gnu/dist/grep/src/getpagesize.h

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