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
30int
31lws_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)
50set:
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
64int
65lws_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
82void
83lws_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