2 * libwebsockets - small server side websockets and web server implementation
4 * Copyright (C) 2010-2014 Andy Green <andy@warmcat.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation:
9 * version 2.1 of the License.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22 #include "private-libwebsockets.h"
25 insert_wsi_socket_into_fds(struct libwebsocket_context *context,
26 struct libwebsocket *wsi)
28 struct libwebsocket_pollargs pa = { wsi->sock, LWS_POLLIN, 0 };
30 if (context->fds_count >= context->max_fds) {
31 lwsl_err("Too many fds (%d)\n", context->max_fds);
36 if (wsi->sock >= context->max_fds) {
37 lwsl_err("Socket fd %d is too high (%d)\n",
38 wsi->sock, context->max_fds);
44 assert(wsi->sock >= 0);
46 lwsl_info("insert_wsi_socket_into_fds: wsi=%p, sock=%d, fds pos=%d\n",
47 wsi, wsi->sock, context->fds_count);
49 context->protocols[0].callback(context, wsi,
50 LWS_CALLBACK_LOCK_POLL,
51 wsi->user_space, (void *) &pa, 0);
53 insert_wsi(context, wsi);
54 wsi->position_in_fds_table = context->fds_count;
55 context->fds[context->fds_count].fd = wsi->sock;
56 context->fds[context->fds_count].events = LWS_POLLIN;
58 lws_plat_insert_socket_into_fds(context, wsi);
60 /* external POLL support via protocol 0 */
61 context->protocols[0].callback(context, wsi,
62 LWS_CALLBACK_ADD_POLL_FD,
63 wsi->user_space, (void *) &pa, 0);
65 context->protocols[0].callback(context, wsi,
66 LWS_CALLBACK_UNLOCK_POLL,
67 wsi->user_space, (void *)&pa, 0);
73 remove_wsi_socket_from_fds(struct libwebsocket_context *context,
74 struct libwebsocket *wsi)
77 struct libwebsocket_pollargs pa = { wsi->sock, 0, 0 };
79 lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
81 if (!--context->fds_count) {
82 context->protocols[0].callback(context, wsi,
83 LWS_CALLBACK_LOCK_POLL,
84 wsi->user_space, (void *) &pa, 0);
88 if (wsi->sock > context->max_fds) {
89 lwsl_err("Socket fd %d too high (%d)\n",
90 wsi->sock, context->max_fds);
94 lwsl_info("%s: wsi=%p, sock=%d, fds pos=%d\n", __func__,
95 wsi, wsi->sock, wsi->position_in_fds_table);
97 context->protocols[0].callback(context, wsi,
98 LWS_CALLBACK_LOCK_POLL,
99 wsi->user_space, (void *)&pa, 0);
101 m = wsi->position_in_fds_table; /* replace the contents for this */
103 /* have the last guy take up the vacant slot */
104 context->fds[m] = context->fds[context->fds_count];
106 lws_plat_delete_socket_from_fds(context, wsi, m);
109 * end guy's fds_lookup entry remains unchanged
110 * (still same fd pointing to same wsi)
112 /* end guy's "position in fds table" changed */
113 wsi_from_fd(context,context->fds[context->fds_count].fd)->
114 position_in_fds_table = m;
115 /* deletion guy's lws_lookup entry needs nuking */
116 delete_from_fd(context,wsi->sock);
117 /* removed wsi has no position any more */
118 wsi->position_in_fds_table = -1;
121 /* remove also from external POLL support via protocol 0 */
123 context->protocols[0].callback(context, wsi,
124 LWS_CALLBACK_DEL_POLL_FD, wsi->user_space,
127 context->protocols[0].callback(context, wsi,
128 LWS_CALLBACK_UNLOCK_POLL,
129 wsi->user_space, (void *) &pa, 0);
134 lws_change_pollfd(struct libwebsocket *wsi, int _and, int _or)
136 struct libwebsocket_context *context;
139 struct libwebsocket_pollfd *pfd;
140 struct libwebsocket_pollargs pa;
142 if (!wsi || !wsi->protocol || wsi->position_in_fds_table < 0)
145 context = wsi->protocol->owning_server;
149 pfd = &context->fds[wsi->position_in_fds_table];
152 context->protocols[0].callback(context, wsi,
153 LWS_CALLBACK_LOCK_POLL, wsi->user_space, (void *) &pa, 0);
155 pa.prev_events = pfd->events;
156 pa.events = pfd->events = (pfd->events & ~_and) | _or;
158 context->protocols[0].callback(context, wsi,
159 LWS_CALLBACK_CHANGE_MODE_POLL_FD,
160 wsi->user_space, (void *) &pa, 0);
163 * if we changed something in this pollfd...
164 * ... and we're running in a different thread context
165 * than the service thread...
166 * ... and the service thread is waiting ...
167 * then cancel it to force a restart with our changed events
169 if (pa.prev_events != pa.events) {
171 if (lws_plat_change_pollfd(context, wsi, pfd)) {
172 lwsl_info("%s failed\n", __func__);
176 sampled_tid = context->service_tid;
178 tid = context->protocols[0].callback(context, NULL,
179 LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
180 if (tid != sampled_tid)
181 libwebsocket_cancel_service(context);
185 context->protocols[0].callback(context, wsi,
186 LWS_CALLBACK_UNLOCK_POLL, wsi->user_space, (void *) &pa, 0);
193 * libwebsocket_callback_on_writable() - Request a callback when this socket
194 * becomes able to be written to without
197 * @context: libwebsockets context
198 * @wsi: Websocket connection instance to get callback for
202 libwebsocket_callback_on_writable(struct libwebsocket_context *context,
203 struct libwebsocket *wsi)
206 struct libwebsocket *network_wsi, *wsi2;
209 lwsl_info("%s: %p\n", __func__, wsi);
211 if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
214 if (wsi->u.http2.requested_POLLOUT) {
215 lwsl_info("already pending writable\n");
219 if (wsi->u.http2.tx_credit <= 0) {
221 * other side is not able to cope with us sending
222 * anything so no matter if we have POLLOUT on our side.
224 * Delay waiting for our POLLOUT until peer indicates he has
225 * space for more using tx window command in http2 layer
227 lwsl_info("%s: %p: waiting_tx_credit (%d)\n", __func__, wsi, wsi->u.http2.tx_credit);
228 wsi->u.http2.waiting_tx_credit = 1;
232 network_wsi = lws_http2_get_network_wsi(wsi);
233 already = network_wsi->u.http2.requested_POLLOUT;
235 /* mark everybody above him as requesting pollout */
239 wsi2->u.http2.requested_POLLOUT = 1;
240 lwsl_info("mark %p pending writable\n", wsi2);
241 wsi2 = wsi2->u.http2.parent_wsi;
244 /* for network action, act only on the network wsi */
252 if (lws_ext_callback_for_each_active(wsi,
253 LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE, NULL, 0))
256 if (wsi->position_in_fds_table < 0) {
257 lwsl_err("%s: failed to find socket %d\n", __func__, wsi->sock);
261 if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
264 lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_WRITE);
270 * libwebsocket_callback_on_writable_all_protocol() - Request a callback for
271 * all connections using the given protocol when it
272 * becomes possible to write to each socket without
275 * @protocol: Protocol whose connections will get callbacks
279 libwebsocket_callback_on_writable_all_protocol(
280 const struct libwebsocket_protocols *protocol)
282 struct libwebsocket_context *context = protocol->owning_server;
284 struct libwebsocket *wsi;
286 for (n = 0; n < context->fds_count; n++) {
287 wsi = wsi_from_fd(context,context->fds[n].fd);
290 if (wsi->protocol == protocol)
291 libwebsocket_callback_on_writable(context, wsi);