1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25 #if !defined(_GNU_SOURCE)
26 #define _GNU_SOURCE
27 #endif
28 #include "private-lib-core.h"
29
30 int
lws_plat_pipe_create(struct lws * wsi)31 lws_plat_pipe_create(struct lws *wsi)
32 {
33 struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi];
34 int n;
35
36 #if defined(LWS_HAVE_EVENTFD)
37 pt->dummy_pipe_fds[0] = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
38 pt->dummy_pipe_fds[1] = -1;
39
40 n = pt->dummy_pipe_fds[0] < 0 ? -1 : 0;
41 goto set;
42
43 #elif defined(LWS_HAVE_PIPE2)
44 n = pipe2(pt->dummy_pipe_fds, O_NONBLOCK);
45 #else
46 n = pipe(pt->dummy_pipe_fds);
47 #endif
48
49 #if defined(LWS_HAVE_EVENTFD)
50 set:
51 #endif
52 if (n >= 0) {
53 if (fcntl(pt->dummy_pipe_fds[0], F_SETFL, O_NONBLOCK) < 0)
54 n = -1;
55 else if (pt->dummy_pipe_fds[1] >= 0) {
56 if (fcntl(pt->dummy_pipe_fds[1], F_SETFL, O_NONBLOCK) < 0)
57 n = -1;
58 }
59 }
60
61 return n;
62 }
63
64 int
lws_plat_pipe_signal(struct lws_context * ctx,int tsi)65 lws_plat_pipe_signal(struct lws_context *ctx, int tsi)
66 {
67 struct lws_context_per_thread *pt = &ctx->pt[tsi];
68 #if defined(LWS_HAVE_EVENTFD)
69 eventfd_t value = 1;
70
71 return eventfd_write(pt->dummy_pipe_fds[0], value);
72 #else
73 char buf = 0;
74 int n;
75
76 n = (int)write(pt->dummy_pipe_fds[1], &buf, 1);
77
78 return n != 1;
79 #endif
80 }
81
82 void
lws_plat_pipe_close(struct lws * wsi)83 lws_plat_pipe_close(struct lws *wsi)
84 {
85 struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi];
86
87 if (pt->dummy_pipe_fds[0] && pt->dummy_pipe_fds[0] != -1)
88 close(pt->dummy_pipe_fds[0]);
89 if (pt->dummy_pipe_fds[1] && pt->dummy_pipe_fds[1] != -1)
90 close(pt->dummy_pipe_fds[1]);
91
92 pt->dummy_pipe_fds[0] = pt->dummy_pipe_fds[1] = -1;
93 }
94