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When SO_LINGER is enabled w/ linger time = 0, do hard disconnect regardless of whether there's any pending or unacked data
References: - Wright & Stevens, "TCP/IP Illustrated, Volume 2" - 30.4. tcp_disconnect Function - Figure 30.12. tcp_disconnect function: initiate TCP disconnect. - "Hard disconnect" section - UNIX Network Programming / Volume 1, Third Edition: The Sockets Networking API (aka "UNP") - 7.5 Generic Socket Options - "SO_LINGER Socket Option" section
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@ -981,14 +981,14 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
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#if LWIP_SO_LINGER
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/* check linger possibilities before calling tcp_close */
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err = ERR_OK;
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/* linger enabled/required at all? (i.e. is there untransmitted data left?) */
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if ((conn->linger >= 0) && (conn->pcb.tcp->unsent || conn->pcb.tcp->unacked)) {
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/* linger enabled? */
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if (conn->linger >= 0) {
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if ((conn->linger == 0)) {
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/* data left but linger prevents waiting */
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/* 0-timeout linger prevents waiting */
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tcp_abort(tpcb);
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tpcb = NULL;
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} else if (conn->linger > 0) {
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/* data left and linger says we should wait */
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} else if (conn->pcb.tcp->unsent || conn->pcb.tcp->unacked) {
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/* data left and nonzero linger says we should wait */
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if (netconn_is_nonblocking(conn)) {
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/* data left on a nonblocking netconn -> cannot linger */
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err = ERR_WOULDBLOCK;
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