- if ( (rc = sendto(sock, NULL, 0, MSG_FASTOPEN, s_ptr, s_len)) < 0
- && errno == EOPNOTSUPP
- )
+ if ((rc = sendto(sock, fastopen->data, fastopen->len,
+ MSG_FASTOPEN | MSG_DONTWAIT, s_ptr, s_len)) >= 0)
+ /* seen for with-data, experimental TFO option, with-cookie case */
+ {
+ DEBUG(D_transport|D_v) debug_printf("TFO mode connection attempt, %s data\n",
+ fastopen->len > 0 ? "with" : "no");
+ tcp_out_fastopen = fastopen->len > 0 ? 2 : 1;
+ }
+ else if (errno == EINPROGRESS) /* expected for nonready peer */
+ /* seen for no-data, proper TFO option, both cookie-request and with-cookie cases */
+ /* apparently no visibility of the diffference at this point */
+ /* with netwk delay, post-conn tcp_info sees unacked 1 for R, 2 for C; code in smtp_out.c */
+ /* ? older Experimental TFO option behaviour ? */
+ { /* queue unsent data */
+ if (!fastopen->data)
+ {
+ tcp_out_fastopen = 1; /* we tried; unknown if useful yet */
+ rc = 0;
+ }
+ else if ( (rc = send(sock, fastopen->data, fastopen->len, 0)) < 0
+ && errno == EINPROGRESS /* expected for nonready peer */
+ )
+ rc = 0;
+ }
+ else if(errno == EOPNOTSUPP)