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#serial 5
dnl Find out how to get the file descriptor associated with an open DIR*.
dnl From Jim Meyering
AC_DEFUN([UTILS_FUNC_DIRFD],
[
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], , , $dirfd_headers)
AC_CACHE_CHECK([whether dirfd is a macro],
jm_cv_func_dirfd_macro,
AC_EGREP_CPP([dirent_header_defines_dirfd], [$dirfd_headers
#ifdef dirfd
dirent_header_defines_dirfd
#endif],
jm_cv_func_dirfd_macro=yes,
jm_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,$jm_cv_func_dirfd_macro \
= no,no,no; then
AC_REPLACE_FUNCS([dirfd])
AC_CACHE_CHECK(
[how to get the file descriptor associated with an open DIR*],
gl_cv_sys_dir_fd_member_name,
[
dirfd_save_CFLAGS=$CFLAGS
for ac_expr in d_fd dd_fd; do
CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
AC_TRY_COMPILE(
[$dirfd_headers
],
[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
dir_fd_found=yes
)
CFLAGS=$dirfd_save_CFLAGS
test "$dir_fd_found" = yes && break
done
test "$dir_fd_found" = yes || ac_expr=no_such_member
gl_cv_sys_dir_fd_member_name=$ac_expr
]
)
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
])
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