#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);
#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);