| # | |
| # 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 | |
| ]) |