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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

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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
This commit is contained in:
Brendan McDonnell 2024-07-02 17:47:14 -04:00
parent 73fcf72792
commit a4eeaac87c
1 changed files with 5 additions and 5 deletions
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10
src/api/api_msg.c
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@ -981,14 +981,14 @@ lwip_netconn_do_close_internal(struct netconn *conn WRITE_DELAYED_PARAM)
#if LWIP_SO_LINGER #if LWIP_SO_LINGER
/* check linger possibilities before calling tcp_close */ /* check linger possibilities before calling tcp_close */
err = ERR_OK; err = ERR_OK;
/* linger enabled/required at all? (i.e. is there untransmitted data left?) */ /* linger enabled? */
if ((conn->linger >= 0) && (conn->pcb.tcp->unsent || conn->pcb.tcp->unacked)) { if (conn->linger >= 0) {
if ((conn->linger == 0)) { if ((conn->linger == 0)) {
/* data left but linger prevents waiting */ /* 0-timeout linger prevents waiting */
tcp_abort(tpcb); tcp_abort(tpcb);
tpcb = NULL; tpcb = NULL;
} else if (conn->linger > 0) { } else if (conn->pcb.tcp->unsent || conn->pcb.tcp->unacked) {
/* data left and linger says we should wait */ /* data left and nonzero linger says we should wait */
if (netconn_is_nonblocking(conn)) { if (netconn_is_nonblocking(conn)) {
/* data left on a nonblocking netconn -> cannot linger */ /* data left on a nonblocking netconn -> cannot linger */
err = ERR_WOULDBLOCK; err = ERR_WOULDBLOCK;