
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if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx"))) |
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{ |
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lMEMORYSTATUSEX lms_ex; |
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lms_ex.dwLength = sizeof lms_ex; |
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if (!pfnex (&lms_ex)) |
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return 0.0; |
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return (double) lms_ex.ullTotalPhys; |
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} |
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|
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/* Fall back to GlobalMemoryStatus which is always available. |
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but returns wrong results for physical memory > 4GB. */ |
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else |
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{ |
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MEMORYSTATUS ms; |
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GlobalMemoryStatus (&ms); |
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return (double) ms.dwTotalPhys; |
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} |
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} |
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#endif |
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|
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/* Return 0 if we can't determine the value. */ |
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return 0; |
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} |
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|
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/* Return the amount of physical memory available. */ |
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double |
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physmem_available () |
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{ |
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#if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE |
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{ /* This works on linux-gnu, solaris2 and cygwin. */ |
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double pages = sysconf (_SC_AVPHYS_PAGES); |
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double pagesize = sysconf (_SC_PAGESIZE); |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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#endif |
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|
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#if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC |
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{ /* This works on hpux11. */ |
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struct pst_static pss; |
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struct pst_dynamic psd; |
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if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0) |
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&& 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0)) |
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{ |
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double pages = psd.psd_free; |
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double pagesize = pss.page_size; |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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} |
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#endif |
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|
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#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE |
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{ /* This works on irix6. */ |
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struct rminfo realmem; |
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if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0) |
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{ |
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double pagesize = sysconf (_SC_PAGESIZE); |
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double pages = realmem.availrmem; |
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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} |
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#endif |
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|
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#if HAVE_TABLE && defined TBL_VMSTATS |
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{ /* This works on Tru64 UNIX V4/5. */ |
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struct tbl_vmstats vmstats; |
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|
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if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1) |
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{ |
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double pages = vmstats.free_count; |
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double pagesize = vmstats.pagesize; |
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|
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if (0 <= pages && 0 <= pagesize) |
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return pages * pagesize; |
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} |
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} |
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#endif |
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|
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#if HAVE_SYSCTL && defined HW_USERMEM |
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{ /* This works on *bsd and darwin. */ |
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unsigned int usermem; |
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size_t len = sizeof usermem; |
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static int mib[2] = { CTL_HW, HW_USERMEM }; |
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|
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if (sysctl (mib, 2, &usermem, &len, NULL, 0) == 0 |
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&& len == sizeof (usermem)) |
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return (double) usermem; |
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} |
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#endif |
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|
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#if defined _WIN32 |
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{ /* this works on windows */ |
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PFN_MS_EX pfnex; |
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HMODULE h = GetModuleHandle ("kernel32.dll"); |
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|
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if (!h) |
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return 0.0; |
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|
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/* Use GlobalMemoryStatusEx if available. */ |
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if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx"))) |
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{ |
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lMEMORYSTATUSEX lms_ex; |
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lms_ex.dwLength = sizeof lms_ex; |
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if (!pfnex (&lms_ex)) |
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return 0.0; |
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return (double) lms_ex.ullAvailPhys; |
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} |
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|
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/* Fall back to GlobalMemoryStatus which is always available. |
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but returns wrong results for physical memory > 4GB */ |
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else |
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{ |
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MEMORYSTATUS ms; |
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GlobalMemoryStatus (&ms); |
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return (double) ms.dwAvailPhys; |
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} |
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} |
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#endif |
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|
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/* Guess 25% of physical memory. */ |
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return physmem_total () / 4; |
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} |
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|
