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4938384a DD |
1 | /* Calculate the size of physical memory. |
2 | Copyright 2000, 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 | /* Return the total amount of physical memory. */ | |
33 | double | |
900d2082 | 34 | physmem_total () |
4938384a DD |
35 | { |
36 | #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE | |
37 | { | |
38 | double pages = sysconf (_SC_PHYS_PAGES); | |
39 | double pagesize = sysconf (_SC_PAGESIZE); | |
40 | if (0 <= pages && 0 <= pagesize) | |
41 | return pages * pagesize; | |
42 | } | |
43 | #endif | |
44 | ||
45 | #if HAVE_PSTAT_GETSTATIC | |
46 | { | |
47 | struct pst_static pss; | |
48 | if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)) | |
49 | { | |
50 | double pages = pss.physical_memory; | |
51 | double pagesize = pss.page_size; | |
52 | if (0 <= pages && 0 <= pagesize) | |
53 | return pages * pagesize; | |
54 | } | |
55 | } | |
56 | #endif | |
57 | ||
58 | /* Return 0 if we can't determine the value. */ | |
59 | return 0; | |
60 | } | |
61 | ||
62 | /* Return the amount of physical memory available. */ | |
63 | double | |
900d2082 | 64 | physmem_available () |
4938384a DD |
65 | { |
66 | #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE | |
67 | { | |
68 | double pages = sysconf (_SC_AVPHYS_PAGES); | |
69 | double pagesize = sysconf (_SC_PAGESIZE); | |
70 | if (0 <= pages && 0 <= pagesize) | |
71 | return pages * pagesize; | |
72 | } | |
73 | #endif | |
74 | ||
75 | #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC | |
76 | { | |
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)) | |
81 | { | |
82 | double pages = psd.psd_free; | |
83 | double pagesize = pss.page_size; | |
84 | if (0 <= pages && 0 <= pagesize) | |
85 | return pages * pagesize; | |
86 | } | |
87 | } | |
88 | #endif | |
89 | ||
90 | /* Guess 25% of physical memory. */ | |
91 | return physmem_total () / 4; | |
92 | } |