spool_directory, message_subdir, message_id);
dk_fd = Uopen(dk_spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
if (dk_fd < 0)
spool_directory, message_subdir, message_id);
dk_fd = Uopen(dk_spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
if (dk_fd < 0)