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#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 <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_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
])
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