1 /* Calculate the size of physical memory.
2 Copyright (C) 2000-2023 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 */