1 /* Calculate the size of physical memory.
3 Copyright (C) 2000, 2001, 2003, 2005, 2006 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Paul Eggert. */
28 # include <sys/pstat.h>
32 # include <sys/sysmp.h>
35 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
36 # include <sys/sysinfo.h>
37 # include <machine/hal_sysinfo.h>
41 # include <sys/table.h>
44 #include <sys/types.h>
47 # include <sys/param.h>
51 # include <sys/sysctl.h>
54 #if HAVE_SYS_SYSTEMCFG_H
55 # include <sys/systemcfg.h>
59 # define WIN32_LEAN_AND_MEAN
61 /* MEMORYSTATUSEX is missing from older windows headers, so define
62 a local replacement. */
67 DWORDLONG ullTotalPhys;
68 DWORDLONG ullAvailPhys;
69 DWORDLONG ullTotalPageFile;
70 DWORDLONG ullAvailPageFile;
71 DWORDLONG ullTotalVirtual;
72 DWORDLONG ullAvailVirtual;
73 DWORDLONG ullAvailExtendedVirtual;
75 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
78 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
80 /* Return the total amount of physical memory. */
84 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
85 { /* This works on linux-gnu, solaris2 and cygwin. */
86 double pages = sysconf (_SC_PHYS_PAGES);
87 double pagesize = sysconf (_SC_PAGESIZE);
88 if (0 <= pages && 0 <= pagesize)
89 return pages * pagesize;
93 #if HAVE_PSTAT_GETSTATIC
94 { /* This works on hpux11. */
95 struct pst_static pss;
96 if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
98 double pages = pss.physical_memory;
99 double pagesize = pss.page_size;
100 if (0 <= pages && 0 <= pagesize)
101 return pages * pagesize;
106 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
107 { /* This works on irix6. */
108 struct rminfo realmem;
109 if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
111 double pagesize = sysconf (_SC_PAGESIZE);
112 double pages = realmem.physmem;
113 if (0 <= pages && 0 <= pagesize)
114 return pages * pagesize;
119 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
120 { /* This works on Tru64 UNIX V4/5. */
123 if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
124 NULL, NULL, NULL) == 1)
126 double kbytes = physmem;
129 return kbytes * 1024.0;
134 #if HAVE_SYSCTL && defined HW_PHYSMEM
135 { /* This works on *bsd and darwin. */
136 unsigned int physmem;
137 size_t len = sizeof physmem;
138 static int mib[2] = { CTL_HW, HW_PHYSMEM };
140 if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
141 && len == sizeof (physmem))
142 return (double) physmem;
146 #if HAVE__SYSTEM_CONFIGURATION
147 /* This works on AIX. */
148 return _system_configuration.physmem;
152 { /* this works on windows */
154 HMODULE h = GetModuleHandle ("kernel32.dll");
159 /* Use GlobalMemoryStatusEx if available. */
160 if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
162 lMEMORYSTATUSEX lms_ex;
163 lms_ex.dwLength = sizeof lms_ex;
164 if (!pfnex (&lms_ex))
166 return (double) lms_ex.ullTotalPhys;
169 /* Fall back to GlobalMemoryStatus which is always available.
170 but returns wrong results for physical memory > 4GB. */
174 GlobalMemoryStatus (&ms);
175 return (double) ms.dwTotalPhys;
180 /* Guess 64 MB. It's probably an older host, so guess small. */
181 return 64 * 1024 * 1024;
184 /* Return the amount of physical memory available. */
186 physmem_available (void)
188 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
189 { /* This works on linux-gnu, solaris2 and cygwin. */
190 double pages = sysconf (_SC_AVPHYS_PAGES);
191 double pagesize = sysconf (_SC_PAGESIZE);
192 if (0 <= pages && 0 <= pagesize)
193 return pages * pagesize;
197 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
198 { /* This works on hpux11. */
199 struct pst_static pss;
200 struct pst_dynamic psd;
201 if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
202 && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
204 double pages = psd.psd_free;
205 double pagesize = pss.page_size;
206 if (0 <= pages && 0 <= pagesize)
207 return pages * pagesize;
212 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
213 { /* This works on irix6. */
214 struct rminfo realmem;
215 if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
217 double pagesize = sysconf (_SC_PAGESIZE);
218 double pages = realmem.availrmem;
219 if (0 <= pages && 0 <= pagesize)
220 return pages * pagesize;
225 #if HAVE_TABLE && defined TBL_VMSTATS
226 { /* This works on Tru64 UNIX V4/5. */
227 struct tbl_vmstats vmstats;
229 if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
231 double pages = vmstats.free_count;
232 double pagesize = vmstats.pagesize;
234 if (0 <= pages && 0 <= pagesize)
235 return pages * pagesize;
240 #if HAVE_SYSCTL && defined HW_USERMEM
241 { /* This works on *bsd and darwin. */
242 unsigned int usermem;
243 size_t len = sizeof usermem;
244 static int mib[2] = { CTL_HW, HW_USERMEM };
246 if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
247 && len == sizeof (usermem))
248 return (double) usermem;
253 { /* this works on windows */
255 HMODULE h = GetModuleHandle ("kernel32.dll");
260 /* Use GlobalMemoryStatusEx if available. */
261 if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
263 lMEMORYSTATUSEX lms_ex;
264 lms_ex.dwLength = sizeof lms_ex;
265 if (!pfnex (&lms_ex))
267 return (double) lms_ex.ullAvailPhys;
270 /* Fall back to GlobalMemoryStatus which is always available.
271 but returns wrong results for physical memory > 4GB */
275 GlobalMemoryStatus (&ms);
276 return (double) ms.dwAvailPhys;
281 /* Guess 25% of physical memory. */
282 return physmem_total () / 4;
294 printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
302 compile-command: "gcc -DDEBUG -g -O -Wall -W physmem.c"