2 # Check for the ability to mmap a file.
4 AC_DEFUN([AC_FUNC_MMAP_FILE],
5 [AC_CACHE_CHECK(for mmap of files,
10 #include <sys/types.h>
16 fd = creat ("foo",0777);
17 fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0);
19 return (fd != (int) MAP_FAILED);}]])],
20 [ac_cv_func_mmap_file=yes], [ac_cv_func_mmap_file=no],[])
23 if test "$ac_cv_func_mmap_file" = yes; then
24 AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
25 AC_SUBST(MMAP_FILE,[yes])