/* Calculate the size of physical memory.   Copyright (C) 2000-2026 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.  */doublephysmem_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.  */doublephysmem_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> intmain (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:*/