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2 files changed, 77 insertions, 0 deletions

diff --git a/lib/physmem.c b/lib/physmem.c
new file mode 100644
index 000000000..d0e252f1e
--- /dev/null
+++ b/lib/physmem.c
@@ -0,0 +1,58 @@
+/* Calculate the size of physical memory.
+   Copyright 2000 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
+
+#include "physmem.h"
+
+#if HAVE_UNISTD_H
+# include <unistd.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
+
+  /* Guess 64 MB.  It's probably an older host, so guess small.  */
+  return 64 * 1024 * 1024;
+}
+
+/* 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
+
+  /* Guess 25% of physical memory.  */
+  return physmem_total () / 4;
+}
diff --git a/lib/physmem.h b/lib/physmem.h
new file mode 100644
index 000000000..d9a98096f
--- /dev/null
+++ b/lib/physmem.h
@@ -0,0 +1,19 @@
+#ifndef PHYSMEM_H_
+# define PHYSMEM_H_ 1
+
+# if HAVE_CONFIG_H
+#  include <config.h>
+# endif
+
+# ifndef PARAMS
+#  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#   define PARAMS(Args) Args
+#  else
+#   define PARAMS(Args) ()
+#  endif
+# endif
+
+double physmem_total PARAMS ((void));
+double physmem_available PARAMS ((void));
+
+#endif /* PHYSMEM_H_ */