1 /* Calculate the size of physical memory.
2 Copyright 2000, 2001 Free Software Foundation, Inc.
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)
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.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Paul Eggert. */
29 # include <sys/pstat.h>
32 /* Return the total amount of physical memory. */
36 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
38 double pages
= sysconf (_SC_PHYS_PAGES
);
39 double pagesize
= sysconf (_SC_PAGESIZE
);
40 if (0 <= pages
&& 0 <= pagesize
)
41 return pages
* pagesize
;
45 #if HAVE_PSTAT_GETSTATIC
47 struct pst_static pss
;
48 if (0 <= pstat_getstatic (&pss
, sizeof pss
, 1, 0))
50 double pages
= pss
.physical_memory
;
51 double pagesize
= pss
.page_size
;
52 if (0 <= pages
&& 0 <= pagesize
)
53 return pages
* pagesize
;
58 /* Return 0 if we can't determine the value. */
62 /* Return the amount of physical memory available. */
66 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
68 double pages
= sysconf (_SC_AVPHYS_PAGES
);
69 double pagesize
= sysconf (_SC_PAGESIZE
);
70 if (0 <= pages
&& 0 <= pagesize
)
71 return pages
* pagesize
;
75 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
77 struct pst_static pss
;
78 struct pst_dynamic psd
;
79 if (0 <= pstat_getstatic (&pss
, sizeof pss
, 1, 0)
80 && 0 <= pstat_getdynamic (&psd
, sizeof psd
, 1, 0))
82 double pages
= psd
.psd_free
;
83 double pagesize
= pss
.page_size
;
84 if (0 <= pages
&& 0 <= pagesize
)
85 return pages
* pagesize
;
90 /* Guess 25% of physical memory. */
91 return physmem_total () / 4;
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