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3064
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1 /* Calculate the size of physical memory. |
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2 Copyright 2000 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software Foundation, |
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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17 |
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18 /* Written by Paul Eggert. */ |
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19 |
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20 #if HAVE_CONFIG_H |
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21 # include <config.h> |
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22 #endif |
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23 |
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24 #include "physmem.h" |
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25 |
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26 #if HAVE_UNISTD_H |
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27 # include <unistd.h> |
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28 #endif |
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29 |
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30 /* Return the total amount of physical memory. */ |
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31 double |
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32 physmem_total (void) |
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33 { |
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34 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE |
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35 double pages = sysconf (_SC_PHYS_PAGES); |
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36 double pagesize = sysconf (_SC_PAGESIZE); |
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37 if (0 <= pages && 0 <= pagesize) |
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38 return pages * pagesize; |
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39 #endif |
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40 |
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41 /* Guess 64 MB. It's probably an older host, so guess small. */ |
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42 return 64 * 1024 * 1024; |
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43 } |
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44 |
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45 /* Return the amount of physical memory available. */ |
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46 double |
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47 physmem_available (void) |
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48 { |
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49 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE |
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50 double pages = sysconf (_SC_AVPHYS_PAGES); |
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51 double pagesize = sysconf (_SC_PAGESIZE); |
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52 if (0 <= pages && 0 <= pagesize) |
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53 return pages * pagesize; |
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54 #endif |
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55 |
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56 /* Guess 25% of physical memory. */ |
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57 return physmem_total () / 4; |
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58 } |
