| # |
| # 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_SAVE |
| AC_LANG_C |
| AC_TRY_RUN([ |
| #ifdef HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #ifdef HAVE_SYS_MMAN_H |
| #include <sys/mman.h> |
| #endif |
| |
| #ifdef HAVE_FCNTL_H |
| #include <fcntl.h> |
| #endif |
| |
| int fd; |
| int main () { |
| 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_LANG_RESTORE |
| ]) |
| 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 |
| ]) |