+
+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);
+#endif // 0
+
+#define CMSG_FOREACH(cmsg, mh) \
+ for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))