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 #include <private-lib-core.h>
26
27 static int
rops_handle_POLLIN_pipe(struct lws_context_per_thread * pt,struct lws * wsi,struct lws_pollfd * pollfd)28 rops_handle_POLLIN_pipe(struct lws_context_per_thread *pt, struct lws *wsi,
29 struct lws_pollfd *pollfd)
30 {
31 #if defined(LWS_HAVE_EVENTFD)
32 eventfd_t value;
33 if (eventfd_read(wsi->desc.sockfd, &value) < 0)
34 return LWS_HPI_RET_PLEASE_CLOSE_ME;
35 #elif !defined(WIN32) && !defined(_WIN32)
36 char s[100];
37 int n;
38
39 /*
40 * discard the byte(s) that signaled us
41 * We really don't care about the number of bytes, but coverity
42 * thinks we should.
43 */
44 n = read(wsi->desc.sockfd, s, sizeof(s));
45 (void)n;
46 if (n < 0)
47 return LWS_HPI_RET_PLEASE_CLOSE_ME;
48 #endif
49
50 #if defined(LWS_WITH_THREADPOOL)
51 /*
52 * threadpools that need to call for on_writable callbacks do it by
53 * marking the task as needing one for its wsi, then cancelling service.
54 *
55 * Each tsi will call this to perform the actual callback_on_writable
56 * from the correct service thread context
57 */
58 lws_threadpool_tsi_context(pt->context, pt->tid);
59 #endif
60
61 /*
62 * the poll() wait, or the event loop for libuv etc is a
63 * process-wide resource that we interrupted. So let every
64 * protocol that may be interested in the pipe event know that
65 * it happened.
66 */
67 if (lws_broadcast(pt, LWS_CALLBACK_EVENT_WAIT_CANCELLED, NULL, 0)) {
68 lwsl_info("closed in event cancel\n");
69 return LWS_HPI_RET_PLEASE_CLOSE_ME;
70 }
71
72 return LWS_HPI_RET_HANDLED;
73 }
74
75 const struct lws_role_ops role_ops_pipe = {
76 /* role name */ "pipe",
77 /* alpn id */ NULL,
78 /* check_upgrades */ NULL,
79 /* pt_init_destroy */ NULL,
80 /* init_vhost */ NULL,
81 /* destroy_vhost */ NULL,
82 /* service_flag_pending */ NULL,
83 /* handle_POLLIN */ rops_handle_POLLIN_pipe,
84 /* handle_POLLOUT */ NULL,
85 /* perform_user_POLLOUT */ NULL,
86 /* callback_on_writable */ NULL,
87 /* tx_credit */ NULL,
88 /* write_role_protocol */ NULL,
89 /* encapsulation_parent */ NULL,
90 /* alpn_negotiated */ NULL,
91 /* close_via_role_protocol */ NULL,
92 /* close_role */ NULL,
93 /* close_kill_connection */ NULL,
94 /* destroy_role */ NULL,
95 /* adoption_bind */ NULL,
96 /* client_bind */ NULL,
97 /* issue_keepalive */ NULL,
98 /* adoption_cb clnt, srv */ { 0, 0 },
99 /* rx_cb clnt, srv */ { 0, 0 },
100 /* writeable cb clnt, srv */ { 0, 0 },
101 /* close cb clnt, srv */ { 0, 0 },
102 /* protocol_bind_cb c,s */ { 0, 0 },
103 /* protocol_unbind_cb c,s */ { 0, 0 },
104 /* file_handle */ 1,
105 };
106