335 lines
8.1 KiB
C
335 lines
8.1 KiB
C
/* Calculate the size of physical memory.
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Copyright (C) 2000-2001, 2003, 2005-2006, 2009-2022 Free Software
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Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "physmem.h"
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#include <unistd.h>
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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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#if HAVE_SYS_SYSMP_H
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# include <sys/sysmp.h>
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#endif
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#if HAVE_SYS_SYSINFO_H
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# include <sys/sysinfo.h>
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#endif
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#if HAVE_MACHINE_HAL_SYSINFO_H
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# include <machine/hal_sysinfo.h>
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#endif
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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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#include <sys/types.h>
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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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#if HAVE_SYS_SYSCTL_H && ! defined __GLIBC__
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# include <sys/sysctl.h>
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#endif
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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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#ifdef _WIN32
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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/* Don't assume that UNICODE is not defined. */
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# undef GetModuleHandle
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# define GetModuleHandle GetModuleHandleA
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/* Avoid warnings from gcc -Wcast-function-type. */
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# define GetProcAddress \
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(void *) GetProcAddress
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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 BOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
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#endif
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#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
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/* Return the total amount of physical memory. */
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double
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physmem_total (void)
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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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#if HAVE_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
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{ /* This works on linux. */
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struct sysinfo si;
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if (sysinfo(&si) == 0)
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return (double) si.totalram * si.mem_unit;
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}
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#endif
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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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#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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#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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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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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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#if HAVE_SYSCTL && ! defined __GLIBC__ && 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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if (sysctl (mib, ARRAY_SIZE (mib), &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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#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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#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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if (!h)
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return 0.0;
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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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/* 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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/* Guess 64 MB. It's probably an older host, so guess small. */
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return 64 * 1024 * 1024;
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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 (void)
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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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#if HAVE_SYSINFO && HAVE_STRUCT_SYSINFO_MEM_UNIT
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{ /* This works on linux. */
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struct sysinfo si;
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if (sysinfo(&si) == 0)
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return ((double) si.freeram + si.bufferram) * si.mem_unit;
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}
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#endif
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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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#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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#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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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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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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#if HAVE_SYSCTL && ! defined __GLIBC__ && 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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if (sysctl (mib, ARRAY_SIZE (mib), &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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#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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if (!h)
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return 0.0;
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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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/* 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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/* Guess 25% of physical memory. */
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return physmem_total () / 4;
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}
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#if DEBUG
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# include <stdio.h>
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# include <stdlib.h>
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int
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main (void)
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{
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printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
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exit (0);
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}
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#endif /* DEBUG */
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/*
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Local Variables:
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compile-command: "gcc -DDEBUG -g -O -Wall -W physmem.c"
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End:
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*/
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