+
+ // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
+ // Add a second of slack to account for differences between clocks.
+ timespec timeout = clock_diff(now, last_activity);
+ timeout.tv_sec += timeout_secs + 1;
+ assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
+
+ bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
+ if (activity) {
+ err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
+ assert(err != -1);
+ } else {
+ // OK. Most likely, should_stop was set, or we have timed out.
+ continue;