| # |
| # Check for the ability to mmap a file. |
| # |
| AC_DEFUN([AC_FUNC_MMAP_FILE], |
| [AC_CACHE_CHECK(for mmap of files, |
| ac_cv_func_mmap_file, |
| [ AC_LANG_PUSH([C]) |
| AC_RUN_IFELSE([ |
| AC_LANG_PROGRAM([[ |
| #include <sys/types.h> |
| #include <sys/mman.h> |
| #include <fcntl.h> |
| ]],[[ |
| int fd; |
| fd = creat ("foo",0777); |
| fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0); |
| unlink ("foo"); |
| return (fd != (int) MAP_FAILED);]])], |
| [ac_cv_func_mmap_file=yes],[ac_cv_func_mmap_file=no],[ac_cv_func_mmap_file=no]) |
| AC_LANG_POP([C]) |
| ]) |
| if test "$ac_cv_func_mmap_file" = yes; then |
| AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory]) |
| AC_SUBST(MMAP_FILE,[yes]) |
| fi |
| ]) |
