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 #ifdef HAVE_SYS_TYPES_H
11 #include <sys/types.h>
14 #ifdef HAVE_SYS_MMAN_H
24 fd = creat ("foo",0777); fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0); unlink ("foo"); return (fd != (int) MAP_FAILED);}],
25 ac_cv_func_mmap_file=yes, ac_cv_func_mmap_file=no)
28 if test "$ac_cv_func_mmap_file" = yes; then
29 AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
30 AC_SUBST(MMAP_FILE,[yes])