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.  */
64typedef 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;
76typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
77#endif
78
79#include "libiberty.h"
80
81/* Return the total amount of physical memory.  */
82double
83physmem_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.  */
186double
187physmem_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
292int
293main (void)
294{
295  printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
296  exit (0);
297}
298
299#endif /* DEBUG */
300
301/*
302Local Variables:
303compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
304End:
305*/
306