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 <[email protected]>
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