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authorDJ Delorie <dj@redhat.com>2003-02-21 01:35:29 +0000
committerDJ Delorie <dj@redhat.com>2003-02-21 01:35:29 +0000
commit4938384a1f22b28db51c5a483c4b5a4e0405be21 (patch)
tree3ea1195322b8ca962fe8d00e8be84782cc5c92d6 /libiberty/physmem.c
parent66491ebcb711ba361449716c3526f6d26333612f (diff)
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+/* Calculate the size of physical memory.
+ Copyright 2000, 2001 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by Paul Eggert. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if HAVE_SYS_PSTAT_H
+# include <sys/pstat.h>
+#endif
+
+/* Return the total amount of physical memory. */
+double
+physmem_total (void)
+{
+#if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
+ {
+ double pages = sysconf (_SC_PHYS_PAGES);
+ double pagesize = sysconf (_SC_PAGESIZE);
+ if (0 <= pages && 0 <= pagesize)
+ return pages * pagesize;
+ }
+#endif
+
+#if HAVE_PSTAT_GETSTATIC
+ {
+ struct pst_static pss;
+ if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
+ {
+ double pages = pss.physical_memory;
+ double pagesize = pss.page_size;
+ if (0 <= pages && 0 <= pagesize)
+ return pages * pagesize;
+ }
+ }
+#endif
+
+ /* Return 0 if we can't determine the value. */
+ return 0;
+}
+
+/* Return the amount of physical memory available. */
+double
+physmem_available (void)
+{
+#if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
+ {
+ double pages = sysconf (_SC_AVPHYS_PAGES);
+ double pagesize = sysconf (_SC_PAGESIZE);
+ if (0 <= pages && 0 <= pagesize)
+ return pages * pagesize;
+ }
+#endif
+
+#if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
+ {
+ struct pst_static pss;
+ struct pst_dynamic psd;
+ if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
+ && 0 <= pstat_getdynamic (&psd, sizeof psd, 1, 0))
+ {
+ double pages = psd.psd_free;
+ double pagesize = pss.page_size;
+ if (0 <= pages && 0 <= pagesize)
+ return pages * pagesize;
+ }
+ }
+#endif
+
+ /* Guess 25% of physical memory. */
+ return physmem_total () / 4;
+}