xref: /aosp_15_r20/external/libwebsockets/lib/plat/unix/unix-pipe.c (revision 1c60b9aca93fdbc9b5f19b2d2194c91294b22281)
1 *1c60b9acSAndroid Build Coastguard Worker /*
2 *1c60b9acSAndroid Build Coastguard Worker  * libwebsockets - small server side websockets and web server implementation
3 *1c60b9acSAndroid Build Coastguard Worker  *
4 *1c60b9acSAndroid Build Coastguard Worker  * Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
5 *1c60b9acSAndroid Build Coastguard Worker  *
6 *1c60b9acSAndroid Build Coastguard Worker  * Permission is hereby granted, free of charge, to any person obtaining a copy
7 *1c60b9acSAndroid Build Coastguard Worker  * of this software and associated documentation files (the "Software"), to
8 *1c60b9acSAndroid Build Coastguard Worker  * deal in the Software without restriction, including without limitation the
9 *1c60b9acSAndroid Build Coastguard Worker  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 *1c60b9acSAndroid Build Coastguard Worker  * sell copies of the Software, and to permit persons to whom the Software is
11 *1c60b9acSAndroid Build Coastguard Worker  * furnished to do so, subject to the following conditions:
12 *1c60b9acSAndroid Build Coastguard Worker  *
13 *1c60b9acSAndroid Build Coastguard Worker  * The above copyright notice and this permission notice shall be included in
14 *1c60b9acSAndroid Build Coastguard Worker  * all copies or substantial portions of the Software.
15 *1c60b9acSAndroid Build Coastguard Worker  *
16 *1c60b9acSAndroid Build Coastguard Worker  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 *1c60b9acSAndroid Build Coastguard Worker  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 *1c60b9acSAndroid Build Coastguard Worker  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 *1c60b9acSAndroid Build Coastguard Worker  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 *1c60b9acSAndroid Build Coastguard Worker  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 *1c60b9acSAndroid Build Coastguard Worker  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 *1c60b9acSAndroid Build Coastguard Worker  * IN THE SOFTWARE.
23 *1c60b9acSAndroid Build Coastguard Worker  */
24 *1c60b9acSAndroid Build Coastguard Worker 
25 *1c60b9acSAndroid Build Coastguard Worker #if !defined(_GNU_SOURCE)
26 *1c60b9acSAndroid Build Coastguard Worker #define _GNU_SOURCE
27 *1c60b9acSAndroid Build Coastguard Worker #endif
28 *1c60b9acSAndroid Build Coastguard Worker #include "private-lib-core.h"
29 *1c60b9acSAndroid Build Coastguard Worker 
30 *1c60b9acSAndroid Build Coastguard Worker int
lws_plat_pipe_create(struct lws * wsi)31 *1c60b9acSAndroid Build Coastguard Worker lws_plat_pipe_create(struct lws *wsi)
32 *1c60b9acSAndroid Build Coastguard Worker {
33 *1c60b9acSAndroid Build Coastguard Worker 	struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi];
34 *1c60b9acSAndroid Build Coastguard Worker 	int n;
35 *1c60b9acSAndroid Build Coastguard Worker 
36 *1c60b9acSAndroid Build Coastguard Worker #if defined(LWS_HAVE_EVENTFD)
37 *1c60b9acSAndroid Build Coastguard Worker 	pt->dummy_pipe_fds[0] = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
38 *1c60b9acSAndroid Build Coastguard Worker 	pt->dummy_pipe_fds[1] = -1;
39 *1c60b9acSAndroid Build Coastguard Worker 
40 *1c60b9acSAndroid Build Coastguard Worker 	n = pt->dummy_pipe_fds[0] < 0 ? -1 : 0;
41 *1c60b9acSAndroid Build Coastguard Worker 	goto set;
42 *1c60b9acSAndroid Build Coastguard Worker 
43 *1c60b9acSAndroid Build Coastguard Worker #elif defined(LWS_HAVE_PIPE2)
44 *1c60b9acSAndroid Build Coastguard Worker 	n = pipe2(pt->dummy_pipe_fds, O_NONBLOCK);
45 *1c60b9acSAndroid Build Coastguard Worker #else
46 *1c60b9acSAndroid Build Coastguard Worker 	n = pipe(pt->dummy_pipe_fds);
47 *1c60b9acSAndroid Build Coastguard Worker #endif
48 *1c60b9acSAndroid Build Coastguard Worker 
49 *1c60b9acSAndroid Build Coastguard Worker #if defined(LWS_HAVE_EVENTFD)
50 *1c60b9acSAndroid Build Coastguard Worker set:
51 *1c60b9acSAndroid Build Coastguard Worker #endif
52 *1c60b9acSAndroid Build Coastguard Worker 	if (n >= 0) {
53 *1c60b9acSAndroid Build Coastguard Worker 		if (fcntl(pt->dummy_pipe_fds[0], F_SETFL, O_NONBLOCK) < 0)
54 *1c60b9acSAndroid Build Coastguard Worker 			n = -1;
55 *1c60b9acSAndroid Build Coastguard Worker 		else if (pt->dummy_pipe_fds[1] >= 0) {
56 *1c60b9acSAndroid Build Coastguard Worker 			if (fcntl(pt->dummy_pipe_fds[1], F_SETFL, O_NONBLOCK) < 0)
57 *1c60b9acSAndroid Build Coastguard Worker 				n = -1;
58 *1c60b9acSAndroid Build Coastguard Worker 		}
59 *1c60b9acSAndroid Build Coastguard Worker 	}
60 *1c60b9acSAndroid Build Coastguard Worker 
61 *1c60b9acSAndroid Build Coastguard Worker 	return n;
62 *1c60b9acSAndroid Build Coastguard Worker }
63 *1c60b9acSAndroid Build Coastguard Worker 
64 *1c60b9acSAndroid Build Coastguard Worker int
lws_plat_pipe_signal(struct lws_context * ctx,int tsi)65 *1c60b9acSAndroid Build Coastguard Worker lws_plat_pipe_signal(struct lws_context *ctx, int tsi)
66 *1c60b9acSAndroid Build Coastguard Worker {
67 *1c60b9acSAndroid Build Coastguard Worker 	struct lws_context_per_thread *pt = &ctx->pt[tsi];
68 *1c60b9acSAndroid Build Coastguard Worker #if defined(LWS_HAVE_EVENTFD)
69 *1c60b9acSAndroid Build Coastguard Worker 	eventfd_t value = 1;
70 *1c60b9acSAndroid Build Coastguard Worker 
71 *1c60b9acSAndroid Build Coastguard Worker 	return eventfd_write(pt->dummy_pipe_fds[0], value);
72 *1c60b9acSAndroid Build Coastguard Worker #else
73 *1c60b9acSAndroid Build Coastguard Worker 	char buf = 0;
74 *1c60b9acSAndroid Build Coastguard Worker 	int n;
75 *1c60b9acSAndroid Build Coastguard Worker 
76 *1c60b9acSAndroid Build Coastguard Worker 	n = (int)write(pt->dummy_pipe_fds[1], &buf, 1);
77 *1c60b9acSAndroid Build Coastguard Worker 
78 *1c60b9acSAndroid Build Coastguard Worker 	return n != 1;
79 *1c60b9acSAndroid Build Coastguard Worker #endif
80 *1c60b9acSAndroid Build Coastguard Worker }
81 *1c60b9acSAndroid Build Coastguard Worker 
82 *1c60b9acSAndroid Build Coastguard Worker void
lws_plat_pipe_close(struct lws * wsi)83 *1c60b9acSAndroid Build Coastguard Worker lws_plat_pipe_close(struct lws *wsi)
84 *1c60b9acSAndroid Build Coastguard Worker {
85 *1c60b9acSAndroid Build Coastguard Worker 	struct lws_context_per_thread *pt = &wsi->a.context->pt[(int)wsi->tsi];
86 *1c60b9acSAndroid Build Coastguard Worker 
87 *1c60b9acSAndroid Build Coastguard Worker 	if (pt->dummy_pipe_fds[0] && pt->dummy_pipe_fds[0] != -1)
88 *1c60b9acSAndroid Build Coastguard Worker 		close(pt->dummy_pipe_fds[0]);
89 *1c60b9acSAndroid Build Coastguard Worker 	if (pt->dummy_pipe_fds[1] && pt->dummy_pipe_fds[1] != -1)
90 *1c60b9acSAndroid Build Coastguard Worker 		close(pt->dummy_pipe_fds[1]);
91 *1c60b9acSAndroid Build Coastguard Worker 
92 *1c60b9acSAndroid Build Coastguard Worker 	pt->dummy_pipe_fds[0] = pt->dummy_pipe_fds[1] = -1;
93 *1c60b9acSAndroid Build Coastguard Worker }
94