rem: physmem_total ()
add: physmem_total (void)
context: 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)      return pages * pagesize;  }#endif#if HAVE_PSTAT_GETSTATIC  { /* This works on hpux11.  */    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#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;}