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virtualx-engine/thirdparty/libwebsockets/core/service.c
Fabio Alessandrelli e56a3c1dc4 Bump libwebsockets to version 3.0.0
2018-06-07 18:07:35 +02:00

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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2018 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 "core/private.h"
int
lws_callback_as_writeable(struct lws *wsi)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
int n, m;
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_WRITEABLE_CB, 1);
#if defined(LWS_WITH_STATS)
if (wsi->active_writable_req_us) {
uint64_t ul = time_in_microseconds() -
wsi->active_writable_req_us;
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_MS_WRITABLE_DELAY, ul);
lws_stats_atomic_max(wsi->context, pt,
LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
wsi->active_writable_req_us = 0;
}
#endif
n = wsi->role_ops->writeable_cb[lwsi_role_server(wsi)];
m = user_callback_handle_rxflow(wsi->protocol->callback,
wsi, (enum lws_callback_reasons) n,
wsi->user_space, NULL, 0);
return m;
}
LWS_VISIBLE int
lws_handle_POLLOUT_event(struct lws *wsi, struct lws_pollfd *pollfd)
{
volatile struct lws *vwsi = (volatile struct lws *)wsi;
int n;
//lwsl_notice("%s: %p\n", __func__, wsi);
vwsi->leave_pollout_active = 0;
vwsi->handling_pollout = 1;
/*
* if another thread wants POLLOUT on us, from here on while
* handling_pollout is set, he will only set leave_pollout_active.
* If we are going to disable POLLOUT, we will check that first.
*/
wsi->could_have_pending = 0; /* clear back-to-back write detection */
/*
* 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) {
//lwsl_notice("%s: completing partial\n", __func__);
if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
wsi->trunc_len) < 0) {
lwsl_info("%s signalling to close\n", __func__);
goto bail_die;
}
/* leave POLLOUT active either way */
goto bail_ok;
} else
if (lwsi_state(wsi) == LRS_FLUSHING_BEFORE_CLOSE) {
wsi->socket_is_permanently_unusable = 1;
goto bail_die; /* retry closing now */
}
#ifdef LWS_WITH_CGI
/*
* A cgi master's wire protocol remains h1 or h2. He is just getting
* his data from his child cgis.
*/
if (wsi->http.cgi) {
/* also one shot */
if (pollfd)
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
goto user_service_go_again;
}
#endif
/* if we got here, we should have wire protocol ops set on the wsi */
assert(wsi->role_ops);
if (!wsi->role_ops->handle_POLLOUT)
goto bail_ok;
switch ((wsi->role_ops->handle_POLLOUT)(wsi)) {
case LWS_HP_RET_BAIL_OK:
goto bail_ok;
case LWS_HP_RET_BAIL_DIE:
goto bail_die;
case LWS_HP_RET_USER_SERVICE:
break;
default:
assert(0);
}
/* one shot */
if (wsi->parent_carries_io) {
vwsi->handling_pollout = 0;
vwsi->leave_pollout_active = 0;
return lws_callback_as_writeable(wsi);
}
if (pollfd) {
int eff = vwsi->leave_pollout_active;
if (!eff) {
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
goto bail_die;
}
}
vwsi->handling_pollout = 0;
/* cannot get leave_pollout_active set after the above */
if (!eff && wsi->leave_pollout_active) {
/*
* got set inbetween sampling eff and clearing
* handling_pollout, force POLLOUT on
*/
lwsl_debug("leave_pollout_active\n");
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT)) {
lwsl_info("failed at set pollfd\n");
goto bail_die;
}
}
vwsi->leave_pollout_active = 0;
}
if (lwsi_role_client(wsi) &&
!wsi->hdr_parsing_completed &&
lwsi_state(wsi) != LRS_H2_WAITING_TO_SEND_HEADERS &&
lwsi_state(wsi) != LRS_ISSUE_HTTP_BODY
)
goto bail_ok;
#ifdef LWS_WITH_CGI
user_service_go_again:
#endif
if (wsi->role_ops->perform_user_POLLOUT) {
if (wsi->role_ops->perform_user_POLLOUT(wsi) == -1)
goto bail_die;
else
goto bail_ok;
}
lwsl_debug("%s: %p: non mux: wsistate 0x%x, ops %s\n", __func__, wsi,
wsi->wsistate, wsi->role_ops->name);
vwsi = (volatile struct lws *)wsi;
vwsi->leave_pollout_active = 0;
n = lws_callback_as_writeable(wsi);
vwsi->handling_pollout = 0;
if (vwsi->leave_pollout_active)
lws_change_pollfd(wsi, 0, LWS_POLLOUT);
return n;
/*
* since these don't disable the POLLOUT, they are always doing the
* right thing for leave_pollout_active whether it was set or not.
*/
bail_ok:
vwsi->handling_pollout = 0;
vwsi->leave_pollout_active = 0;
return 0;
bail_die:
vwsi->handling_pollout = 0;
vwsi->leave_pollout_active = 0;
return -1;
}
static int
__lws_service_timeout_check(struct lws *wsi, time_t sec)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
int n = 0;
(void)n;
/*
* if we went beyond the allowed time, kill the
* connection
*/
if (wsi->dll_timeout.prev &&
lws_compare_time_t(wsi->context, sec, wsi->pending_timeout_set) >
wsi->pending_timeout_limit) {
if (wsi->desc.sockfd != LWS_SOCK_INVALID &&
wsi->position_in_fds_table >= 0)
n = pt->fds[wsi->position_in_fds_table].events;
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_TIMEOUTS, 1);
/* no need to log normal idle keepalive timeout */
if (wsi->pending_timeout != PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE)
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
lwsl_info("wsi %p: TIMEDOUT WAITING on %d "
"(did hdr %d, ah %p, wl %d, pfd "
"events %d) %llu vs %llu\n",
(void *)wsi, wsi->pending_timeout,
wsi->hdr_parsing_completed, wsi->http.ah,
pt->http.ah_wait_list_length, n,
(unsigned long long)sec,
(unsigned long long)wsi->pending_timeout_limit);
#if defined(LWS_WITH_CGI)
if (wsi->http.cgi)
lwsl_notice("CGI timeout: %s\n", wsi->http.cgi->summary);
#endif
#else
lwsl_info("wsi %p: TIMEDOUT WAITING on %d ", (void *)wsi,
wsi->pending_timeout);
#endif
/*
* 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;
if (lwsi_state(wsi) == LRS_WAITING_SSL && wsi->protocol)
wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space,
(void *)"Timed out waiting SSL", 21);
__lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "timeout");
return 1;
}
return 0;
}
int lws_rxflow_cache(struct lws *wsi, unsigned char *buf, int n, int len)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
uint8_t *buffered;
size_t blen;
int ret = 0, m;
/* his RX is flowcontrolled, don't send remaining now */
blen = lws_buflist_next_segment_len(&wsi->buflist, &buffered);
if (blen) {
if (buf >= buffered && buf + len <= buffered + blen) {
/* rxflow while we were spilling prev rxflow */
lwsl_info("%s: staying in rxflow buf\n", __func__);
return 1;
}
ret = 1;
}
/* a new rxflow, buffer it and warn caller */
m = lws_buflist_append_segment(&wsi->buflist, buf + n, len - n);
if (m < 0)
return -1;
if (m) {
lwsl_debug("%s: added %p to rxflow list\n", __func__, wsi);
lws_dll_lws_add_front(&wsi->dll_buflist, &pt->dll_head_buflist);
}
return ret;
}
/* 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
*/
LWS_VISIBLE LWS_EXTERN int
lws_service_adjust_timeout(struct lws_context *context, int timeout_ms, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
/* 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
*/
#if defined(LWS_ROLE_WS) && !defined(LWS_WITHOUT_EXTENSIONS)
/* 1) if we know we are draining rx ext, do not wait in poll */
if (pt->ws.rx_draining_ext_list)
return 0;
#endif
/* 2) if we know we have non-network pending data, do not wait in poll */
if (pt->context->tls_ops &&
pt->context->tls_ops->fake_POLLIN_for_buffered)
if (pt->context->tls_ops->fake_POLLIN_for_buffered(pt))
return 0;
/* 3) If there is any wsi with rxflow buffered and in a state to process
* it, we should not wait in poll
*/
lws_start_foreach_dll(struct lws_dll_lws *, d, pt->dll_head_buflist.next) {
struct lws *wsi = lws_container_of(d, struct lws, dll_buflist);
if (lwsi_state(wsi) != LRS_DEFERRING_ACTION)
return 0;
} lws_end_foreach_dll(d);
return timeout_ms;
}
/*
* POLLIN said there is something... we must read it, and either use it; or
* if other material already in the buflist append it and return the buflist
* head material.
*/
int
lws_buflist_aware_read(struct lws_context_per_thread *pt, struct lws *wsi,
struct lws_tokens *ebuf)
{
int n, prior = (int)lws_buflist_next_segment_len(&wsi->buflist, NULL);
ebuf->token = (char *)pt->serv_buf;
ebuf->len = lws_ssl_capable_read(wsi, pt->serv_buf,
wsi->context->pt_serv_buf_size);
if (ebuf->len == LWS_SSL_CAPABLE_MORE_SERVICE && prior)
goto get_from_buflist;
if (ebuf->len <= 0)
return 0;
/* nothing in buflist already? Then just use what we read */
if (!prior)
return 0;
/* stash what we read */
n = lws_buflist_append_segment(&wsi->buflist, (uint8_t *)ebuf->token,
ebuf->len);
if (n < 0)
return -1;
if (n) {
lwsl_debug("%s: added %p to rxflow list\n", __func__, wsi);
lws_dll_lws_add_front(&wsi->dll_buflist, &pt->dll_head_buflist);
}
/* get the first buflist guy in line */
get_from_buflist:
ebuf->len = (int)lws_buflist_next_segment_len(&wsi->buflist,
(uint8_t **)&ebuf->token);
return 1; /* came from buflist */
}
int
lws_buflist_aware_consume(struct lws *wsi, struct lws_tokens *ebuf, int used,
int buffered)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
int m;
/* it's in the buflist; we didn't use any */
if (!used && buffered)
return 0;
if (used && buffered) {
m = lws_buflist_use_segment(&wsi->buflist, used);
lwsl_info("%s: draining rxflow: used %d, next %d\n",
__func__, used, m);
if (m)
return 0;
lwsl_info("%s: removed %p from dll_buflist\n", __func__, wsi);
lws_dll_lws_remove(&wsi->dll_buflist);
return 0;
}
/* any remainder goes on the buflist */
if (used != ebuf->len) {
m = lws_buflist_append_segment(&wsi->buflist,
(uint8_t *)ebuf->token + used,
ebuf->len - used);
if (m < 0)
return 1; /* OOM */
if (m) {
lwsl_debug("%s: added %p to rxflow list\n", __func__, wsi);
lws_dll_lws_add_front(&wsi->dll_buflist, &pt->dll_head_buflist);
}
}
return 0;
}
void
lws_service_do_ripe_rxflow(struct lws_context_per_thread *pt)
{
struct lws_pollfd pfd;
if (!pt->dll_head_buflist.next)
return;
/*
* service all guys with pending rxflow that reached a state they can
* accept the pending data
*/
lws_pt_lock(pt, __func__);
lws_start_foreach_dll_safe(struct lws_dll_lws *, d, d1,
pt->dll_head_buflist.next) {
struct lws *wsi = lws_container_of(d, struct lws, dll_buflist);
pfd.events = LWS_POLLIN;
pfd.revents = LWS_POLLIN;
pfd.fd = -1;
lwsl_debug("%s: rxflow processing: %p 0x%x\n", __func__, wsi,
wsi->wsistate);
if (!lws_is_flowcontrolled(wsi) &&
lwsi_state(wsi) != LRS_DEFERRING_ACTION &&
(wsi->role_ops->handle_POLLIN)(pt, wsi, &pfd) ==
LWS_HPI_RET_PLEASE_CLOSE_ME)
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
"close_and_handled");
} lws_end_foreach_dll_safe(d, d1);
lws_pt_unlock(pt);
}
/*
* 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];
#if defined(LWS_WITH_TLS)
struct lws *wsi, *wsi_next;
#endif
int forced = 0;
lws_pt_lock(pt, __func__);
/*
* 1) If there is any wsi with a buflist and in a state to process
* it, we should not wait in poll
*/
lws_start_foreach_dll(struct lws_dll_lws *, d, pt->dll_head_buflist.next) {
struct lws *wsi = lws_container_of(d, struct lws, dll_buflist);
if (lwsi_state(wsi) != LRS_DEFERRING_ACTION) {
forced = 1;
break;
}
} lws_end_foreach_dll(d);
#if defined(LWS_ROLE_WS)
forced |= role_ops_ws.service_flag_pending(context, tsi);
#endif
#if defined(LWS_WITH_TLS)
/*
* 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->tls.pending_read_list;
while (wsi) {
wsi_next = wsi->tls.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
lws_pt_unlock(pt);
return forced;
}
static int
lws_service_periodic_checks(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 *wsi;
int timed_out = 0;
time_t now;
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
struct allocated_headers *ah;
int m;
#endif
if (!context->protocol_init_done)
if (lws_protocol_init(context))
return -1;
time(&now);
/*
* handle case that system time was uninitialized when lws started
* at boot, and got initialized a little later
*/
if (context->time_up < 1464083026 && now > 1464083026)
context->time_up = now;
if (context->last_timeout_check_s &&
now - context->last_timeout_check_s > 100) {
/*
* There has been a discontiguity. Any stored time that is
* less than context->time_discontiguity should have context->
* time_fixup added to it.
*
* Some platforms with no RTC will experience this as a normal
* event when ntp sets their clock, but we can have started
* long before that with a 0-based unix time.
*/
context->time_discontiguity = now;
context->time_fixup = now - context->last_timeout_check_s;
lwsl_notice("time discontiguity: at old time %llus, "
"new time %llus: +%llus\n",
(unsigned long long)context->last_timeout_check_s,
(unsigned long long)context->time_discontiguity,
(unsigned long long)context->time_fixup);
context->last_timeout_check_s = now - 1;
}
if (!lws_compare_time_t(context, context->last_timeout_check_s, now))
return 0;
context->last_timeout_check_s = now;
#if defined(LWS_WITH_STATS)
if (!tsi && now - context->last_dump > 10) {
lws_stats_log_dump(context);
context->last_dump = now;
}
#endif
lws_plat_service_periodic(context);
lws_check_deferred_free(context, 0);
#if defined(LWS_WITH_PEER_LIMITS)
lws_peer_cull_peer_wait_list(context);
#endif
/* retire unused deprecated context */
#if !defined(LWS_PLAT_OPTEE) && !defined(LWS_WITH_ESP32)
#if !defined(_WIN32)
if (context->deprecated && !context->count_wsi_allocated) {
lwsl_notice("%s: ending deprecated context\n", __func__);
kill(getpid(), SIGINT);
return 0;
}
#endif
#endif
/* global timeout check once per second */
if (pollfd)
our_fd = pollfd->fd;
/*
* Phase 1: check every wsi on the timeout check list
*/
lws_pt_lock(pt, __func__);
lws_start_foreach_dll_safe(struct lws_dll_lws *, d, d1,
context->pt[tsi].dll_head_timeout.next) {
wsi = lws_container_of(d, struct lws, dll_timeout);
tmp_fd = wsi->desc.sockfd;
if (__lws_service_timeout_check(wsi, 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 */
}
} lws_end_foreach_dll_safe(d, d1);
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
/*
* Phase 2: double-check active ah timeouts independent of wsi
* timeout status
*/
ah = pt->http.ah_list;
while (ah) {
int len;
char buf[256];
const unsigned char *c;
if (!ah->in_use || !ah->wsi || !ah->assigned ||
(ah->wsi->vhost &&
lws_compare_time_t(context, now, ah->assigned) <
ah->wsi->vhost->timeout_secs_ah_idle + 360)) {
ah = ah->next;
continue;
}
/*
* a single ah session somehow got held for
* an unreasonable amount of time.
*
* Dump info on the connection...
*/
wsi = ah->wsi;
buf[0] = '\0';
#if !defined(LWS_PLAT_OPTEE)
lws_get_peer_simple(wsi, buf, sizeof(buf));
#else
buf[0] = '\0';
#endif
lwsl_notice("ah excessive hold: wsi %p\n"
" peer address: %s\n"
" ah pos %u\n",
wsi, buf, ah->pos);
buf[0] = '\0';
m = 0;
do {
c = lws_token_to_string(m);
if (!c)
break;
if (!(*c))
break;
len = lws_hdr_total_length(wsi, m);
if (!len || len > (int)sizeof(buf) - 1) {
m++;
continue;
}
if (lws_hdr_copy(wsi, buf,
sizeof buf, m) > 0) {
buf[sizeof(buf) - 1] = '\0';
lwsl_notice(" %s = %s\n",
(const char *)c, buf);
}
m++;
} while (1);
/* explicitly detach the ah */
lws_header_table_detach(wsi, 0);
/* ... and then drop the connection */
m = 0;
if (wsi->desc.sockfd == our_fd) {
m = timed_out;
/* it was the guy we came to service! */
timed_out = 1;
}
if (!m) /* if he didn't already timeout */
__lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
"excessive ah");
ah = pt->http.ah_list;
}
#endif
lws_pt_unlock(pt);
#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
/*
* Phase 3: vhost / protocol timer callbacks
*/
wsi = NULL;
lws_start_foreach_ll(struct lws_vhost *, v, context->vhost_list) {
struct lws_timed_vh_protocol *nx;
if (v->timed_vh_protocol_list) {
lws_start_foreach_ll(struct lws_timed_vh_protocol *,
q, v->timed_vh_protocol_list) {
if (now >= q->time) {
if (!wsi)
wsi = lws_zalloc(sizeof(*wsi), "cbwsi");
wsi->context = context;
wsi->vhost = v;
wsi->protocol = q->protocol;
lwsl_debug("timed cb: vh %s, protocol %s, reason %d\n", v->name, q->protocol->name, q->reason);
q->protocol->callback(wsi, q->reason, NULL, NULL, 0);
nx = q->next;
lws_timed_callback_remove(v, q);
q = nx;
continue; /* we pointed ourselves to the next from the now-deleted guy */
}
} lws_end_foreach_ll(q, next);
}
} lws_end_foreach_ll(v, vhost_next);
if (wsi)
lws_free(wsi);
/*
* Phase 4: check for unconfigured vhosts due to required
* interface missing before
*/
lws_context_lock(context);
lws_start_foreach_llp(struct lws_vhost **, pv,
context->no_listener_vhost_list) {
struct lws_vhost *v = *pv;
lwsl_debug("deferred iface: checking if on vh %s\n", (*pv)->name);
if (_lws_vhost_init_server(NULL, *pv) == 0) {
/* became happy */
lwsl_notice("vh %s: became connected\n", v->name);
*pv = v->no_listener_vhost_list;
v->no_listener_vhost_list = NULL;
break;
}
} lws_end_foreach_llp(pv, no_listener_vhost_list);
lws_context_unlock(context);
/*
* Phase 5: role periodic checks
*/
#if defined(LWS_ROLE_WS)
role_ops_ws.periodic_checks(context, tsi, now);
#endif
#if defined(LWS_ROLE_CGI)
role_ops_cgi.periodic_checks(context, tsi, now);
#endif
/*
* Phase 6: check the remaining cert lifetime daily
*/
if (context->tls_ops &&
context->tls_ops->periodic_housekeeping)
context->tls_ops->periodic_housekeeping(context, now);
return timed_out;
}
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];
struct lws *wsi;
if (!context || context->being_destroyed1)
return -1;
/* the socket we came to service timed out, nothing to do */
if (lws_service_periodic_checks(context, pollfd, tsi) || !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
*/
/* 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
if ((!(pollfd->revents & pollfd->events & LWS_POLLIN)) &&
(pollfd->revents & LWS_POLLHUP)) {
lwsl_debug("pollhup\n");
wsi->socket_is_permanently_unusable = 1;
goto close_and_handled;
}
#if defined(LWS_WITH_TLS)
if (lwsi_state(wsi) == LRS_SHUTDOWN &&
lws_is_ssl(wsi) && wsi->tls.ssl) {
switch (__lws_tls_shutdown(wsi)) {
case LWS_SSL_CAPABLE_DONE:
case LWS_SSL_CAPABLE_ERROR:
goto close_and_handled;
case LWS_SSL_CAPABLE_MORE_SERVICE_READ:
case LWS_SSL_CAPABLE_MORE_SERVICE_WRITE:
case LWS_SSL_CAPABLE_MORE_SERVICE:
goto handled;
}
}
#endif
wsi->could_have_pending = 0; /* clear back-to-back write detection */
/* okay, what we came here to do... */
/* if we got here, we should have wire protocol ops set on the wsi */
assert(wsi->role_ops);
// lwsl_notice("%s: %s: wsistate 0x%x\n", __func__, wsi->role_ops->name,
// wsi->wsistate);
switch ((wsi->role_ops->handle_POLLIN)(pt, wsi, pollfd)) {
case LWS_HPI_RET_WSI_ALREADY_DIED:
return 1;
case LWS_HPI_RET_HANDLED:
break;
case LWS_HPI_RET_PLEASE_CLOSE_ME:
close_and_handled:
lwsl_debug("%p: Close and handled\n", wsi);
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
"close_and_handled");
#if defined(_DEBUG) && defined(LWS_WITH_LIBUV)
/*
* confirm close has no problem being called again while
* it waits for libuv service to complete the first async
* close
*/
if (context->event_loop_ops == &event_loop_ops_uv)
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
"close_and_handled uv repeat test");
#endif
/*
* 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;
default:
assert(0);
}
#if defined(LWS_WITH_TLS)
handled:
#endif
pollfd->revents = 0;
lws_pt_lock(pt, __func__);
__lws_hrtimer_service(pt);
lws_pt_unlock(pt);
return 0;
}
LWS_VISIBLE int
lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd)
{
return lws_service_fd_tsi(context, pollfd, 0);
}
LWS_VISIBLE int
lws_service(struct lws_context *context, int timeout_ms)
{
struct lws_context_per_thread *pt = &context->pt[0];
int n;
if (!context)
return 1;
pt->inside_service = 1;
if (context->event_loop_ops->run_pt) {
/* we are configured for an event loop */
context->event_loop_ops->run_pt(context, 0);
pt->inside_service = 0;
return 1;
}
n = lws_plat_service(context, timeout_ms);
pt->inside_service = 0;
return n;
}
LWS_VISIBLE int
lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
int n;
pt->inside_service = 1;
if (context->event_loop_ops->run_pt) {
/* we are configured for an event loop */
context->event_loop_ops->run_pt(context, tsi);
pt->inside_service = 0;
return 1;
}
n = _lws_plat_service_tsi(context, timeout_ms, tsi);
pt->inside_service = 0;
return n;
}
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