gnu/usr.bin/grep/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
  16
  17 #include <sys/param.h>
  18
  19 #ifdef EXEC_PAGESIZE
  20 #define getpagesize() EXEC_PAGESIZE
  21 #else
  22 #ifdef NBPG
  23 #define getpagesize() NBPG * CLSIZE
  24 #ifndef CLSIZE
  25 #define CLSIZE 1
  26 #endif /* no CLSIZE */
  27 #else /* no NBPG */
  28 #ifdef NBPC
  29 #define getpagesize() NBPC
  30 #endif /* NBPC */
  31 #endif /* no NBPG */
  32 #endif /* no EXEC_PAGESIZE */
  33 #endif /* no _SC_PAGESIZE */
  34
  35 #endif /* not HAVE_GETPAGESIZE */