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added function tcp_listen_with_backlog_and_err() to get the error reason when listening fails (bug #49861)

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This commit is contained in:
sg
2016-12-31 15:36:31 +01:00
parent 1884c7e83f
commit 98fc82fa71
4 changed files with 53 additions and 13 deletions
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44
src/core/tcp.c
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@@ -636,19 +636,44 @@ tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
*
* @note The original tcp_pcb is freed. This function therefore has to be
* called like this:
* tpcb = tcp_listen(tpcb);
* tpcb = tcp_listen_with_backlog(tpcb, backlog);
*/
struct tcp_pcb *
tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
{
struct tcp_pcb_listen *lpcb;
return tcp_listen_with_backlog_and_err(pcb, backlog, NULL);
}
/**
* @ingroup tcp_raw
* Set the state of the connection to be LISTEN, which means that it
* is able to accept incoming connections. The protocol control block
* is reallocated in order to consume less memory. Setting the
* connection to LISTEN is an irreversible process.
*
* @param pcb the original tcp_pcb
* @param backlog the incoming connections queue limit
* @param err when NULL is returned, this contains the error reason
* @return tcp_pcb used for listening, consumes less memory.
*
* @note The original tcp_pcb is freed. This function therefore has to be
* called like this:
* tpcb = tcp_listen_with_backlog_and_err(tpcb, backlog, &err);
*/
struct tcp_pcb *
tcp_listen_with_backlog_and_err(struct tcp_pcb *pcb, u8_t backlog, err_t *err)
{
struct tcp_pcb_listen *lpcb = NULL;
err_t res;
LWIP_UNUSED_ARG(backlog);
LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, res = ERR_CLSD; goto done);
/* already listening? */
if (pcb->state == LISTEN) {
return pcb;
lpcb = (struct tcp_pcb_listen*)pcb;
res = ERR_ALREADY;
goto done;
}
#if SO_REUSE
if (ip_get_option(pcb, SOF_REUSEADDR)) {
@@ -659,14 +684,16 @@ tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
if ((lpcb->local_port == pcb->local_port) &&
ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
/* this address/port is already used */
return NULL;
res = ERR_USE;
goto done;
}
}
}
#endif /* SO_REUSE */
lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
if (lpcb == NULL) {
return NULL;
res = ERR_MEM;
goto done;
}
lpcb->callback_arg = pcb->callback_arg;
lpcb->local_port = pcb->local_port;
@@ -691,6 +718,11 @@ tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
tcp_backlog_set(lpcb, backlog);
#endif /* TCP_LISTEN_BACKLOG */
TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
res = ERR_OK;
done:
if (err != NULL) {
*err = res;
}
return (struct tcp_pcb *)lpcb;
}