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108 lines
3.2 KiB
108 lines
3.2 KiB
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "private-lib-core.h"
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int
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lws_plat_pipe_create(struct lws *wsi)
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{
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struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
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struct sockaddr_in *si = &wsi->context->frt_pipe_si;
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lws_sockfd_type *fd = pt->dummy_pipe_fds;
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/*
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* There's no pipe abstraction on lwip / freertos... use a UDP socket
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* listening on 127.0.0.1:54321 and send a byte to it from a second UDP
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* socket to cancel the wait.
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*/
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fd[0] = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd[0] < 0)
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goto bail;
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fd[1] = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd[1] < 0)
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goto bail;
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/*
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* No need for memset since it's in zalloc'd context... it's in the
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* context so we can reuse the prepared sockaddr to send tp fd[0] whem
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* we want to cancel the wait
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*/
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si->sin_family = AF_INET;
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si->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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si->sin_port = htons(54321);
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if (bind(fd[0], (const struct sockaddr *)si, sizeof(*si)) < 0)
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goto bail;
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return 0;
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bail:
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lwsl_err("%s: failed\n", __func__);
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return 1;
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}
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int
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lws_plat_pipe_signal(struct lws *wsi)
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{
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struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
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struct sockaddr_in *si = &wsi->context->frt_pipe_si;
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lws_sockfd_type *fd = pt->dummy_pipe_fds;
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uint8_t u = 0;
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int n;
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/*
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* Send a single UDP byte payload to the listening socket fd[0], forcing
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* the event loop wait to wake. fd[1] and context->frt_pipe_si are
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* set at context creation and are static, the UDP sendto is supposed to
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* be threadsafe for lwip:
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*
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* https://lwip.fandom.com/wiki/LwIP_and_multithreading
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*
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* Sockets generally can't be used by more than one application thread
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* (on udp/raw netconn, doing a sendto/recv is currently possible).
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*/
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n = sendto(fd[1], &u, 1, 0, (struct sockaddr *)si, sizeof(*si));
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return n != 1;
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}
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void
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lws_plat_pipe_close(struct lws *wsi)
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{
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struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
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lws_sockfd_type *fd = pt->dummy_pipe_fds;
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if (fd[0] && fd[0] != -1)
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close(fd[0]);
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if (fd[1] && fd[1] != -1)
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close(fd[1]);
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fd[0] = fd[1] = -1;
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}
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