lib/getpagesize.h

   1 /* Emulate getpagesize on systems that lack it.  */
   2
   3 #ifndef HAVE_GETPAGESIZE
   4
   5 #ifdef HAVE_UNISTD_H
   6 # include <unistd.h>
   7 #endif
   8
   9 #if !defined getpagesize && defined _SC_PAGESIZE
  10 # if !(defined VMS && __VMS_VER < 70000000)
  11 #  define getpagesize() sysconf (_SC_PAGESIZE)
  12 # endif
  13 #endif
  14
  15 #if !defined getpagesize && defined VMS
  16 # ifdef __ALPHA
  17 #  define getpagesize() 8192
  18 # else
  19 #  define getpagesize() 512
  20 # endif
  21 #endif
  22
  23 /* This is for BeOS.  */
  24 #if !defined getpagesize && HAVE_OS_H
  25 # include <OS.h>
  26 # if defined B_PAGE_SIZE
  27 #  define getpagesize() B_PAGE_SIZE
  28 # endif
  29 #endif
  30
  31 #ifndef getpagesize
  32 # include <sys/param.h>
  33 # ifdef EXEC_PAGESIZE
  34 #  define getpagesize() EXEC_PAGESIZE
  35 # else
  36 #  ifdef NBPG
  37 #   ifndef CLSIZE
  38 #    define CLSIZE 1
  39 #   endif
  40 #   define getpagesize() (NBPG * CLSIZE)
  41 #  else
  42 #   ifdef NBPC
  43 #    define getpagesize() NBPC
  44 #   endif
  45 #  endif
  46 # endif
  47 #endif
  48
  49 #endif /* not HAVE_GETPAGESIZE */