+ /* Set socket to nonblock */
+ ret = fcntl(sock->fd, F_SETFL, flags | O_NONBLOCK);
+ if (ret == -1) {
+ PERROR("fcntl");
+ return -1;
+ }
+
+ ret = lttng_clock_gettime(CLOCK_MONOTONIC, &orig_time);
+ if (ret == -1) {
+ PERROR("clock_gettime");
+ return -1;
+ }
+
+ connect_ret = connect(sock->fd,
+ (struct sockaddr *) &sock->sockaddr.addr.sin6,
+ sizeof(sock->sockaddr.addr.sin6));
+ if (connect_ret == -1 && errno != EAGAIN
+ && errno != EWOULDBLOCK
+ && errno != EINPROGRESS) {
+ goto error;
+ } else if (!connect_ret) {
+ /* Connect succeeded */
+ goto success;
+ }
+
+ DBG("Asynchronous connect for sock %d, performing polling with"
+ " timeout: %lums", sock->fd, timeout);
+
+ /*
+ * Perform poll loop following EINPROGRESS recommendation from
+ * connect(2) man page.
+ */
+ do {
+ struct pollfd fds;
+
+ fds.fd = sock->fd;
+ fds.events = POLLOUT;
+ fds.revents = 0;
+ ret = poll(&fds, 1, RECONNECT_DELAY);
+ if (ret < 0) {
+ goto error;
+ } else if (ret > 0) {
+ int optval;
+ socklen_t optval_len = sizeof(optval);
+
+ if (!(fds.revents & POLLOUT)) {
+ /* Either hup or error */
+ errno = EPIPE;
+ goto error;
+ }
+ /* got something */
+ ret = getsockopt(sock->fd, SOL_SOCKET,
+ SO_ERROR, &optval, &optval_len);
+ if (ret) {
+ PERROR("getsockopt");
+ goto error;
+ }
+ if (!optval) {
+ connect_ret = 0;
+ goto success;
+ } else {
+ /* Get actual connect() errno from opt_val */
+ errno = optval;
+ goto error;
+ }
+ }
+ /* ret == 0: timeout */
+ ret = lttng_clock_gettime(CLOCK_MONOTONIC, &cur_time);
+ if (ret == -1) {
+ PERROR("clock_gettime");
+ connect_ret = ret;
+ goto error;
+ }
+ if (timespec_to_ms(timespec_abs_diff(cur_time, orig_time), &diff_ms) < 0) {
+ ERR("timespec_to_ms input overflows milliseconds output");
+ connect_ret = -1;
+ goto error;
+ }
+ } while (diff_ms < timeout);
+
+ /* Timeout */
+ errno = ETIMEDOUT;
+ connect_ret = -1;
+
+success:
+ /* Restore initial flags */
+ ret = fcntl(sock->fd, F_SETFL, flags);
+ if (ret == -1) {
+ PERROR("fcntl");
+ /* Continue anyway */
+ }
+error:
+ return connect_ret;