+char *unquote(const char *s, const char *quotes);
+
+int wait_for_terminate(pid_t pid, siginfo_t *status);
+int wait_for_terminate_and_warn(const char *name, pid_t pid);
+
+_noreturn_ void freeze(void);
+
+bool null_or_empty(struct stat *st);
+
+DIR *xopendirat(int dirfd, const char *name);