1 /*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2019 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
31 int
lws_plat_pipe_create(struct lws * wsi)32 lws_plat_pipe_create(struct lws *wsi)
33 {
34 struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
35 #if defined(LWS_HAVE_EVENTFD)
36 pt->dummy_pipe_fds[0] = eventfd(0, EFD_CLOEXEC|EFD_NONBLOCK);
37 pt->dummy_pipe_fds[1] = -1;
38 return pt->dummy_pipe_fds[0]<0?-1:0;
39 #elif defined(LWS_HAVE_PIPE2)
40 return pipe2(pt->dummy_pipe_fds, O_NONBLOCK);
41 #else
42 return pipe(pt->dummy_pipe_fds);
43 #endif
44 }
45
46 int
lws_plat_pipe_signal(struct lws * wsi)47 lws_plat_pipe_signal(struct lws *wsi)
48 {
49 struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
50 #if defined(LWS_HAVE_EVENTFD)
51 eventfd_t value = 1;
52 return eventfd_write(pt->dummy_pipe_fds[0], value);
53 #else
54 char buf = 0;
55 int n;
56
57 n = write(pt->dummy_pipe_fds[1], &buf, 1);
58
59 return n != 1;
60 #endif
61 }
62
63 void
lws_plat_pipe_close(struct lws * wsi)64 lws_plat_pipe_close(struct lws *wsi)
65 {
66 struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
67
68 if (pt->dummy_pipe_fds[0] && pt->dummy_pipe_fds[0] != -1)
69 close(pt->dummy_pipe_fds[0]);
70 if (pt->dummy_pipe_fds[1] && pt->dummy_pipe_fds[1] != -1)
71 close(pt->dummy_pipe_fds[1]);
72
73 pt->dummy_pipe_fds[0] = pt->dummy_pipe_fds[1] = -1;
74 }
75
76