+
+/*********************************************************************
+ *
+ * Function : socket_is_still_usable
+ *
+ * Description : Decides whether or not an open socket is still usable.
+ *
+ * Parameters :
+ * 1 : sfd = The socket to check.
+ *
+ * Returns : TRUE for yes, otherwise FALSE.
+ *
+ *********************************************************************/
+static int socket_is_still_usable(jb_socket sfd)
+{
+#ifdef HAVE_POLL
+ int poll_result;
+ struct pollfd poll_fd[1];
+ memset(poll_fd, 0, sizeof(poll_fd));
+ poll_fd[0].fd = sfd;
+ poll_fd[0].events = POLLIN;
+
+ poll_result = poll(poll_fd, 1, 0);
+
+ if (-1 != poll_result)
+ {
+ return !(poll_fd[0].revents & POLLIN);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
+ return FALSE;
+ }
+#else
+ log_error(LOG_LEVEL_INFO,
+ "Detecting already dead sockets isn't implemented for your "
+ "platform yet. Assuming sockets stay alive forever, expect "
+ "an increase in connection problems.");
+ return TRUE;
+#endif /* def HAVE_POLL */
+}
+
+