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_calllback_as_writeable(struct lws *wsi)
31 n = LWS_CALLBACK_CLIENT_WRITEABLE;
33 case LWSCM_WS_SERVING:
34 n = LWS_CALLBACK_SERVER_WRITEABLE;
37 n = LWS_CALLBACK_HTTP_WRITEABLE;
40 lwsl_debug("%s: %p (user=%p)\n", __func__, wsi, wsi->user_space);
41 return user_callback_handle_rxflow(wsi->protocol->callback,
42 wsi, (enum lws_callback_reasons) n,
43 wsi->user_space, NULL, 0);
47 lws_handle_POLLOUT_event(struct lws *wsi, struct lws_pollfd *pollfd)
49 int write_type = LWS_WRITE_PONG;
50 struct lws_tokens eff_buf;
57 * user callback is lowest priority to get these notifications
58 * actually, since other pending things cannot be disordered
61 /* Priority 1: pending truncated sends are incomplete ws fragments
62 * If anything else sent first the protocol would be
66 if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
67 wsi->trunc_len) < 0) {
68 lwsl_info("%s signalling to close\n", __func__);
71 /* leave POLLOUT active either way */
74 if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE)
75 return -1; /* retry closing now */
79 /* Priority 2: protocol packets
82 lwsl_info("servicing pps %d\n", wsi->pps);
84 case LWS_PPS_HTTP2_MY_SETTINGS:
85 case LWS_PPS_HTTP2_ACK_SETTINGS:
86 lws_http2_do_pps_send(lws_get_context(wsi), wsi);
91 wsi->pps = LWS_PPS_NONE;
92 lws_rx_flow_control(wsi, 1);
94 return 0; /* leave POLLOUT active */
97 /* Priority 3: pending control packets (pong or close)
99 if ((wsi->state == LWSS_ESTABLISHED &&
100 wsi->u.ws.ping_pending_flag) ||
101 (wsi->state == LWSS_RETURNED_CLOSE_ALREADY &&
102 wsi->u.ws.payload_is_close)) {
104 if (wsi->u.ws.payload_is_close)
105 write_type = LWS_WRITE_CLOSE;
107 n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
108 wsi->u.ws.ping_payload_len, write_type);
112 /* well he is sent, mark him done */
113 wsi->u.ws.ping_pending_flag = 0;
114 if (wsi->u.ws.payload_is_close)
115 /* oh... a close frame was it... then we are done */
118 /* otherwise for PING, leave POLLOUT active either way */
122 /* Priority 4: if we are closing, not allowed to send more data frags
123 * which means user callback or tx ext flush banned now
125 if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
128 /* Priority 5: Tx path extension with more to send
130 * These are handled as new fragments each time around
131 * So while we must block new writeable callback to enforce
132 * payload ordering, but since they are always complete
133 * fragments control packets can interleave OK.
135 if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
136 lwsl_ext("SERVICING TX EXT DRAINING\n");
137 if (lws_write(wsi, NULL, 0, LWS_WRITE_CONTINUATION) < 0)
139 /* leave POLLOUT active */
143 /* Priority 6: user can get the callback
145 m = lws_ext_cb_active(wsi, LWS_EXT_CB_IS_WRITEABLE, NULL, 0);
146 #ifndef LWS_NO_EXTENSIONS
147 if (!wsi->extension_data_pending)
151 * check in on the active extensions, see if they
152 * had pending stuff to spill... they need to get the
153 * first look-in otherwise sequence will be disordered
155 * NULL, zero-length eff_buf means just spill pending
161 /* default to nobody has more to spill */
164 eff_buf.token = NULL;
165 eff_buf.token_len = 0;
167 /* give every extension a chance to spill */
169 m = lws_ext_cb_active(wsi,
170 LWS_EXT_CB_PACKET_TX_PRESEND,
173 lwsl_err("ext reports fatal error\n");
178 * at least one extension told us he has more
179 * to spill, so we will go around again after
183 /* assuming they gave us something to send, send it */
185 if (eff_buf.token_len) {
186 n = lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
189 lwsl_info("closing from POLLOUT spill\n");
193 * Keep amount spilled small to minimize chance of this
195 if (n != eff_buf.token_len) {
196 lwsl_err("Unable to spill ext %d vs %s\n",
197 eff_buf.token_len, n);
203 /* no extension has more to spill */
209 * There's more to spill from an extension, but we just sent
210 * something... did that leave the pipe choked?
213 if (!lws_send_pipe_choked(wsi))
214 /* no we could add more */
217 lwsl_info("choked in POLLOUT service\n");
220 * Yes, he's choked. Leave the POLLOUT masked on so we will
221 * come back here when he is unchoked. Don't call the user
222 * callback to enforce ordering of spilling, he'll get called
223 * when we come back here and there's nothing more to spill.
228 #ifndef LWS_NO_EXTENSIONS
229 wsi->extension_data_pending = 0;
235 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
236 lwsl_info("failed at set pollfd\n");
240 if (!wsi->hdr_parsing_completed)
245 * we are the 'network wsi' for potentially many muxed child wsi with
246 * no network connection of their own, who have to use us for all their
247 * network actions. So we use a round-robin scheme to share out the
248 * POLLOUT notifications to our children.
250 * But because any child could exhaust the socket's ability to take
251 * writes, we can only let one child get notified each time.
253 * In addition children may be closed / deleted / added between POLLOUT
254 * notifications, so we can't hold pointers
257 if (wsi->mode != LWSCM_HTTP2_SERVING) {
258 lwsl_info("%s: non http2\n", __func__);
262 wsi->u.http2.requested_POLLOUT = 0;
263 if (!wsi->u.http2.initialized) {
264 lwsl_info("pollout on uninitialized http2 conn\n");
268 lwsl_info("%s: doing children\n", __func__);
272 wsi2 = wsi2->u.http2.next_child_wsi;
273 lwsl_info("%s: child %p\n", __func__, wsi2);
276 if (!wsi2->u.http2.requested_POLLOUT)
278 wsi2->u.http2.requested_POLLOUT = 0;
279 if (lws_calllback_as_writeable(wsi2)) {
280 lwsl_debug("Closing POLLOUT child\n");
281 lws_close_free_wsi(wsi2, LWS_CLOSE_STATUS_NOSTATUS);
284 } while (wsi2 != NULL && !lws_send_pipe_choked(wsi));
286 lwsl_info("%s: completed\n", __func__);
291 return lws_calllback_as_writeable(wsi);
295 lws_service_timeout_check(struct lws *wsi, unsigned int sec)
297 struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
300 * if extensions want in on it (eg, we are a mux parent)
301 * give them a chance to service child timeouts
303 if (lws_ext_cb_active(wsi, LWS_EXT_CB_1HZ, NULL, sec) < 0)
306 if (!wsi->pending_timeout)
310 * if we went beyond the allowed time, kill the
313 if ((time_t)sec > wsi->pending_timeout_limit) {
315 lwsl_notice("wsi %p: TIMEDOUT WAITING on %d (did hdr %d, ah %p, wl %d, pfd events %d)\n",
316 (void *)wsi, wsi->pending_timeout,
317 wsi->hdr_parsing_completed, wsi->u.hdr.ah,
318 pt->ah_wait_list_length,
319 pt->fds[wsi->sock].events);
322 * Since he failed a timeout, he already had a chance to do
323 * something and was unable to... that includes situations like
324 * half closed connections. So process this "failed timeout"
325 * close as a violent death and don't try to do protocol
326 * cleanup like flush partials.
328 wsi->socket_is_permanently_unusable = 1;
329 lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
337 int lws_rxflow_cache(struct lws *wsi, unsigned char *buf, int n, int len)
339 /* his RX is flowcontrolled, don't send remaining now */
340 if (wsi->rxflow_buffer) {
341 /* rxflow while we were spilling prev rxflow */
342 lwsl_info("stalling in existing rxflow buf\n");
346 /* a new rxflow, buffer it and warn caller */
347 lwsl_info("new rxflow input buffer len %d\n", len - n);
348 wsi->rxflow_buffer = lws_malloc(len - n);
349 wsi->rxflow_len = len - n;
351 memcpy(wsi->rxflow_buffer, buf + n, len - n);
356 /* this is used by the platform service code to stop us waiting for network
357 * activity in poll() when we have something that already needs service
361 lws_service_adjust_timeout(struct lws_context *context, int timeout_ms, int tsi)
363 struct lws_context_per_thread *pt = &context->pt[tsi];
366 /* Figure out if we really want to wait in poll()
367 * We only need to wait if really nothing already to do and we have
368 * to wait for something from network
371 /* 1) if we know we are draining rx ext, do not wait in poll */
372 if (pt->rx_draining_ext_list)
375 #ifdef LWS_OPENSSL_SUPPORT
376 /* 2) if we know we have non-network pending data, do not wait in poll */
377 if (lws_ssl_anybody_has_buffered_read_tsi(context, tsi)) {
379 lwsl_err("ssl buffered read\n");
383 /* 3) if any ah has pending rx, do not wait in poll */
384 for (n = 0; n < context->max_http_header_pool; n++)
385 if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen) {
386 /* any ah with pending rx must be attached to someone */
387 assert(pt->ah_pool[n].wsi);
396 * guys that need POLLIN service again without waiting for network action
397 * can force POLLIN here if not flowcontrolled, so they will get service.
399 * Return nonzero if anybody got their POLLIN faked
402 lws_service_flag_pending(struct lws_context *context, int tsi)
404 struct lws_context_per_thread *pt = &context->pt[tsi];
405 #ifdef LWS_OPENSSL_SUPPORT
406 struct lws *wsi_next;
415 * 1) For all guys with already-available ext data to drain, if they are
416 * not flowcontrolled, fake their POLLIN status
418 wsi = pt->rx_draining_ext_list;
420 pt->fds[wsi->position_in_fds_table].revents |=
421 pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
422 if (pt->fds[wsi->position_in_fds_table].revents &
425 wsi = wsi->u.ws.rx_draining_ext_list;
428 #ifdef LWS_OPENSSL_SUPPORT
430 * 2) For all guys with buffered SSL read data already saved up, if they
431 * are not flowcontrolled, fake their POLLIN status so they'll get
432 * service to use up the buffered incoming data, even though their
433 * network socket may have nothing
435 wsi = pt->pending_read_list;
437 wsi_next = wsi->pending_read_list_next;
438 pt->fds[wsi->position_in_fds_table].revents |=
439 pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
440 if (pt->fds[wsi->position_in_fds_table].revents & LWS_POLLIN) {
443 * he's going to get serviced now, take him off the
444 * list of guys with buffered SSL. If he still has some
445 * at the end of the service, he'll get put back on the
448 lws_ssl_remove_wsi_from_buffered_list(wsi);
455 * 3) For any wsi who have an ah with pending RX who did not
456 * complete their current headers, and are not flowcontrolled,
457 * fake their POLLIN status so they will be able to drain the
458 * rx buffered in the ah
460 for (n = 0; n < context->max_http_header_pool; n++)
461 if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen &&
462 !pt->ah_pool[n].wsi->hdr_parsing_completed) {
463 pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents |=
464 pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].events &
466 if (pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents &
475 * lws_service_fd() - Service polled socket with something waiting
476 * @context: Websocket context
477 * @pollfd: The pollfd entry describing the socket fd and which events
480 * This function takes a pollfd that has POLLIN or POLLOUT activity and
481 * services it according to the state of the associated
484 * The one call deals with all "service" that might happen on a socket
485 * including listen accepts, http files as well as websocket protocol.
487 * If a pollfd says it has something, you can just pass it to
488 * lws_service_fd() whether it is a socket handled by lws or not.
489 * If it sees it is a lws socket, the traffic will be handled and
490 * pollfd->revents will be zeroed now.
492 * If the socket is foreign to lws, it leaves revents alone. So you can
493 * see if you should service yourself by checking the pollfd revents
494 * after letting lws try to service it.
498 lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd, int tsi)
500 struct lws_context_per_thread *pt = &context->pt[tsi];
501 lws_sockfd_type our_fd = 0, tmp_fd;
502 struct lws_tokens eff_buf;
503 unsigned int pending = 0;
504 struct lws *wsi, *wsi1;
505 char draining_flow = 0;
512 * you can call us with pollfd = NULL to just allow the once-per-second
513 * global timeout checks; if less than a second since the last check
514 * it returns immediately then.
519 /* TODO: if using libev, we should probably use timeout watchers... */
520 if (context->last_timeout_check_s != now) {
521 context->last_timeout_check_s = now;
523 lws_plat_service_periodic(context);
525 /* global timeout check once per second */
530 wsi = context->pt[tsi].timeout_list;
532 /* we have to take copies, because he may be deleted */
533 wsi1 = wsi->timeout_list;
535 if (lws_service_timeout_check(wsi, (unsigned int)now)) {
536 /* he did time out... */
537 if (tmp_fd == our_fd)
538 /* it was the guy we came to service! */
540 /* he's gone, no need to mark as handled */
545 lws_cgi_kill_terminated(pt);
551 for (n = 0; n < context->count_threads; n++)
552 p += sprintf(p, " %7lu (%5d), ",
553 context->pt[n].count_conns,
554 context->pt[n].fds_count);
556 lwsl_notice("load: %s\n", s);
561 /* the socket we came to service timed out, nothing to do */
565 /* just here for timeout management? */
569 /* no, here to service a socket descriptor */
570 wsi = wsi_from_fd(context, pollfd->fd);
572 /* not lws connection ... leave revents alone and return */
576 * so that caller can tell we handled, past here we need to
577 * zero down pollfd->revents after handling
581 /* handle session socket closed */
583 if ((!(pollfd->revents & pollfd->events & LWS_POLLIN)) &&
584 (pollfd->revents & LWS_POLLHUP)) {
585 wsi->socket_is_permanently_unusable = 1;
586 lwsl_debug("Session Socket %p (fd=%d) dead\n",
587 (void *)wsi, pollfd->fd);
589 goto close_and_handled;
593 if (pollfd->revents & LWS_POLLOUT)
594 wsi->sock_send_blocking = FALSE;
599 lwsl_debug("fd=%d, revents=%d\n", pollfd->fd, pollfd->revents);
601 /* okay, what we came here to do... */
604 case LWSCM_HTTP_SERVING:
605 case LWSCM_HTTP_CLIENT:
606 case LWSCM_HTTP_SERVING_ACCEPTED:
607 case LWSCM_SERVER_LISTENER:
608 case LWSCM_SSL_ACK_PENDING:
609 if (wsi->state == LWSS_CLIENT_HTTP_ESTABLISHED) {
612 n = lws_server_socket_service(context, wsi, pollfd);
613 if (n) /* closed by above */
615 pending = lws_ssl_pending(wsi);
620 case LWSCM_WS_SERVING:
621 case LWSCM_WS_CLIENT:
622 case LWSCM_HTTP2_SERVING:
623 case LWSCM_HTTP_CLIENT_ACCEPTED:
625 /* 1: something requested a callback when it was OK to write */
627 if ((pollfd->revents & LWS_POLLOUT) &&
628 (wsi->state == LWSS_ESTABLISHED ||
629 wsi->state == LWSS_HTTP2_ESTABLISHED ||
630 wsi->state == LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS ||
631 wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
632 wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) &&
633 lws_handle_POLLOUT_event(wsi, pollfd)) {
634 if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
635 wsi->state = LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE;
636 lwsl_info("lws_service_fd: closing\n");
637 goto close_and_handled;
640 if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
641 wsi->state == LWSS_AWAITING_CLOSE_ACK) {
643 * we stopped caring about anything except control
644 * packets. Force flow control off, defeat tx
647 lws_rx_flow_control(wsi, 1);
648 wsi->u.ws.tx_draining_ext = 0;
651 if (wsi->u.ws.tx_draining_ext)
652 /* we cannot deal with new RX until the TX ext
653 * path has been drained. It's because new
654 * rx will, eg, crap on the wsi rx buf that
655 * may be needed to retain state.
657 * TX ext drain path MUST go through event loop
662 if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
663 /* We cannot deal with any kind of new RX
664 * because we are RX-flowcontrolled.
668 /* 2: RX Extension needs to be drained
671 if (wsi->state == LWSS_ESTABLISHED &&
672 wsi->u.ws.rx_draining_ext) {
674 lwsl_ext("%s: RX EXT DRAINING: Service\n", __func__);
675 #ifndef LWS_NO_CLIENT
676 if (wsi->mode == LWSCM_WS_CLIENT) {
677 n = lws_client_rx_sm(wsi, 0);
683 n = lws_rx_sm(wsi, 0);
688 if (wsi->u.ws.rx_draining_ext)
690 * We have RX EXT content to drain, but can't do it
691 * right now. That means we cannot do anything lower
696 /* 3: RX Flowcontrol buffer needs to be drained
699 if (wsi->rxflow_buffer) {
700 lwsl_info("draining rxflow (len %d)\n",
701 wsi->rxflow_len - wsi->rxflow_pos
704 eff_buf.token = (char *)wsi->rxflow_buffer +
706 eff_buf.token_len = wsi->rxflow_len - wsi->rxflow_pos;
711 /* 4: any incoming (or ah-stashed incoming rx) data ready?
712 * notice if rx flow going off raced poll(), rx flow wins
715 if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
719 /* all the union members start with hdr, so even in ws mode
720 * we can deal with the ah via u.hdr
723 lwsl_err("%s: %p: using inherited ah rx\n", __func__, wsi);
724 eff_buf.token_len = wsi->u.hdr.ah->rxlen -
725 wsi->u.hdr.ah->rxpos;
726 eff_buf.token = (char *)wsi->u.hdr.ah->rx +
727 wsi->u.hdr.ah->rxpos;
730 eff_buf.token_len = lws_ssl_capable_read(wsi, pt->serv_buf,
731 pending ? pending : LWS_MAX_SOCKET_IO_BUF);
732 switch (eff_buf.token_len) {
734 lwsl_info("service_fd: closing due to 0 length read\n");
735 goto close_and_handled;
736 case LWS_SSL_CAPABLE_MORE_SERVICE:
737 lwsl_info("SSL Capable more service\n");
740 case LWS_SSL_CAPABLE_ERROR:
741 lwsl_info("Closing when error\n");
742 goto close_and_handled;
745 eff_buf.token = (char *)pt->serv_buf;
749 * give any active extensions a chance to munge the buffer
750 * before parse. We pass in a pointer to an lws_tokens struct
751 * prepared with the default buffer and content length that's in
752 * there. Rather than rewrite the default buffer, extensions
753 * that expect to grow the buffer can adapt .token to
754 * point to their own per-connection buffer in the extension
755 * user allocation. By default with no extensions or no
756 * extension callback handling, just the normal input buffer is
757 * used then so it is efficient.
760 if (wsi->mode == LWSCM_HTTP_CLIENT_ACCEPTED) {
761 lwsl_notice("%s: calling LWS_CALLBACK_RECEIVE_CLIENT_HTTP, "
762 "rem %d len %d\n", __func__,
763 wsi->u.http.content_remain, eff_buf.token_len);
764 if (wsi->u.http.content_remain < eff_buf.token_len)
765 n = wsi->u.http.content_remain;
767 n = eff_buf.token_len;
768 if (user_callback_handle_rxflow(wsi->protocol->callback,
769 wsi, LWS_CALLBACK_RECEIVE_CLIENT_HTTP,
770 wsi->user_space, (void *)eff_buf.token,
772 goto close_and_handled;
773 wsi->u.http.content_remain -= n;
774 if (wsi->u.http.content_remain)
777 lwsl_notice("%s: client http receved all content\n",
779 if (user_callback_handle_rxflow(wsi->protocol->callback,
780 wsi, LWS_CALLBACK_COMPLETED_CLIENT_HTTP,
781 wsi->user_space, NULL, 0))
782 goto close_and_handled;
784 if (wsi->u.http.connection_type == HTTP_CONNECTION_CLOSE)
785 goto close_and_handled;
791 m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_RX_PREPARSE,
794 goto close_and_handled;
798 /* service incoming data */
800 if (eff_buf.token_len) {
802 * if draining from rxflow buffer, not
803 * critical to track what was used since at the
804 * use it bumps wsi->rxflow_pos. If we come
805 * around again it will pick up from where it
808 n = lws_read(wsi, (unsigned char *)eff_buf.token,
817 eff_buf.token = NULL;
818 eff_buf.token_len = 0;
822 lwsl_err("%s: %p: detaching inherited used ah\n",
824 /* show we used all the pending rx up */
825 wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
826 /* we can run the normal ah detach flow despite
827 * being in ws union mode, since all union members
829 lws_header_table_detach(wsi, 0);
832 pending = lws_ssl_pending(wsi);
835 pending = pending > LWS_MAX_SOCKET_IO_BUF ?
836 LWS_MAX_SOCKET_IO_BUF : pending;
840 if (draining_flow && wsi->rxflow_buffer &&
841 wsi->rxflow_pos == wsi->rxflow_len) {
842 lwsl_info("flow buffer: drained\n");
843 lws_free_set_NULL(wsi->rxflow_buffer);
844 /* having drained the rxflow buffer, can rearm POLLIN */
848 _lws_rx_flow_control(wsi);
849 /* n ignored, needed for NO_SERVER case */
854 case LWSCM_CGI: /* we exist to handle a cgi's stdin/out/err data...
855 * do the callback on our master wsi
858 struct lws_cgi_args args;
860 if (wsi->cgi_channel >= LWS_STDOUT &&
861 !(pollfd->revents & pollfd->events & LWS_POLLIN))
863 if (wsi->cgi_channel == LWS_STDIN &&
864 !(pollfd->revents & pollfd->events & LWS_POLLOUT))
867 if (wsi->cgi_channel == LWS_STDIN)
868 if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
869 lwsl_info("failed at set pollfd\n");
873 args.ch = wsi->cgi_channel;
874 args.stdwsi = &wsi->parent->cgi->stdwsi[0];
876 if (user_callback_handle_rxflow(
877 wsi->parent->protocol->callback,
878 wsi->parent, LWS_CALLBACK_CGI,
879 wsi->parent->user_space,
890 n = lws_client_socket_service(context, wsi, pollfd);
901 lwsl_debug("Close and handled\n");
902 lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
904 * pollfd may point to something else after the close
905 * due to pollfd swapping scheme on delete on some platforms
906 * we can't clear revents now because it'd be the wrong guy's revents
916 lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd)
918 return lws_service_fd_tsi(context, pollfd, 0);
922 * lws_service() - Service any pending websocket activity
923 * @context: Websocket context
924 * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed
925 * service otherwise block and service immediately, returning
926 * after the timeout if nothing needed service.
928 * This function deals with any pending websocket traffic, for three
929 * kinds of event. It handles these events on both server and client
930 * types of connection the same.
932 * 1) Accept new connections to our context's server
934 * 2) Call the receive callback for incoming frame data received by
935 * server or client connections.
937 * You need to call this service function periodically to all the above
938 * functions to happen; if your application is single-threaded you can
939 * just call it in your main event loop.
941 * Alternatively you can fork a new process that asynchronously handles
942 * calling this service in a loop. In that case you are happy if this
943 * call blocks your thread until it needs to take care of something and
944 * would call it with a large nonzero timeout. Your loop then takes no
945 * CPU while there is nothing happening.
947 * If you are calling it in a single-threaded app, you don't want it to
948 * wait around blocking other things in your loop from happening, so you
949 * would call it with a timeout_ms of 0, so it returns immediately if
950 * nothing is pending, or as soon as it services whatever was pending.
954 lws_service(struct lws_context *context, int timeout_ms)
956 return lws_plat_service(context, timeout_ms);
960 lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
962 return lws_plat_service_tsi(context, timeout_ms, tsi);