smdb_unlock_file
extern int smdb_unlock_file __P((int));
(void) smdb_unlock_file(lock_fd);
(void) smdb_unlock_file(db1->smdb1_lock_fd);
smdb_unlock_file(lock_fd);
smdb_unlock_file(db2->smdb2_lock_fd);
smdb_unlock_file(db->smndbm_lock_fd);