src/getpagesize.h

   1 /* Emulate getpagesize on systems that lack it.  */
   2
   3 #ifndef HAVE_GETPAGESIZE
   4
   5 # ifdef VMS
   6 #  define getpagesize() 512
   7 # endif
   8
   9 # ifdef HAVE_UNISTD_H
  10 #  include <unistd.h>
  11 # endif
  12
  13 # ifdef _SC_PAGESIZE
  14 #  define getpagesize() sysconf(_SC_PAGESIZE)
  15 # else /* no _SC_PAGESIZE */
  16 #  ifdef HAVE_SYS_PARAM_H
  17 #   include <sys/param.h>
  18 #   ifdef EXEC_PAGESIZE
  19 #    define getpagesize() EXEC_PAGESIZE
  20 #   else /* no EXEC_PAGESIZE */
  21 #    ifdef NBPG
  22 #     define getpagesize() NBPG * CLSIZE
  23 #     ifndef CLSIZE
  24 #      define CLSIZE 1
  25 #     endif /* no CLSIZE */
  26 #    else /* no NBPG */
  27 #     ifdef NBPC
  28 #      define getpagesize() NBPC
  29 #     else /* no NBPC */
  30 #      ifdef PAGESIZE
  31 #       define getpagesize() PAGESIZE
  32 #      endif /* PAGESIZE */
  33 #     endif /* no NBPC */
  34 #    endif /* no NBPG */
  35 #   endif /* no EXEC_PAGESIZE */
  36 #  else /* no HAVE_SYS_PARAM_H */
  37 #   define getpagesize() 8192   /* punt totally */
  38 #  endif /* no HAVE_SYS_PARAM_H */
  39 # endif /* no _SC_PAGESIZE */
  40
  41 #endif /* no HAVE_GETPAGESIZE */