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 #ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
26 #define _WINSOCK_DEPRECATED_NO_WARNINGS
27 #endif
28 #include "private-lib-core.h"
29
30 struct lws *
wsi_from_fd(const struct lws_context * context,lws_sockfd_type fd)31 wsi_from_fd(const struct lws_context *context, lws_sockfd_type fd)
32 {
33 int h = LWS_FD_HASH(fd);
34 int n = 0;
35
36 for (n = 0; n < context->fd_hashtable[h].length; n++)
37 if (context->fd_hashtable[h].wsi[n]->desc.sockfd == fd)
38 return context->fd_hashtable[h].wsi[n];
39
40 return NULL;
41 }
42
43 int
insert_wsi(struct lws_context * context,struct lws * wsi)44 insert_wsi(struct lws_context *context, struct lws *wsi)
45 {
46 int h = LWS_FD_HASH(wsi->desc.sockfd);
47
48 if (context->fd_hashtable[h].length == (getdtablesize() - 1)) {
49 lwsl_err("hash table overflow\n");
50 return 1;
51 }
52
53 context->fd_hashtable[h].wsi[context->fd_hashtable[h].length++] = wsi;
54
55 return 0;
56 }
57
58 int
delete_from_fd(struct lws_context * context,lws_sockfd_type fd)59 delete_from_fd(struct lws_context *context, lws_sockfd_type fd)
60 {
61 int h = LWS_FD_HASH(fd);
62 int n = 0;
63
64 for (n = 0; n < context->fd_hashtable[h].length; n++)
65 if (context->fd_hashtable[h].wsi[n]->desc.sockfd == fd) {
66 while (n < context->fd_hashtable[h].length) {
67 context->fd_hashtable[h].wsi[n] =
68 context->fd_hashtable[h].wsi[n + 1];
69 n++;
70 }
71 context->fd_hashtable[h].length--;
72
73 return 0;
74 }
75
76 lwsl_err("Failed to find fd %d requested for "
77 "delete in hashtable\n", fd);
78 return 1;
79 }
80