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93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
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/* Calculate the size of physical memory.
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Paul Eggert. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_SYS_PSTAT_H
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# include <sys/pstat.h>
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#endif
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/* Return the total amount of physical memory. */
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double
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physmem_total (void)
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{
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#if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
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{
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double pages = sysconf (_SC_PHYS_PAGES);
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double pagesize = sysconf (_SC_PAGESIZE);
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if (0 <= pages && 0 <= pagesize)
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return pages * pagesize;
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}
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#endif
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#if HAVE_PSTAT_GETSTATIC
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{
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struct pst_static pss;
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if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
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{
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double pages = pss.physical_memory;
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double pagesize = pss.page_size;
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if (0 <= pages && 0 <= pagesize)
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return pages * pagesize;
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}
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}
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#endif
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/* Return 0 if we can't determine the value. */
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return 0;
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}
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/* Return the amount of physical memory available. */
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double
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physmem_available (void)
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{
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#if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
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{
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double pages = sysconf (_SC_AVPHYS_PAGES);
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double pagesize = sysconf (_SC_PAGESIZE);
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if (0 <= pages && 0 <= pagesize)
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return pages * pagesize;
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}
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#endif
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#if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
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{
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struct pst_static pss;
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struct pst_dynamic psd;
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if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
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&& 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
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{
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double pages = psd.psd_free;
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double pagesize = pss.page_size;
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if (0 <= pages && 0 <= pagesize)
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return pages * pagesize;
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}
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}
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#endif
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/* Guess 25% of physical memory. */
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return physmem_total () / 4;
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}
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