1 /* Calculate the size of physical memory.
2    Copyright 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
3 
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 2, or (at your option)
7    any later version.
8 
9    This program is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12    GNU General Public License for more details.
13 
14    You should have received a copy of the GNU General Public License
15    along with this program; if not, write to the Free Software Foundation,
16    Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
17 
18 /* Written by Paul Eggert.  */
19 
20 #if HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23 
24 #if HAVE_UNISTD_H
25 # include <unistd.h>
26 #endif
27 
28 #if HAVE_SYS_PSTAT_H
29 # include <sys/pstat.h>
30 #endif
31 
32 #if HAVE_SYS_SYSMP_H
33 # include <sys/sysmp.h>
34 #endif
35 
36 #if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
37 # include <sys/sysinfo.h>
38 # include <machine/hal_sysinfo.h>
39 #endif
40 
41 #if HAVE_SYS_TABLE_H
42 # include <sys/table.h>
43 #endif
44 
45 #include <sys/types.h>
46 
47 #if HAVE_SYS_PARAM_H
48 # include <sys/param.h>
49 #endif
50 
51 #if HAVE_SYS_SYSCTL_H
52 # include <sys/sysctl.h>
53 #endif
54 
55 #if HAVE_SYS_SYSTEMCFG_H
56 # include <sys/systemcfg.h>
57 #endif
58 
59 #ifdef _WIN32
60 # define WIN32_LEAN_AND_MEAN
61 # include <windows.h>
62 /*  MEMORYSTATUSEX is missing from older windows headers, so define
63     a local replacement.  */
64 typedef struct
65 {
66   DWORD dwLength;
67   DWORD dwMemoryLoad;
68   DWORDLONG ullTotalPhys;
69   DWORDLONG ullAvailPhys;
70   DWORDLONG ullTotalPageFile;
71   DWORDLONG ullAvailPageFile;
72   DWORDLONG ullTotalVirtual;
73   DWORDLONG ullAvailVirtual;
74   DWORDLONG ullAvailExtendedVirtual;
75 } lMEMORYSTATUSEX;
76 typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
77 #endif
78 
79 #include "libiberty.h"
80 
81 /* Return the total amount of physical memory.  */
82 double
83 physmem_total (void)
84 {
85 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
86   { /* This works on linux-gnu, solaris2 and cygwin.  */
87     double pages = sysconf (_SC_PHYS_PAGES);
88     double pagesize = sysconf (_SC_PAGESIZE);
89     if (0 <= pages && 0 <= pagesize)
90       return pages * pagesize;
91   }
92 #endif
93 
94 #if HAVE_PSTAT_GETSTATIC
95   { /* This works on hpux11.  */
96     struct pst_static pss;
97     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
98       {
99 	double pages = pss.physical_memory;
100 	double pagesize = pss.page_size;
101 	if (0 <= pages && 0 <= pagesize)
102 	  return pages * pagesize;
103       }
104   }
105 #endif
106 
107 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
108   { /* This works on irix6. */
109     struct rminfo realmem;
110     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
111       {
112 	double pagesize = sysconf (_SC_PAGESIZE);
113 	double pages = realmem.physmem;
114 	if (0 <= pages && 0 <= pagesize)
115 	  return pages * pagesize;
116       }
117   }
118 #endif
119 
120 #if HAVE_GETSYSINFO && defined GSI_PHYSMEM
121   { /* This works on Tru64 UNIX V4/5.  */
122     int physmem;
123 
124     if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
125 		    NULL, NULL, NULL) == 1)
126       {
127 	double kbytes = physmem;
128 
129 	if (0 <= kbytes)
130 	  return kbytes * 1024.0;
131       }
132   }
133 #endif
134 
135 #if HAVE_SYSCTL && defined HW_PHYSMEM
136   { /* This works on *bsd and darwin.  */
137     unsigned int physmem;
138     size_t len = sizeof physmem;
139     static int mib[2] = { CTL_HW, HW_PHYSMEM };
140 
141     if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
142 	&& len == sizeof (physmem))
143       return (double) physmem;
144   }
145 #endif
146 
147 #if HAVE__SYSTEM_CONFIGURATION
148   /* This works on AIX 4.3.3+.  */
149   return _system_configuration.physmem;
150 #endif
151 
152 #if defined _WIN32
153   { /* this works on windows */
154     PFN_MS_EX pfnex;
155     HMODULE h = GetModuleHandle ("kernel32.dll");
156 
157     if (!h)
158       return 0.0;
159 
160     /*  Use GlobalMemoryStatusEx if available.  */
161     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
162       {
163 	lMEMORYSTATUSEX lms_ex;
164 	lms_ex.dwLength = sizeof lms_ex;
165 	if (!pfnex (&lms_ex))
166 	  return 0.0;
167 	return (double) lms_ex.ullTotalPhys;
168       }
169 
170     /*  Fall back to GlobalMemoryStatus which is always available.
171         but returns wrong results for physical memory > 4GB.  */
172     else
173       {
174 	MEMORYSTATUS ms;
175 	GlobalMemoryStatus (&ms);
176 	return (double) ms.dwTotalPhys;
177       }
178   }
179 #endif
180 
181   /* Return 0 if we can't determine the value.  */
182   return 0;
183 }
184 
185 /* Return the amount of physical memory available.  */
186 double
187 physmem_available (void)
188 {
189 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
190   { /* This works on linux-gnu, solaris2 and cygwin.  */
191     double pages = sysconf (_SC_AVPHYS_PAGES);
192     double pagesize = sysconf (_SC_PAGESIZE);
193     if (0 <= pages && 0 <= pagesize)
194       return pages * pagesize;
195   }
196 #endif
197 
198 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
199   { /* This works on hpux11.  */
200     struct pst_static pss;
201     struct pst_dynamic psd;
202     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
203 	&& 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
204       {
205 	double pages = psd.psd_free;
206 	double pagesize = pss.page_size;
207 	if (0 <= pages && 0 <= pagesize)
208 	  return pages * pagesize;
209       }
210   }
211 #endif
212 
213 #if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined _SC_PAGESIZE
214   { /* This works on irix6. */
215     struct rminfo realmem;
216     if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
217       {
218 	double pagesize = sysconf (_SC_PAGESIZE);
219 	double pages = realmem.availrmem;
220 	if (0 <= pages && 0 <= pagesize)
221 	  return pages * pagesize;
222       }
223   }
224 #endif
225 
226 #if HAVE_TABLE && defined TBL_VMSTATS
227   { /* This works on Tru64 UNIX V4/5.  */
228     struct tbl_vmstats vmstats;
229 
230     if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
231       {
232 	double pages = vmstats.free_count;
233 	double pagesize = vmstats.pagesize;
234 
235 	if (0 <= pages && 0 <= pagesize)
236 	  return pages * pagesize;
237       }
238   }
239 #endif
240 
241 #if HAVE_SYSCTL && defined HW_USERMEM
242   { /* This works on *bsd and darwin.  */
243     unsigned int usermem;
244     size_t len = sizeof usermem;
245     static int mib[2] = { CTL_HW, HW_USERMEM };
246 
247     if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
248 	&& len == sizeof (usermem))
249       return (double) usermem;
250   }
251 #endif
252 
253 #if defined _WIN32
254   { /* this works on windows */
255     PFN_MS_EX pfnex;
256     HMODULE h = GetModuleHandle ("kernel32.dll");
257 
258     if (!h)
259       return 0.0;
260 
261     /*  Use GlobalMemoryStatusEx if available.  */
262     if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
263       {
264 	lMEMORYSTATUSEX lms_ex;
265 	lms_ex.dwLength = sizeof lms_ex;
266 	if (!pfnex (&lms_ex))
267 	  return 0.0;
268 	return (double) lms_ex.ullAvailPhys;
269       }
270 
271     /*  Fall back to GlobalMemoryStatus which is always available.
272         but returns wrong results for physical memory > 4GB  */
273     else
274       {
275 	MEMORYSTATUS ms;
276 	GlobalMemoryStatus (&ms);
277 	return (double) ms.dwAvailPhys;
278       }
279   }
280 #endif
281 
282   /* Guess 25% of physical memory.  */
283   return physmem_total () / 4;
284 }
285 
286 
287 #if DEBUG
288 
289 # include <stdio.h>
290 # include <stdlib.h>
291 
292 int
293 main (void)
294 {
295   printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
296   exit (0);
297 }
298 
299 #endif /* DEBUG */
300 
301 /*
302 Local Variables:
303 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
304 End:
305 */
306