/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2015 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
static int
lws_calllback_as_writeable(struct lws *wsi)
{
int n;
switch (wsi->mode) {
case LWSCM_WS_CLIENT:
n = LWS_CALLBACK_CLIENT_WRITEABLE;
break;
case LWSCM_WS_SERVING:
n = LWS_CALLBACK_SERVER_WRITEABLE;
break;
default:
n = LWS_CALLBACK_HTTP_WRITEABLE;
break;
}
lwsl_debug("%s: %p (user=%p)\n", __func__, wsi, wsi->user_space);
return user_callback_handle_rxflow(wsi->protocol->callback,
wsi, (enum lws_callback_reasons) n,
wsi->user_space, NULL, 0);
}
int
lws_handle_POLLOUT_event(struct lws *wsi, struct lws_pollfd *pollfd)
{
int write_type = LWS_WRITE_PONG;
struct lws_tokens eff_buf;
#ifdef LWS_USE_HTTP2
struct lws *wsi2;
#endif
int ret, m, n;
/*
* user callback is lowest priority to get these notifications
* actually, since other pending things cannot be disordered
*/
/* Priority 1: pending truncated sends are incomplete ws fragments
* If anything else sent first the protocol would be
* corrupted.
*/
if (wsi->trunc_len) {
if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
wsi->trunc_len) < 0) {
lwsl_info("%s signalling to close\n", __func__);
return -1;
}
/* leave POLLOUT active either way */
return 0;
} else
if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE)
return -1; /* retry closing now */
#ifdef LWS_USE_HTTP2
/* Priority 2: protocol packets
*/
if (wsi->pps) {
lwsl_info("servicing pps %d\n", wsi->pps);
switch (wsi->pps) {
case LWS_PPS_HTTP2_MY_SETTINGS:
case LWS_PPS_HTTP2_ACK_SETTINGS:
lws_http2_do_pps_send(lws_get_context(wsi), wsi);
break;
default:
break;
}
wsi->pps = LWS_PPS_NONE;
lws_rx_flow_control(wsi, 1);
return 0; /* leave POLLOUT active */
}
#endif
/* Priority 3: pending control packets (pong or close)
*/
if ((wsi->state == LWSS_ESTABLISHED &&
wsi->u.ws.ping_pending_flag) ||
(wsi->state == LWSS_RETURNED_CLOSE_ALREADY &&
wsi->u.ws.payload_is_close)) {
if (wsi->u.ws.payload_is_close)
write_type = LWS_WRITE_CLOSE;
n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
wsi->u.ws.ping_payload_len, write_type);
if (n < 0)
return -1;
/* well he is sent, mark him done */
wsi->u.ws.ping_pending_flag = 0;
if (wsi->u.ws.payload_is_close)
/* oh... a close frame was it... then we are done */
return -1;
/* otherwise for PING, leave POLLOUT active either way */
return 0;
}
/* Priority 4: if we are closing, not allowed to send more data frags
* which means user callback or tx ext flush banned now
*/
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
goto user_service;
/* Priority 5: Tx path extension with more to send
*
* These are handled as new fragments each time around
* So while we must block new writeable callback to enforce
* payload ordering, but since they are always complete
* fragments control packets can interleave OK.
*/
if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
lwsl_ext("SERVICING TX EXT DRAINING\n");
if (lws_write(wsi, NULL, 0, LWS_WRITE_CONTINUATION) < 0)
return -1;
/* leave POLLOUT active */
return 0;
}
/* Priority 6: user can get the callback
*/
m = lws_ext_cb_active(wsi, LWS_EXT_CB_IS_WRITEABLE, NULL, 0);
#ifndef LWS_NO_EXTENSIONS
if (!wsi->extension_data_pending)
goto user_service;
#endif
/*
* check in on the active extensions, see if they
* had pending stuff to spill... they need to get the
* first look-in otherwise sequence will be disordered
*
* NULL, zero-length eff_buf means just spill pending
*/
ret = 1;
while (ret == 1) {
/* default to nobody has more to spill */
ret = 0;
eff_buf.token = NULL;
eff_buf.token_len = 0;
/* give every extension a chance to spill */
m = lws_ext_cb_active(wsi,
LWS_EXT_CB_PACKET_TX_PRESEND,
&eff_buf, 0);
if (m < 0) {
lwsl_err("ext reports fatal error\n");
return -1;
}
if (m)
/*
* at least one extension told us he has more
* to spill, so we will go around again after
*/
ret = 1;
/* assuming they gave us something to send, send it */
if (eff_buf.token_len) {
n = lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
lwsl_info("closing from POLLOUT spill\n");
return -1;
}
/*
* Keep amount spilled small to minimize chance of this
*/
if (n != eff_buf.token_len) {
lwsl_err("Unable to spill ext %d vs %s\n",
eff_buf.token_len, n);
return -1;
}
} else
continue;
/* no extension has more to spill */
if (!ret)
continue;
/*
* There's more to spill from an extension, but we just sent
* something... did that leave the pipe choked?
*/
if (!lws_send_pipe_choked(wsi))
/* no we could add more */
continue;
lwsl_info("choked in POLLOUT service\n");
/*
* Yes, he's choked. Leave the POLLOUT masked on so we will
* come back here when he is unchoked. Don't call the user
* callback to enforce ordering of spilling, he'll get called
* when we come back here and there's nothing more to spill.
*/
return 0;
}
#ifndef LWS_NO_EXTENSIONS
wsi->extension_data_pending = 0;
#endif
user_service:
/* one shot */
if (pollfd)
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
#ifdef LWS_USE_HTTP2
/*
* we are the 'network wsi' for potentially many muxed child wsi with
* no network connection of their own, who have to use us for all their
* network actions. So we use a round-robin scheme to share out the
* POLLOUT notifications to our children.
*
* But because any child could exhaust the socket's ability to take
* writes, we can only let one child get notified each time.
*
* In addition children may be closed / deleted / added between POLLOUT
* notifications, so we can't hold pointers
*/
if (wsi->mode != LWSCM_HTTP2_SERVING) {
lwsl_info("%s: non http2\n", __func__);
goto notify;
}
wsi->u.http2.requested_POLLOUT = 0;
if (!wsi->u.http2.initialized) {
lwsl_info("pollout on uninitialized http2 conn\n");
return 0;
}
lwsl_info("%s: doing children\n", __func__);
wsi2 = wsi;
do {
wsi2 = wsi2->u.http2.next_child_wsi;
lwsl_info("%s: child %p\n", __func__, wsi2);
if (!wsi2)
continue;
if (!wsi2->u.http2.requested_POLLOUT)
continue;
wsi2->u.http2.requested_POLLOUT = 0;
if (lws_calllback_as_writeable(wsi2)) {
lwsl_debug("Closing POLLOUT child\n");
lws_close_free_wsi(wsi2, LWS_CLOSE_STATUS_NOSTATUS);
}
wsi2 = wsi;
} while (wsi2 != NULL && !lws_send_pipe_choked(wsi));
lwsl_info("%s: completed\n", __func__);
return 0;
notify:
#endif
return lws_calllback_as_writeable(wsi);
}
int
lws_service_timeout_check(struct lws *wsi, unsigned int sec)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
struct lws **pwsi;
/*
* if extensions want in on it (eg, we are a mux parent)
* give them a chance to service child timeouts
*/
if (lws_ext_cb_active(wsi, LWS_EXT_CB_1HZ, NULL, sec) < 0)
return 0;
if (!wsi->pending_timeout)
return 0;
/*
* if we went beyond the allowed time, kill the
* connection
*/
if ((time_t)sec > wsi->pending_timeout_limit) {
#if LWS_POSIX
lwsl_notice("wsi %p: TIMEDOUT WAITING on %d (did hdr %d, ah %p, wl %d, pfd events %d)\n",
(void *)wsi, wsi->pending_timeout,
wsi->hdr_parsing_completed, wsi->u.hdr.ah,
pt->ah_wait_list_length,
pt->fds[wsi->sock].events);
#endif
lws_pt_lock(pt);
pwsi = &pt->ah_wait_list;
if (!pwsi)
return 0;
while (*pwsi) {
if (*pwsi == wsi)
break;
pwsi = &(*pwsi)->u.hdr.ah_wait_list;
lwsl_err("%s: pwsi=%p\n", __func__, pwsi);
}
lws_pt_unlock(pt);
if (!*pwsi)
lwsl_err("*** not on ah wait list ***\n");
/*
* Since he failed a timeout, he already had a chance to do
* something and was unable to... that includes situations like
* half closed connections. So process this "failed timeout"
* close as a violent death and don't try to do protocol
* cleanup like flush partials.
*/
wsi->socket_is_permanently_unusable = 1;
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
return 0;
}
int lws_rxflow_cache(struct lws *wsi, unsigned char *buf, int n, int len)
{
/* his RX is flowcontrolled, don't send remaining now */
if (wsi->rxflow_buffer) {
/* rxflow while we were spilling prev rxflow */
lwsl_info("stalling in existing rxflow buf\n");
return 1;
}
/* a new rxflow, buffer it and warn caller */
lwsl_info("new rxflow input buffer len %d\n", len - n);
wsi->rxflow_buffer = lws_malloc(len - n);
wsi->rxflow_len = len - n;
wsi->rxflow_pos = 0;
memcpy(wsi->rxflow_buffer, buf + n, len - n);
return 0;
}
/* this is used by the platform service code to stop us waiting for network
* activity in poll() when we have something that already needs service
*/
int
lws_service_adjust_timeout(struct lws_context *context, int timeout_ms, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
int n;
/* Figure out if we really want to wait in poll()
* We only need to wait if really nothing already to do and we have
* to wait for something from network
*/
/* 1) if we know we are draining rx ext, do not wait in poll */
if (pt->rx_draining_ext_list)
timeout_ms = 0;
#ifdef LWS_OPENSSL_SUPPORT
/* 2) if we know we have non-network pending data, do not wait in poll */
if (lws_ssl_anybody_has_buffered_read_tsi(context, tsi)) {
timeout_ms = 0;
lwsl_err("ssl buffered read\n");
}
#endif
/* 3) if any ah has pending rx, do not wait in poll */
for (n = 0; n < context->max_http_header_pool; n++)
if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen) {
/* any ah with pending rx must be attached to someone */
assert(pt->ah_pool[n].wsi);
timeout_ms = 0;
break;
}
return timeout_ms;
}
/*
* guys that need POLLIN service again without waiting for network action
* can force POLLIN here if not flowcontrolled, so they will get service.
*
* Return nonzero if anybody got their POLLIN faked
*/
int
lws_service_flag_pending(struct lws_context *context, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
#ifdef LWS_OPENSSL_SUPPORT
struct lws *wsi_next;
#endif
struct lws *wsi;
int forced = 0;
int n;
/* POLLIN faking */
/*
* 1) For all guys with already-available ext data to drain, if they are
* not flowcontrolled, fake their POLLIN status
*/
wsi = pt->rx_draining_ext_list;
while (wsi) {
pt->fds[wsi->position_in_fds_table].revents |=
pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
if (pt->fds[wsi->position_in_fds_table].revents &
LWS_POLLIN)
forced = 1;
wsi = wsi->u.ws.rx_draining_ext_list;
}
#ifdef LWS_OPENSSL_SUPPORT
/*
* 2) For all guys with buffered SSL read data already saved up, if they
* are not flowcontrolled, fake their POLLIN status so they'll get
* service to use up the buffered incoming data, even though their
* network socket may have nothing
*/
wsi = pt->pending_read_list;
while (wsi) {
wsi_next = wsi->pending_read_list_next;
pt->fds[wsi->position_in_fds_table].revents |=
pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
if (pt->fds[wsi->position_in_fds_table].revents & LWS_POLLIN) {
forced = 1;
/*
* he's going to get serviced now, take him off the
* list of guys with buffered SSL. If he still has some
* at the end of the service, he'll get put back on the
* list then.
*/
lws_ssl_remove_wsi_from_buffered_list(wsi);
}
wsi = wsi_next;
}
#endif
/*
* 3) For any wsi who have an ah with pending RX who did not
* complete their current headers, and are not flowcontrolled,
* fake their POLLIN status so they will be able to drain the
* rx buffered in the ah
*/
for (n = 0; n < context->max_http_header_pool; n++)
if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen &&
!pt->ah_pool[n].wsi->hdr_parsing_completed) {
pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents |=
pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].events &
LWS_POLLIN;
if (pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents &
LWS_POLLIN)
forced = 1;
}
return forced;
}
/**
* lws_service_fd() - Service polled socket with something waiting
* @context: Websocket context
* @pollfd: The pollfd entry describing the socket fd and which events
* happened.
*
* This function takes a pollfd that has POLLIN or POLLOUT activity and
* services it according to the state of the associated
* struct lws.
*
* The one call deals with all "service" that might happen on a socket
* including listen accepts, http files as well as websocket protocol.
*
* If a pollfd says it has something, you can just pass it to
* lws_service_fd() whether it is a socket handled by lws or not.
* If it sees it is a lws socket, the traffic will be handled and
* pollfd->revents will be zeroed now.
*
* If the socket is foreign to lws, it leaves revents alone. So you can
* see if you should service yourself by checking the pollfd revents
* after letting lws try to service it.
*/
LWS_VISIBLE int
lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
lws_sockfd_type our_fd = 0, tmp_fd;
struct lws_tokens eff_buf;
unsigned int pending = 0;
struct lws *wsi, *wsi1;
char draining_flow = 0;
int timed_out = 0;
time_t now;
int n, m;
int more;
/*
* you can call us with pollfd = NULL to just allow the once-per-second
* global timeout checks; if less than a second since the last check
* it returns immediately then.
*/
time(&now);
/* TODO: if using libev, we should probably use timeout watchers... */
if (context->last_timeout_check_s != now) {
context->last_timeout_check_s = now;
lws_plat_service_periodic(context);
/* global timeout check once per second */
if (pollfd)
our_fd = pollfd->fd;
wsi = context->pt[tsi].timeout_list;
while (wsi) {
/* we have to take copies, because he may be deleted */
wsi1 = wsi->timeout_list;
tmp_fd = wsi->sock;
if (lws_service_timeout_check(wsi, (unsigned int)now)) {
/* he did time out... */
if (tmp_fd == our_fd)
/* it was the guy we came to service! */
timed_out = 1;
/* he's gone, no need to mark as handled */
}
wsi = wsi1;
}
#if 0
{
char s[300], *p = s;
for (n = 0; n < context->count_threads; n++)
p += sprintf(p, " %7lu (%5d), ",
context->pt[n].count_conns,
context->pt[n].fds_count);
lwsl_notice("load: %s\n", s);
}
#endif
}
/* the socket we came to service timed out, nothing to do */
if (timed_out)
return 0;
/* just here for timeout management? */
if (!pollfd)
return 0;
/* no, here to service a socket descriptor */
wsi = wsi_from_fd(context, pollfd->fd);
if (!wsi)
/* not lws connection ... leave revents alone and return */
return 0;
/*
* so that caller can tell we handled, past here we need to
* zero down pollfd->revents after handling
*/
#if LWS_POSIX
/* handle session socket closed */
if ((!(pollfd->revents & pollfd->events & LWS_POLLIN)) &&
(pollfd->revents & LWS_POLLHUP)) {
wsi->socket_is_permanently_unusable = 1;
lwsl_debug("Session Socket %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
goto close_and_handled;
}
#ifdef _WIN32
if (pollfd->revents & LWS_POLLOUT)
wsi->sock_send_blocking = FALSE;
#endif
#endif
/* okay, what we came here to do... */
switch (wsi->mode) {
case LWSCM_HTTP_SERVING:
case LWSCM_HTTP_SERVING_ACCEPTED:
case LWSCM_SERVER_LISTENER:
case LWSCM_SSL_ACK_PENDING:
n = lws_server_socket_service(context, wsi, pollfd);
if (n) /* closed by above */
return 1;
pending = lws_ssl_pending(wsi);
if (pending)
goto handle_pending;
goto handled;
case LWSCM_WS_SERVING:
case LWSCM_WS_CLIENT:
case LWSCM_HTTP2_SERVING:
/* 1: something requested a callback when it was OK to write */
if ((pollfd->revents & LWS_POLLOUT) &&
(wsi->state == LWSS_ESTABLISHED ||
wsi->state == LWSS_HTTP2_ESTABLISHED ||
wsi->state == LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS ||
wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) &&
lws_handle_POLLOUT_event(wsi, pollfd)) {
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
wsi->state = LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE;
lwsl_info("lws_service_fd: closing\n");
goto close_and_handled;
}
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
wsi->state == LWSS_AWAITING_CLOSE_ACK) {
/*
* we stopped caring about anything except control
* packets. Force flow control off, defeat tx
* draining.
*/
lws_rx_flow_control(wsi, 1);
wsi->u.ws.tx_draining_ext = 0;
}
if (wsi->u.ws.tx_draining_ext) {
/* we cannot deal with new RX until the TX ext
* path has been drained. It's because new
* rx will, eg, crap on the wsi rx buf that
* may be needed to retain state.
*
* TX ext drain path MUST go through event loop
* to avoid blocking.
*/
break;
}
if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
/* We cannot deal with any kind of new RX
* because we are RX-flowcontrolled.
*/
break;
/* 2: RX Extension needs to be drained
*/
if (wsi->state == LWSS_ESTABLISHED &&
wsi->u.ws.rx_draining_ext) {
lwsl_ext("%s: RX EXT DRAINING: Service\n", __func__);
#ifndef LWS_NO_CLIENT
if (wsi->mode == LWSCM_WS_CLIENT) {
n = lws_client_rx_sm(wsi, 0);
if (n < 0)
/* we closed wsi */
n = 0;
} else
#endif
n = lws_rx_sm(wsi, 0);
goto handled;
}
if (wsi->u.ws.rx_draining_ext)
/*
* We have RX EXT content to drain, but can't do it
* right now. That means we cannot do anything lower
* priority either.
*/
break;
/* 3: RX Flowcontrol buffer needs to be drained
*/
if (wsi->rxflow_buffer) {
lwsl_info("draining rxflow (len %d)\n",
wsi->rxflow_len - wsi->rxflow_pos
);
/* well, drain it */
eff_buf.token = (char *)wsi->rxflow_buffer +
wsi->rxflow_pos;
eff_buf.token_len = wsi->rxflow_len - wsi->rxflow_pos;
draining_flow = 1;
goto drain;
}
/* 4: any incoming (or ah-stashed incoming rx) data ready?
* notice if rx flow going off raced poll(), rx flow wins
*/
if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
break;
read:
/* all the union members start with hdr, so even in ws mode
* we can deal with the ah via u.hdr
*/
if (wsi->u.hdr.ah) {
lwsl_err("%s: %p: using inherited ah rx\n", __func__, wsi);
eff_buf.token_len = wsi->u.hdr.ah->rxlen -
wsi->u.hdr.ah->rxpos;
eff_buf.token = (char *)wsi->u.hdr.ah->rx +
wsi->u.hdr.ah->rxpos;
} else {
eff_buf.token_len = lws_ssl_capable_read(wsi, pt->serv_buf,
pending ? pending : LWS_MAX_SOCKET_IO_BUF);
switch (eff_buf.token_len) {
case 0:
lwsl_info("service_fd: closing due to 0 length read\n");
goto close_and_handled;
case LWS_SSL_CAPABLE_MORE_SERVICE:
lwsl_info("SSL Capable more service\n");
n = 0;
goto handled;
case LWS_SSL_CAPABLE_ERROR:
lwsl_info("Closing when error\n");
goto close_and_handled;
}
eff_buf.token = (char *)pt->serv_buf;
}
/*
* give any active extensions a chance to munge the buffer
* before parse. We pass in a pointer to an lws_tokens struct
* prepared with the default buffer and content length that's in
* there. Rather than rewrite the default buffer, extensions
* that expect to grow the buffer can adapt .token to
* point to their own per-connection buffer in the extension
* user allocation. By default with no extensions or no
* extension callback handling, just the normal input buffer is
* used then so it is efficient.
*/
drain:
do {
more = 0;
m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_RX_PREPARSE,
&eff_buf, 0);
if (m < 0)
goto close_and_handled;
if (m)
more = 1;
/* service incoming data */
if (eff_buf.token_len) {
/*
* if draining from rxflow buffer, not
* critical to track what was used since at the
* use it bumps wsi->rxflow_pos. If we come
* around again it will pick up from where it
* left off.
*/
n = lws_read(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
/* we closed wsi */
n = 0;
goto handled;
}
}
eff_buf.token = NULL;
eff_buf.token_len = 0;
} while (more);
if (wsi->u.hdr.ah) {
lwsl_err("%s: %p: detaching inherited used ah\n", __func__, wsi);
/* show we used all the pending rx up */
wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
/* we can run the normal ah detach flow despite
* being in ws union mode, since all union members
* start with hdr */
lws_header_table_detach(wsi);
}
pending = lws_ssl_pending(wsi);
if (pending) {
handle_pending:
pending = pending > LWS_MAX_SOCKET_IO_BUF ?
LWS_MAX_SOCKET_IO_BUF : pending;
goto read;
}
if (draining_flow && wsi->rxflow_buffer &&
wsi->rxflow_pos == wsi->rxflow_len) {
lwsl_info("flow buffer: drained\n");
lws_free_set_NULL(wsi->rxflow_buffer);
/* having drained the rxflow buffer, can rearm POLLIN */
#ifdef LWS_NO_SERVER
n =
#endif
_lws_rx_flow_control(wsi);
/* n ignored, needed for NO_SERVER case */
}
break;
default:
#ifdef LWS_NO_CLIENT
break;
#else
n = lws_client_socket_service(context, wsi, pollfd);
if (n)
return 1;
goto handled;
#endif
}
n = 0;
goto handled;
close_and_handled:
lwsl_debug("Close and handled\n");
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
/*
* pollfd may point to something else after the close
* due to pollfd swapping scheme on delete on some platforms
* we can't clear revents now because it'd be the wrong guy's revents
*/
return 1;
handled:
pollfd->revents = 0;
return n;
}
LWS_VISIBLE int
lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd)
{
return lws_service_fd_tsi(context, pollfd, 0);
}
/**
* lws_service() - Service any pending websocket activity
* @context: Websocket context
* @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed
* service otherwise block and service immediately, returning
* after the timeout if nothing needed service.
*
* This function deals with any pending websocket traffic, for three
* kinds of event. It handles these events on both server and client
* types of connection the same.
*
* 1) Accept new connections to our context's server
*
* 2) Call the receive callback for incoming frame data received by
* server or client connections.
*
* You need to call this service function periodically to all the above
* functions to happen; if your application is single-threaded you can
* just call it in your main event loop.
*
* Alternatively you can fork a new process that asynchronously handles
* calling this service in a loop. In that case you are happy if this
* call blocks your thread until it needs to take care of something and
* would call it with a large nonzero timeout. Your loop then takes no
* CPU while there is nothing happening.
*
* If you are calling it in a single-threaded app, you don't want it to
* wait around blocking other things in your loop from happening, so you
* would call it with a timeout_ms of 0, so it returns immediately if
* nothing is pending, or as soon as it services whatever was pending.
*/
LWS_VISIBLE int
lws_service(struct lws_context *context, int timeout_ms)
{
return lws_plat_service(context, timeout_ms);
}
LWS_VISIBLE int
lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
{
return lws_plat_service_tsi(context, timeout_ms, tsi);
}