+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);
+