2 * libwebsockets - small server side websockets and web server implementation
4 * Copyright (C) 2010-2015 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 _lws_change_pollfd(struct lws *wsi, int _and, int _or, struct lws_pollargs *pa)
27 struct lws_context_per_thread *pt;
28 struct lws_context *context;
29 int ret = 0, pa_events = 1;
30 struct lws_pollfd *pfd;
33 if (!wsi || wsi->position_in_fds_table < 0)
36 context = wsi->context;
37 pt = &context->pt[(int)wsi->tsi];
38 assert(wsi->position_in_fds_table >= 0 &&
39 wsi->position_in_fds_table < pt->fds_count);
41 pfd = &pt->fds[wsi->position_in_fds_table];
42 pa->fd = wsi->desc.sockfd;
43 pa->prev_events = pfd->events;
44 pa->events = pfd->events = (pfd->events & ~_and) | _or;
46 //lwsl_notice("%s: wsi %p, posin %d. from %d -> %d\n", __func__, wsi, wsi->position_in_fds_table, pa->prev_events, pa->events);
49 if (wsi->http2_substream)
52 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_CHANGE_MODE_POLL_FD,
53 wsi->user_space, (void *)pa, 0)) {
58 if (_and & LWS_POLLIN) {
59 lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ);
60 lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ);
61 lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_READ);
63 if (_or & LWS_POLLIN) {
64 lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
65 lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
66 lws_libevent_io(wsi, LWS_EV_START | LWS_EV_READ);
68 if (_and & LWS_POLLOUT) {
69 lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
70 lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
71 lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
73 if (_or & LWS_POLLOUT) {
74 lws_libev_io(wsi, LWS_EV_START | LWS_EV_WRITE);
75 lws_libuv_io(wsi, LWS_EV_START | LWS_EV_WRITE);
76 lws_libevent_io(wsi, LWS_EV_START | LWS_EV_WRITE);
80 * if we changed something in this pollfd...
81 * ... and we're running in a different thread context
82 * than the service thread...
83 * ... and the service thread is waiting ...
84 * then cancel it to force a restart with our changed events
87 pa_events = pa->prev_events != pa->events;
92 if (lws_plat_change_pollfd(context, wsi, pfd)) {
93 lwsl_info("%s failed\n", __func__);
98 sampled_tid = context->service_tid;
100 tid = wsi->vhost->protocols[0].callback(wsi,
101 LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
106 if (tid != sampled_tid)
107 lws_cancel_service_pt(wsi);
114 #ifndef LWS_NO_SERVER
116 lws_accept_modulation(struct lws_context_per_thread *pt, int allow)
118 // multithread listen seems broken
120 struct lws_vhost *vh = context->vhost_list;
121 struct lws_pollargs pa1;
125 _lws_change_pollfd(pt->wsi_listening,
126 0, LWS_POLLIN, &pa1);
128 _lws_change_pollfd(pt->wsi_listening,
129 LWS_POLLIN, 0, &pa1);
137 insert_wsi_socket_into_fds(struct lws_context *context, struct lws *wsi)
139 struct lws_pollargs pa = { wsi->desc.sockfd, LWS_POLLIN, 0 };
140 struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
144 lwsl_debug("%s: %p: tsi=%d, sock=%d, pos-in-fds=%d\n",
145 __func__, wsi, wsi->tsi, wsi->desc.sockfd, pt->fds_count);
147 if ((unsigned int)pt->fds_count >= context->fd_limit_per_thread) {
148 lwsl_err("Too many fds (%d vs %d)\n", context->max_fds,
149 context->fd_limit_per_thread );
153 #if !defined(_WIN32) && !defined(LWS_WITH_ESP8266)
154 if (wsi->desc.sockfd >= context->max_fds) {
155 lwsl_err("Socket fd %d is too high (%d)\n",
156 wsi->desc.sockfd, context->max_fds);
163 assert(lws_socket_is_valid(wsi->desc.sockfd));
165 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_LOCK_POLL,
166 wsi->user_space, (void *) &pa, 1))
171 insert_wsi(context, wsi);
172 #if defined(LWS_WITH_ESP8266)
173 if (wsi->position_in_fds_table == -1)
175 wsi->position_in_fds_table = pt->fds_count;
177 // lwsl_notice("%s: %p: setting posinfds %d\n", __func__, wsi, wsi->position_in_fds_table);
179 pt->fds[wsi->position_in_fds_table].fd = wsi->desc.sockfd;
181 pt->fds[wsi->position_in_fds_table].events = LWS_POLLIN;
183 pt->fds[wsi->position_in_fds_table].events = 0; // LWS_POLLIN;
185 pa.events = pt->fds[pt->fds_count].events;
187 lws_plat_insert_socket_into_fds(context, wsi);
189 /* external POLL support via protocol 0 */
190 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_ADD_POLL_FD,
191 wsi->user_space, (void *) &pa, 0))
193 #ifndef LWS_NO_SERVER
194 /* if no more room, defeat accepts on this thread */
195 if ((unsigned int)pt->fds_count == context->fd_limit_per_thread - 1)
196 lws_accept_modulation(pt, 0);
200 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_UNLOCK_POLL,
201 wsi->user_space, (void *)&pa, 1))
208 remove_wsi_socket_from_fds(struct lws *wsi)
210 struct lws_context *context = wsi->context;
211 struct lws_pollargs pa = { wsi->desc.sockfd, 0, 0 };
212 #if !defined(LWS_WITH_ESP8266)
213 struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
219 #if !defined(_WIN32) && !defined(LWS_WITH_ESP8266)
220 if (wsi->desc.sockfd > context->max_fds) {
221 lwsl_err("fd %d too high (%d)\n", wsi->desc.sockfd, context->max_fds);
226 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_LOCK_POLL,
227 wsi->user_space, (void *)&pa, 1))
231 * detach ourselves from vh protocol list if we're on one
233 * A -> C , or, B -> C, or A -> B
235 lwsl_info("%s: removing same prot wsi %p\n", __func__, wsi);
236 if (wsi->same_vh_protocol_prev) {
237 assert (*(wsi->same_vh_protocol_prev) == wsi);
238 lwsl_info("have prev %p, setting him to our next %p\n",
239 wsi->same_vh_protocol_prev,
240 wsi->same_vh_protocol_next);
242 /* guy who pointed to us should point to our next */
243 *(wsi->same_vh_protocol_prev) = wsi->same_vh_protocol_next;
245 //lwsl_err("null wsi->prev\n");
246 /* our next should point back to our prev */
247 if (wsi->same_vh_protocol_next) {
248 wsi->same_vh_protocol_next->same_vh_protocol_prev =
249 wsi->same_vh_protocol_prev;
251 //lwsl_err("null wsi->next\n");
253 wsi->same_vh_protocol_prev = NULL;
254 wsi->same_vh_protocol_next = NULL;
256 /* the guy who is to be deleted's slot index in pt->fds */
257 m = wsi->position_in_fds_table;
259 #if !defined(LWS_WITH_ESP8266)
260 lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE | LWS_EV_PREPARE_DELETION);
261 lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE | LWS_EV_PREPARE_DELETION);
265 lwsl_debug("%s: wsi=%p, sock=%d, fds pos=%d, end guy pos=%d, endfd=%d\n",
266 __func__, wsi, wsi->desc.sockfd, wsi->position_in_fds_table,
267 pt->fds_count, pt->fds[pt->fds_count].fd);
269 /* have the last guy take up the now vacant slot */
270 pt->fds[m] = pt->fds[pt->fds_count - 1];
272 /* this decrements pt->fds_count */
273 lws_plat_delete_socket_from_fds(context, wsi, m);
274 #if !defined(LWS_WITH_ESP8266)
275 v = (int) pt->fds[m].fd;
276 /* end guy's "position in fds table" is now the deletion guy's old one */
277 end_wsi = wsi_from_fd(context, v);
279 lwsl_err("no wsi found for sock fd %d at pos %d, pt->fds_count=%d\n", (int)pt->fds[m].fd, m, pt->fds_count);
282 end_wsi->position_in_fds_table = m;
284 /* deletion guy's lws_lookup entry needs nuking */
285 delete_from_fd(context, wsi->desc.sockfd);
286 /* removed wsi has no position any more */
287 wsi->position_in_fds_table = -1;
289 /* remove also from external POLL support via protocol 0 */
290 if (lws_socket_is_valid(wsi->desc.sockfd))
291 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_DEL_POLL_FD,
292 wsi->user_space, (void *) &pa, 0))
294 #ifndef LWS_NO_SERVER
295 if (!context->being_destroyed)
296 /* if this made some room, accept connects on this thread */
297 if ((unsigned int)pt->fds_count < context->fd_limit_per_thread - 1)
298 lws_accept_modulation(pt, 1);
302 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_UNLOCK_POLL,
303 wsi->user_space, (void *) &pa, 1))
310 lws_change_pollfd(struct lws *wsi, int _and, int _or)
312 struct lws_context_per_thread *pt;
313 struct lws_context *context;
314 struct lws_pollargs pa;
317 if (!wsi || !wsi->protocol || wsi->position_in_fds_table < 0)
320 context = lws_get_context(wsi);
324 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_LOCK_POLL,
325 wsi->user_space, (void *) &pa, 0))
328 pt = &context->pt[(int)wsi->tsi];
331 ret = _lws_change_pollfd(wsi, _and, _or, &pa);
333 if (wsi->vhost->protocols[0].callback(wsi, LWS_CALLBACK_UNLOCK_POLL,
334 wsi->user_space, (void *) &pa, 0))
341 lws_callback_on_writable(struct lws *wsi)
344 struct lws *network_wsi, *wsi2;
348 if (wsi->state == LWSS_SHUTDOWN)
351 if (wsi->socket_is_permanently_unusable)
355 lwsl_info("%s: %p\n", __func__, wsi);
357 if (wsi->mode != LWSCM_HTTP2_SERVING)
360 if (wsi->u.http2.requested_POLLOUT) {
361 lwsl_info("already pending writable\n");
365 if (wsi->u.http2.tx_credit <= 0) {
367 * other side is not able to cope with us sending
368 * anything so no matter if we have POLLOUT on our side.
370 * Delay waiting for our POLLOUT until peer indicates he has
371 * space for more using tx window command in http2 layer
373 lwsl_info("%s: %p: waiting_tx_credit (%d)\n", __func__, wsi,
374 wsi->u.http2.tx_credit);
375 wsi->u.http2.waiting_tx_credit = 1;
379 network_wsi = lws_http2_get_network_wsi(wsi);
380 already = network_wsi->u.http2.requested_POLLOUT;
382 /* mark everybody above him as requesting pollout */
386 wsi2->u.http2.requested_POLLOUT = 1;
387 lwsl_info("mark %p pending writable\n", wsi2);
388 wsi2 = wsi2->u.http2.parent_wsi;
391 /* for network action, act only on the network wsi */
399 if (lws_ext_cb_active(wsi, LWS_EXT_CB_REQUEST_ON_WRITEABLE, NULL, 0))
402 if (wsi->position_in_fds_table < 0) {
403 lwsl_err("%s: failed to find socket %d\n", __func__, wsi->desc.sockfd);
407 if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
414 lws_callback_on_writable_all_protocol_vhost(const struct lws_vhost *vhost,
415 const struct lws_protocols *protocol)
419 if (protocol < vhost->protocols ||
420 protocol >= (vhost->protocols + vhost->count_protocols)) {
422 lwsl_err("%s: protocol %p is not from vhost %p (%p - %p)\n",
423 __func__, protocol, vhost->protocols, vhost,
424 (vhost->protocols + vhost->count_protocols));
429 wsi = vhost->same_vh_protocol_list[protocol - vhost->protocols];
430 //lwsl_notice("%s: protocol %p, start wsi %p\n", __func__, protocol, wsi);
432 //lwsl_notice("%s: protocol %p, this wsi %p (wsi->protocol=%p)\n",
433 // __func__, protocol, wsi, wsi->protocol);
434 assert(wsi->protocol == protocol);
435 assert(*wsi->same_vh_protocol_prev == wsi);
436 if (wsi->same_vh_protocol_next) {
437 // lwsl_err("my next says %p\n", wsi->same_vh_protocol_next);
438 // lwsl_err("my next's prev says %p\n",
439 // wsi->same_vh_protocol_next->same_vh_protocol_prev);
440 assert(wsi->same_vh_protocol_next->same_vh_protocol_prev == &wsi->same_vh_protocol_next);
442 //lwsl_notice(" apv: %p\n", wsi);
443 lws_callback_on_writable(wsi);
444 wsi = wsi->same_vh_protocol_next;
451 lws_callback_on_writable_all_protocol(const struct lws_context *context,
452 const struct lws_protocols *protocol)
454 struct lws_vhost *vhost = context->vhost_list;
458 for (n = 0; n < vhost->count_protocols; n++)
459 if (protocol->callback ==
460 vhost->protocols[n].callback &&
461 !strcmp(protocol->name, vhost->protocols[n].name))
463 if (n != vhost->count_protocols)
464 lws_callback_on_writable_all_protocol_vhost(
465 vhost, &vhost->protocols[n]);
467 vhost = vhost->vhost_next;