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);
83 if (wsi->sock > context->max_fds) {
84 lwsl_err("Socket fd %d too high (%d)\n",
85 wsi->sock, context->max_fds);
89 lwsl_info("%s: wsi=%p, sock=%d, fds pos=%d\n", __func__,
90 wsi, wsi->sock, wsi->position_in_fds_table);
92 context->protocols[0].callback(context, wsi,
93 LWS_CALLBACK_LOCK_POLL,
94 wsi->user_space, (void *)&pa, 0);
96 m = wsi->position_in_fds_table; /* replace the contents for this */
98 /* have the last guy take up the vacant slot */
99 context->fds[m] = context->fds[context->fds_count];
101 lws_plat_delete_socket_from_fds(context, wsi, m);
104 * end guy's fds_lookup entry remains unchanged
105 * (still same fd pointing to same wsi)
107 /* end guy's "position in fds table" changed */
108 wsi_from_fd(context,context->fds[context->fds_count].fd)->
109 position_in_fds_table = m;
110 /* deletion guy's lws_lookup entry needs nuking */
111 delete_from_fd(context,wsi->sock);
112 /* removed wsi has no position any more */
113 wsi->position_in_fds_table = -1;
115 /* remove also from external POLL support via protocol 0 */
117 context->protocols[0].callback(context, wsi,
118 LWS_CALLBACK_DEL_POLL_FD, wsi->user_space,
121 context->protocols[0].callback(context, wsi,
122 LWS_CALLBACK_UNLOCK_POLL,
123 wsi->user_space, (void *) &pa, 0);
128 lws_change_pollfd(struct libwebsocket *wsi, int _and, int _or)
130 struct libwebsocket_context *context;
133 struct libwebsocket_pollfd *pfd;
134 struct libwebsocket_pollargs pa;
136 if (!wsi || !wsi->protocol || wsi->position_in_fds_table < 0)
139 context = wsi->protocol->owning_server;
143 pfd = &context->fds[wsi->position_in_fds_table];
146 context->protocols[0].callback(context, wsi,
147 LWS_CALLBACK_LOCK_POLL, wsi->user_space, (void *) &pa, 0);
149 pa.prev_events = pfd->events;
150 pa.events = pfd->events = (pfd->events & ~_and) | _or;
152 context->protocols[0].callback(context, wsi,
153 LWS_CALLBACK_CHANGE_MODE_POLL_FD,
154 wsi->user_space, (void *) &pa, 0);
157 * if we changed something in this pollfd...
158 * ... and we're running in a different thread context
159 * than the service thread...
160 * ... and the service thread is waiting ...
161 * then cancel it to force a restart with our changed events
163 if (pa.prev_events != pa.events) {
165 if (lws_plat_change_pollfd(context, wsi, pfd)) {
166 lwsl_info("%s failed\n", __func__);
170 sampled_tid = context->service_tid;
172 tid = context->protocols[0].callback(context, NULL,
173 LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
174 if (tid != sampled_tid)
175 libwebsocket_cancel_service(context);
179 context->protocols[0].callback(context, wsi,
180 LWS_CALLBACK_UNLOCK_POLL, wsi->user_space, (void *) &pa, 0);
187 * libwebsocket_callback_on_writable() - Request a callback when this socket
188 * becomes able to be written to without
191 * @context: libwebsockets context
192 * @wsi: Websocket connection instance to get callback for
196 libwebsocket_callback_on_writable(struct libwebsocket_context *context,
197 struct libwebsocket *wsi)
200 struct libwebsocket *network_wsi, *wsi2;
203 lwsl_info("%s: %p\n", __func__, wsi);
205 if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
208 if (wsi->u.http2.requested_POLLOUT) {
209 lwsl_info("already pending writable\n");
213 if (wsi->u.http2.tx_credit <= 0) {
215 * other side is not able to cope with us sending
216 * anything so no matter if we have POLLOUT on our side.
218 * Delay waiting for our POLLOUT until peer indicates he has
219 * space for more using tx window command in http2 layer
221 lwsl_info("%s: %p: waiting_tx_credit (%d)\n", __func__, wsi, wsi->u.http2.tx_credit);
222 wsi->u.http2.waiting_tx_credit = 1;
226 network_wsi = lws_http2_get_network_wsi(wsi);
227 already = network_wsi->u.http2.requested_POLLOUT;
229 /* mark everybody above him as requesting pollout */
233 wsi2->u.http2.requested_POLLOUT = 1;
234 lwsl_info("mark %p pending writable\n", wsi2);
235 wsi2 = wsi2->u.http2.parent_wsi;
238 /* for network action, act only on the network wsi */
246 if (lws_ext_callback_for_each_active(wsi,
247 LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE, NULL, 0))
250 if (wsi->position_in_fds_table < 0) {
251 lwsl_err("%s: failed to find socket %d\n", __func__, wsi->sock);
255 if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
258 lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_WRITE);
264 * libwebsocket_callback_on_writable_all_protocol() - Request a callback for
265 * all connections using the given protocol when it
266 * becomes possible to write to each socket without
269 * @protocol: Protocol whose connections will get callbacks
273 libwebsocket_callback_on_writable_all_protocol(
274 const struct libwebsocket_protocols *protocol)
276 struct libwebsocket_context *context = protocol->owning_server;
278 struct libwebsocket *wsi;
280 for (n = 0; n < context->fds_count; n++) {
281 wsi = wsi_from_fd(context,context->fds[n].fd);
284 if (wsi->protocol == protocol)
285 libwebsocket_callback_on_writable(context, wsi);