#serial 1 dnl Find out how to get the file descriptor associated with an open DIR*. dnl From Jim Meyering AC_DEFUN([UTILS_FUNC_DIRFD], [ AC_HEADER_DIRENT AC_REPLACE_FUNCS([dirfd]) dirfd_headers=' #if HAVE_DIRENT_H # include #else /* not HAVE_DIRENT_H */ # define dirent direct # if HAVE_SYS_NDIR_H # include # endif /* HAVE_SYS_NDIR_H */ # if HAVE_SYS_DIR_H # include # endif /* HAVE_SYS_DIR_H */ # if HAVE_NDIR_H # include # endif /* HAVE_NDIR_H */ #endif /* HAVE_DIRENT_H */ ' AC_CHECK_DECLS([dirfd], , , $dirfd_headers) if test $ac_cv_func_dirfd = no; then AC_CACHE_CHECK( [how to get the file descriptor associated with an open DIR*], ac_cv_sys_dir_to_fd, [ dirfd_save_DEFS=$DEFS for ac_expr in \ \ '# Solaris' \ 'dir_p->d_fd' \ \ '# Solaris' \ 'dir_p->dd_fd' \ \ '# systems for which the info is not available' \ -1 \ ; do # Skip each embedded comment. case "$ac_expr" in '#'*) continue;; esac DEFS="$DEFS -DDIR_TO_FD=$ac_expr" AC_TRY_COMPILE( [$dirfd_headers ], [DIR *dir_p = opendir("."); (void) ($ac_expr);], dir_fd_done=yes ) DEFS=$dirfd_save_DEFS test "$dir_fd_done" = yes && break done ac_cv_sys_dir_to_fd=$ac_expr ] ) AC_DEFINE_UNQUOTED(DIR_TO_FD, $ac_cv_sys_dir_to_fd, [the file descriptor associated with `dir_p']) fi ])