+bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b);
+#endif // 0
+
+int fd_inc_sndbuf(int fd, size_t n);
+int fd_inc_rcvbuf(int fd, size_t n);
+#if 0 /// UNNEEDED by elogind
+
+int ip_tos_to_string_alloc(int i, char **s);
+int ip_tos_from_string(const char *s);
+#endif // 0
+
+bool ifname_valid(const char *p);
+
+int getpeercred(int fd, struct ucred *ucred);
+int getpeersec(int fd, char **ret);
+
+int send_one_fd_sa(int transport_fd,
+ int fd,
+ const struct sockaddr *sa, socklen_t len,
+ int flags);
+#define send_one_fd(transport_fd, fd, flags) send_one_fd_sa(transport_fd, fd, NULL, 0, flags)
+#if 0 /// UNNEEDED by elogind
+int receive_one_fd(int transport_fd, int flags);
+
+ssize_t next_datagram_size_fd(int fd);
+
+int flush_accept(int fd);
+#endif // 0