| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| * IN THE SOFTWARE. |
| */ |
| |
| #ifndef _WINSOCK_DEPRECATED_NO_WARNINGS |
| #define _WINSOCK_DEPRECATED_NO_WARNINGS |
| #endif |
| #include "private-lib-core.h" |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <io.h> |
| #include <fcntl.h> |
| |
| int |
| 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; |
| |
| /* |
| * Non-WSA HANDLEs can't join the WSAPoll() wait... use a UDP socket |
| * 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); |
| if (fd[0] == INVALID_SOCKET) |
| goto bail; |
| |
| fd[1] = socket(AF_INET, SOCK_DGRAM, 0); |
| if (fd[1] == INVALID_SOCKET) |
| goto bail; |
| |
| /* |
| * No need for memset since it's in zalloc'd context... it's in the |
| * context so we can reuse the prepared sockaddr to send tp fd[0] whem |
| * we want to cancel the wait |
| */ |
| |
| si->sin_family = AF_INET; |
| si->sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 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: |
| lwsl_err("%s: failed\n", __func__); |
| |
| return 1; |
| } |
| |
| int |
| lws_plat_pipe_signal(struct lws_context *ctx, int tsi) |
| { |
| struct lws_context_per_thread *pt = &ctx->pt[tsi]; |
| struct sockaddr_in *si = &ctx->frt_pipe_si; |
| lws_sockfd_type *fd = pt->dummy_pipe_fds; |
| char u = 0; |
| int n; |
| |
| /* |
| * Send a single UDP byte payload to the listening socket fd[0], forcing |
| * the event loop wait to wake. fd[1] and context->frt_pipe_si are |
| * set at context creation and are static. |
| */ |
| |
| n = sendto(fd[1], &u, 1, 0, (struct sockaddr *)si, sizeof(*si)); |
| |
| return n != 1; |
| } |
| |
| void |
| lws_plat_pipe_close(struct lws *wsi) |
| { |
| struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi]; |
| |
| if (pt->dummy_pipe_fds[0] && pt->dummy_pipe_fds[0] != LWS_SOCK_INVALID) |
| closesocket(pt->dummy_pipe_fds[0]); |
| if (pt->dummy_pipe_fds[1] && pt->dummy_pipe_fds[1] != LWS_SOCK_INVALID) |
| closesocket(pt->dummy_pipe_fds[1]); |
| |
| pt->dummy_pipe_fds[0] = pt->dummy_pipe_fds[1] = LWS_SOCK_INVALID; |
| } |