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freertos: have lwip choose the cancel pipe port

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Rather than a magic port, let's have lwip pick the port for
the UDP cancel "pipe", so no chance of conflict.
This commit is contained in:
Andy Green 2020-10-08 11:16:17 +01:00
parent ee78b90c8c
commit 2ad378095d
1 changed files with 21 additions and 2 deletions
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23
lib/plat/freertos/freertos-pipe.c
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@ -30,11 +30,15 @@ lws_plat_pipe_create(struct lws *wsi)
struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi];
struct sockaddr_in *si = &wsi->a.context->frt_pipe_si;
lws_sockfd_type *fd = pt->dummy_pipe_fds;
socklen_t sl;
/*
* There's no pipe abstraction on lwip / freertos... use a UDP socket
* listening on 127.0.0.1:54321 and send a byte to it from a second UDP
* listening on 127.0.0.1:xxxx and send a byte to it from a second UDP
* socket to cancel the wait.
*
* Set the port to 0 at the bind, so lwip will choose a free one in the
* ephemeral range for us.
*/
fd[0] = socket(AF_INET, SOCK_DGRAM, 0);
@ -53,11 +57,26 @@ lws_plat_pipe_create(struct lws *wsi)
si->sin_family = AF_INET;
si->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
si->sin_port = htons(54321);
si->sin_port = 0;
if (bind(fd[0], (const struct sockaddr *)si, sizeof(*si)) < 0)
goto bail;
/*
* Query the socket to set context->frt_pipe_si to the full sockaddr it
* wants to be addressed by, including the port that lwip chose.
*
* Afterwards, we can use this prepared sockaddr stashed in the context
* to trigger the "pipe" without any other preliminaries.
*/
sl = sizeof(*si);
if (getsockname(fd[0], (struct sockaddr *)si, &sl))
goto bail;
lwsl_info("%s: cancel UDP skt port %d\n", __func__,
ntohs(si->sin_port));
return 0;
bail: