-#serial 1
+#serial 10
dnl Find out how to get the file descriptor associated with an open DIR*.
+
+# Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
dnl From Jim Meyering
-AC_DEFUN([UTILS_FUNC_DIRFD],
+AC_DEFUN([gl_FUNC_DIRFD],
[
- AC_REPLACE_FUNCS([dirfd])
- AC_CHECK_DECLS([dirfd])
- if test $ac_cv_func_dirfd = no; then
+ AC_LIBSOURCES([dirfd.c, dirfd.h])
+
+ dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
+ AC_REQUIRE([AC_PROG_CPP])
+ AC_REQUIRE([AC_PROG_EGREP])
+
+ AC_HEADER_DIRENT
+ dirfd_headers='
+#if HAVE_DIRENT_H
+# include <dirent.h>
+#else /* not HAVE_DIRENT_H */
+# define dirent direct
+# if HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif /* HAVE_SYS_NDIR_H */
+# if HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif /* HAVE_SYS_DIR_H */
+# if HAVE_NDIR_H
+# include <ndir.h>
+# endif /* HAVE_NDIR_H */
+#endif /* HAVE_DIRENT_H */
+'
+ AC_CHECK_FUNCS(dirfd)
+ AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
+
+ AC_CACHE_CHECK([whether dirfd is a macro],
+ gl_cv_func_dirfd_macro,
+ [AC_EGREP_CPP([dirent_header_defines_dirfd], [$dirfd_headers
+#ifdef dirfd
+ dirent_header_defines_dirfd
+#endif],
+ gl_cv_func_dirfd_macro=yes,
+ gl_cv_func_dirfd_macro=no)])
+
+ # Use the replacement only if we have no function, macro,
+ # or declaration with that name.
+ if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd,$gl_cv_func_dirfd_macro \
+ = no,no,no; then
+ AC_REPLACE_FUNCS([dirfd])
AC_CACHE_CHECK(
[how to get the file descriptor associated with an open DIR*],
- ac_cv_sys_dir_to_fd,
+ gl_cv_sys_dir_fd_member_name,
[
- dirfd_save_DEFS=$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=$ac_expr"
+ dirfd_save_CFLAGS=$CFLAGS
+ for ac_expr in d_fd dd_fd; do
+
+ CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
AC_TRY_COMPILE(
- [#include <sys/types.h>
- #include <dirent.h>
+ [$dirfd_headers
],
- [DIR *dir_p = opendir("."); (void) ($ac_expr);],
- dir_fd_done=yes
+ [DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
+ dir_fd_found=yes
)
- DEFS=$dirfd_save_DEFS
- test "$dir_fd_done" = yes && break
+ CFLAGS=$dirfd_save_CFLAGS
+ test "$dir_fd_found" = yes && break
done
+ test "$dir_fd_found" = yes || ac_expr=no_such_member
- ac_cv_sys_dir_to_fd=$ac_expr
+ gl_cv_sys_dir_fd_member_name=$ac_expr
]
)
- AC_DEFINE_UNQUOTED(DIR_TO_FD,
- $ac_cv_sys_dir_to_fd,
- [the file descriptor associated with `dir_p'])
+ if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
+ AC_DEFINE_UNQUOTED(DIR_FD_MEMBER_NAME,
+ $gl_cv_sys_dir_fd_member_name,
+ [the name of the file descriptor member of DIR])
+ fi
+ AH_VERBATIM(DIR_TO_FD,
+ [#ifdef DIR_FD_MEMBER_NAME
+# define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME)
+#else
+# define DIR_TO_FD(Dir_p) -1
+#endif
+])
fi
])