+#ifdef EXIM_TFO_FREEBSD
+/* Under some fault conditions, FreeBSD 12.2 seen to send a (non-TFO) SYN
+and, getting no response, wait for a long time. Impose a 5s max. */
+if (fd >= 0)
+ {
+ struct timeval tv = {.tv_sec = 5};
+ fd_set fds;
+ FD_ZERO(fds); FD_SET(fd, &fds); (void) select(fd+1, NULL, &fds, NULL, &tv);
+ }
+#endif
+return fd;