[Bug-gnulib] physmem.c merge from coreutils, with one minor change.

[Paul Eggert]

I installed ihe following change, which updates physmem.c to match
coreutils, except it includes physmem.h first.

2003-08-14  Jim Meyering  <address@hidden>
        and Paul Eggert  <address@hidden>

        * physmem.c: Merge in portability changes from gcc/libiberty
        to support AIX, IRIX, Tru64, and Windows.  See the ChangeLog there
        for credits and details.  Thanks to Kaveh Ghazi for helping
        to keep these files in sync.
        (ARRAY_SIZE): Define it.
        (physmem_total, physmem_available): Add comments. From Kaveh Ghazi.

--- physmem.c.~1.2.~    Fri Nov 16 01:20:25 2001
+++ physmem.c   Thu Aug 14 20:17:18 2003
@@ -1,5 +1,5 @@
 /* Calculate the size of physical memory.
-   Copyright 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2001, 2003 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
@@ -31,12 +31,61 @@
 # include <sys/pstat.h>
 #endif
 
+#if HAVE_SYS_SYSMP_H
+# include <sys/sysmp.h>
+#endif
+
+#if HAVE_SYS_SYSINFO_H && HAVE_MACHINE_HAL_SYSINFO_H
+# include <sys/sysinfo.h>
+# include <machine/hal_sysinfo.h>
+#endif
+
+#if HAVE_SYS_TABLE_H
+# include <sys/table.h>
+#endif
+
+#include <sys/types.h>
+
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+
+#if HAVE_SYS_SYSCTL_H
+# include <sys/sysctl.h>
+#endif
+
+#if HAVE_SYS_SYSTEMCFG_H
+# include <sys/systemcfg.h>
+#endif
+
+#ifdef _WIN32
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+/*  MEMORYSTATUSEX is missing from older windows headers, so define
+    a local replacement.  */
+typedef struct
+{
+  DWORD dwLength;
+  DWORD dwMemoryLoad;
+  DWORDLONG ullTotalPhys;
+  DWORDLONG ullAvailPhys;
+  DWORDLONG ullTotalPageFile;
+  DWORDLONG ullAvailPageFile;
+  DWORDLONG ullTotalVirtual;
+  DWORDLONG ullAvailVirtual;
+  DWORDLONG ullAvailExtendedVirtual;
+} lMEMORYSTATUSEX;
+typedef WINBOOL (WINAPI *PFN_MS_EX) (lMEMORYSTATUSEX*);
+#endif
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+
 /* Return the total amount of physical memory.  */
 double
-physmem_total (void)
+physmem_total ()
 {
 #if defined _SC_PHYS_PAGES && defined _SC_PAGESIZE
-  {
+  { /* This works on linux-gnu, solaris2 and cygwin.  */
     double pages = sysconf (_SC_PHYS_PAGES);
     double pagesize = sysconf (_SC_PAGESIZE);
     if (0 <= pages && 0 <= pagesize)
@@ -45,7 +94,7 @@ physmem_total (void)
 #endif
 
 #if HAVE_PSTAT_GETSTATIC
-  {
+  { /* This works on hpux11.  */
     struct pst_static pss;
     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0))
       {
@@ -57,16 +106,90 @@ physmem_total (void)
   }
 #endif
 
+#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined 
_SC_PAGESIZE
+  { /* This works on irix6. */
+    struct rminfo realmem;
+    if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
+      {
+       double pagesize = sysconf (_SC_PAGESIZE);
+       double pages = realmem.physmem;
+       if (0 <= pages && 0 <= pagesize)
+         return pages * pagesize;
+      }
+  }
+#endif
+
+#if HAVE_GETSYSINFO && defined GSI_PHYSMEM
+  { /* This works on Tru64 UNIX V4/5.  */
+    int physmem;
+
+    if (getsysinfo (GSI_PHYSMEM, (caddr_t) &physmem, sizeof (physmem),
+                   NULL, NULL, NULL) == 1)
+      {
+       double kbytes = physmem;
+
+       if (0 <= kbytes)
+         return kbytes * 1024.0;
+      }
+  }
+#endif
+
+#if HAVE_SYSCTL && defined HW_PHYSMEM
+  { /* This works on *bsd and darwin.  */
+    unsigned int physmem;
+    size_t len = sizeof physmem;
+    static int mib[2] = { CTL_HW, HW_PHYSMEM };
+
+    if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
+       && len == sizeof (physmem))
+      return (double) physmem;
+  }
+#endif
+
+#if HAVE__SYSTEM_CONFIGURATION
+  /* This works on AIX.  */
+  return _system_configuration.physmem;
+#endif
+
+#if defined _WIN32
+  { /* this works on windows */
+    PFN_MS_EX pfnex;
+    HMODULE h = GetModuleHandle ("kernel32.dll");
+
+    if (!h)
+      return 0.0;
+
+    /*  Use GlobalMemoryStatusEx if available.  */
+    if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
+      {
+       lMEMORYSTATUSEX lms_ex;
+       lms_ex.dwLength = sizeof lms_ex;
+       if (!pfnex (&lms_ex))
+         return 0.0;
+       return (double) lms_ex.ullTotalPhys;
+      }
+
+    /*  Fall back to GlobalMemoryStatus which is always available.
+        but returns wrong results for physical memory > 4GB.  */
+    else
+      {
+       MEMORYSTATUS ms;
+       GlobalMemoryStatus (&ms);
+       return (double) ms.dwTotalPhys;
+      }
+  }
+#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)
+physmem_available ()
 {
 #if defined _SC_AVPHYS_PAGES && defined _SC_PAGESIZE
-  {
+  { /* This works on linux-gnu, solaris2 and cygwin.  */
     double pages = sysconf (_SC_AVPHYS_PAGES);
     double pagesize = sysconf (_SC_PAGESIZE);
     if (0 <= pages && 0 <= pagesize)
@@ -75,7 +198,7 @@ physmem_available (void)
 #endif
 
 #if HAVE_PSTAT_GETSTATIC && HAVE_PSTAT_GETDYNAMIC
-  {
+  { /* This works on hpux11.  */
     struct pst_static pss;
     struct pst_dynamic psd;
     if (0 <= pstat_getstatic (&pss, sizeof pss, 1, 0)
@@ -89,6 +212,96 @@ physmem_available (void)
   }
 #endif
 
+#if HAVE_SYSMP && defined MP_SAGET && defined MPSA_RMINFO && defined 
_SC_PAGESIZE
+  { /* This works on irix6. */
+    struct rminfo realmem;
+    if (sysmp (MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0)
+      {
+       double pagesize = sysconf (_SC_PAGESIZE);
+       double pages = realmem.availrmem;
+       if (0 <= pages && 0 <= pagesize)
+         return pages * pagesize;
+      }
+  }
+#endif
+
+#if HAVE_TABLE && defined TBL_VMSTATS
+  { /* This works on Tru64 UNIX V4/5.  */
+    struct tbl_vmstats vmstats;
+
+    if (table (TBL_VMSTATS, 0, &vmstats, 1, sizeof (vmstats)) == 1)
+      {
+       double pages = vmstats.free_count;
+       double pagesize = vmstats.pagesize;
+
+       if (0 <= pages && 0 <= pagesize)
+         return pages * pagesize;
+      }
+  }
+#endif
+
+#if HAVE_SYSCTL && defined HW_USERMEM
+  { /* This works on *bsd and darwin.  */
+    unsigned int usermem;
+    size_t len = sizeof usermem;
+    static int mib[2] = { CTL_HW, HW_USERMEM };
+
+    if (sysctl (mib, ARRAY_SIZE (mib), &usermem, &len, NULL, 0) == 0
+       && len == sizeof (usermem))
+      return (double) usermem;
+  }
+#endif
+
+#if defined _WIN32
+  { /* this works on windows */
+    PFN_MS_EX pfnex;
+    HMODULE h = GetModuleHandle ("kernel32.dll");
+
+    if (!h)
+      return 0.0;
+
+    /*  Use GlobalMemoryStatusEx if available.  */
+    if ((pfnex = (PFN_MS_EX) GetProcAddress (h, "GlobalMemoryStatusEx")))
+      {
+       lMEMORYSTATUSEX lms_ex;
+       lms_ex.dwLength = sizeof lms_ex;
+       if (!pfnex (&lms_ex))
+         return 0.0;
+       return (double) lms_ex.ullAvailPhys;
+      }
+
+    /*  Fall back to GlobalMemoryStatus which is always available.
+        but returns wrong results for physical memory > 4GB  */
+    else
+      {
+       MEMORYSTATUS ms;
+       GlobalMemoryStatus (&ms);
+       return (double) ms.dwAvailPhys;
+      }
+  }
+#endif
+
   /* Guess 25% of physical memory.  */
   return physmem_total () / 4;
 }
+
+
+#if DEBUG
+
+# include <stdio.h>
+# include <stdlib.h>
+
+int
+main ()
+{
+  printf ("%12.f %12.f\n", physmem_total (), physmem_available ());
+  exit (0);
+}
+
+#endif /* DEBUG */
+
+/*
+Local Variables:
+compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W physmem.c"
+End:
+*/