+int dir_is_empty(const char *path);
+
+void rename_process(const char name[8]);
+
+void sigset_add_many(sigset_t *ss, ...);
+
+char* gethostname_malloc(void);
+char* getlogname_malloc(void);
+int getttyname_malloc(char **r);
+int getmachineid_malloc(char **r);
+
+int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
+
+int rm_rf(const char *path, bool only_dirs, bool delete_root);