314 lines
12 KiB
C
314 lines
12 KiB
C
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/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/*! \defgroup timeout Connection timeouts
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APIs related to setting connection timeouts
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*/
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//@{
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#if defined(STANDALONE)
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struct lws_context_standalone;
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#define lws_context lws_context_standalone
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#endif
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/*
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* NOTE: These public enums are part of the abi. If you want to add one,
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* add it at where specified so existing users are unaffected.
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*/
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enum pending_timeout {
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NO_PENDING_TIMEOUT = 0,
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PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE = 1,
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PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE = 2,
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PENDING_TIMEOUT_ESTABLISH_WITH_SERVER = 3,
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PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE = 4,
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PENDING_TIMEOUT_AWAITING_PING = 5,
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PENDING_TIMEOUT_CLOSE_ACK = 6,
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PENDING_TIMEOUT_UNUSED1 = 7,
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PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE = 8,
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PENDING_TIMEOUT_SSL_ACCEPT = 9,
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PENDING_TIMEOUT_HTTP_CONTENT = 10,
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PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND = 11,
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PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE = 12,
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PENDING_TIMEOUT_SHUTDOWN_FLUSH = 13,
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PENDING_TIMEOUT_CGI = 14,
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PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE = 15,
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PENDING_TIMEOUT_WS_PONG_CHECK_SEND_PING = 16,
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PENDING_TIMEOUT_WS_PONG_CHECK_GET_PONG = 17,
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PENDING_TIMEOUT_CLIENT_ISSUE_PAYLOAD = 18,
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PENDING_TIMEOUT_AWAITING_SOCKS_GREETING_REPLY = 19,
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PENDING_TIMEOUT_AWAITING_SOCKS_CONNECT_REPLY = 20,
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PENDING_TIMEOUT_AWAITING_SOCKS_AUTH_REPLY = 21,
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PENDING_TIMEOUT_KILLED_BY_SSL_INFO = 22,
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PENDING_TIMEOUT_KILLED_BY_PARENT = 23,
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PENDING_TIMEOUT_CLOSE_SEND = 24,
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PENDING_TIMEOUT_HOLDING_AH = 25,
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PENDING_TIMEOUT_UDP_IDLE = 26,
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PENDING_TIMEOUT_CLIENT_CONN_IDLE = 27,
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PENDING_TIMEOUT_LAGGING = 28,
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PENDING_TIMEOUT_THREADPOOL = 29,
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PENDING_TIMEOUT_THREADPOOL_TASK = 30,
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PENDING_TIMEOUT_KILLED_BY_PROXY_CLIENT_CLOSE = 31,
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PENDING_TIMEOUT_USER_OK = 32,
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/****** add new things just above ---^ ******/
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PENDING_TIMEOUT_USER_REASON_BASE = 1000
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};
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#define lws_time_in_microseconds lws_now_usecs
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#define LWS_TO_KILL_ASYNC -1
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/**< If LWS_TO_KILL_ASYNC is given as the timeout sec in a lws_set_timeout()
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* call, then the connection is marked to be killed at the next timeout
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* check. This is how you should force-close the wsi being serviced if
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* you are doing it outside the callback (where you should close by nonzero
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* return).
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*/
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#define LWS_TO_KILL_SYNC -2
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/**< If LWS_TO_KILL_SYNC is given as the timeout sec in a lws_set_timeout()
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* call, then the connection is closed before returning (which may delete
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* the wsi). This should only be used where the wsi being closed is not the
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* wsi currently being serviced.
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*/
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/**
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* lws_set_timeout() - marks the wsi as subject to a timeout some seconds hence
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*
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* \param wsi: Websocket connection instance
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* \param reason: timeout reason
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* \param secs: how many seconds. You may set to LWS_TO_KILL_ASYNC to
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* force the connection to timeout at the next opportunity, or
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* LWS_TO_KILL_SYNC to close it synchronously if you know the
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* wsi is not the one currently being serviced.
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_set_timeout(struct lws *wsi, enum pending_timeout reason, int secs);
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/**
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* lws_set_timeout_us() - marks the wsi as subject to a timeout some us hence
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*
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* \param wsi: Websocket connection instance
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* \param reason: timeout reason
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* \param us: 0 removes the timeout, otherwise number of us to wait
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*
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* Higher-resolution version of lws_set_timeout(). Actual resolution depends
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* on platform and load, usually ms.
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*/
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void
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lws_set_timeout_us(struct lws *wsi, enum pending_timeout reason, lws_usec_t us);
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/* helper for clearer LWS_TO_KILL_ASYNC / LWS_TO_KILL_SYNC usage */
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#define lws_wsi_close(w, to_kill) lws_set_timeout(w, 1, to_kill)
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#define LWS_SET_TIMER_USEC_CANCEL ((lws_usec_t)-1ll)
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#define LWS_USEC_PER_SEC ((lws_usec_t)1000000)
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/**
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* lws_set_timer_usecs() - schedules a callback on the wsi in the future
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*
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* \param wsi: Websocket connection instance
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* \param usecs: LWS_SET_TIMER_USEC_CANCEL removes any existing scheduled
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* callback, otherwise number of microseconds in the future
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* the callback will occur at.
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*
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* NOTE: event loop support for this:
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*
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* default poll() loop: yes
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* libuv event loop: yes
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* libev: not implemented (patch welcome)
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* libevent: not implemented (patch welcome)
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*
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* After the deadline expires, the wsi will get a callback of type
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* LWS_CALLBACK_TIMER and the timer is exhausted. The deadline may be
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* continuously deferred by further calls to lws_set_timer_usecs() with a later
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* deadline, or cancelled by lws_set_timer_usecs(wsi, -1).
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*
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* If the timer should repeat, lws_set_timer_usecs() must be called again from
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* LWS_CALLBACK_TIMER.
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*
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* Accuracy depends on the platform and the load on the event loop or system...
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* all that's guaranteed is the callback will come after the requested wait
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* period.
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_set_timer_usecs(struct lws *wsi, lws_usec_t usecs);
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struct lws_sorted_usec_list;
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typedef void (*sul_cb_t)(struct lws_sorted_usec_list *sul);
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typedef struct lws_sorted_usec_list {
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struct lws_dll2 list; /* simplify the code by keeping this at start */
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lws_usec_t us;
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sul_cb_t cb;
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uint32_t latency_us; /* us it may safely be delayed */
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} lws_sorted_usec_list_t;
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/*
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* There are multiple sul owners to allow accounting for, a) events that must
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* wake from suspend, and b) events that can be missued due to suspend
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*/
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#define LWS_COUNT_PT_SUL_OWNERS 2
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#define LWSSULLI_MISS_IF_SUSPENDED 0
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#define LWSSULLI_WAKE_IF_SUSPENDED 1
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/*
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* lws_sul2_schedule() - schedule a callback
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*
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* \param context: the lws_context
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* \param tsi: the thread service index (usually 0)
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* \param flags: LWSSULLI_...
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* \param sul: pointer to the sul element
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*
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* Generic callback-at-a-later time function. The callback happens on the
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* event loop thread context.
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*
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* Although the api has us resultion, the actual resolution depends on the
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* platform and may be, eg, 1ms.
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*
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* This doesn't allocate and doesn't fail.
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*
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* If flags contains LWSSULLI_WAKE_IF_SUSPENDED, the scheduled event is placed
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* on a sul owner list that, if the system has entered low power suspend mode,
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* tries to arrange that the system should wake from platform suspend just
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* before the event is due. Scheduled events without this flag will be missed
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* in the case the system is in suspend and nothing else happens to have woken
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* it.
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*
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* You can call it again with another us value to change the delay or move the
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* event to a different owner (ie, wake or miss on suspend).
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_sul2_schedule(struct lws_context *context, int tsi, int flags,
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lws_sorted_usec_list_t *sul);
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/*
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* lws_sul_cancel() - cancel scheduled callback
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*
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* \param sul: pointer to the sul element
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*
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* If it's scheduled, remove the sul from its owning sorted list.
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* If not scheduled, it's a NOP.
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_sul_cancel(lws_sorted_usec_list_t *sul);
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/*
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* lws_sul_earliest_wakeable_event() - get earliest wake-from-suspend event
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*
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* \param ctx: the lws context
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* \param pearliest: pointer to lws_usec_t to take the result
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*
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* Either returns 1 if no pending event, or 0 and sets *pearliest to the
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* MONOTONIC time of the current earliest next expected event.
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*/
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LWS_VISIBLE LWS_EXTERN int
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lws_sul_earliest_wakeable_event(struct lws_context *ctx, lws_usec_t *pearliest);
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/*
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* For backwards compatibility
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*
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* If us is LWS_SET_TIMER_USEC_CANCEL, the sul is removed from the scheduler.
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* New code can use lws_sul_cancel()
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_sul_schedule(struct lws_context *ctx, int tsi, lws_sorted_usec_list_t *sul,
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sul_cb_t _cb, lws_usec_t _us);
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LWS_VISIBLE LWS_EXTERN void
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lws_sul_schedule_wakesuspend(struct lws_context *ctx, int tsi,
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lws_sorted_usec_list_t *sul, sul_cb_t _cb,
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lws_usec_t _us);
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#if defined(LWS_WITH_SUL_DEBUGGING)
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/**
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* lws_sul_debug_zombies() - assert there are no scheduled sul in a given object
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*
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* \param ctx: lws_context
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* \param po: pointer to the object that is about to be destroyed
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* \param len: length of the object that is about to be destroyed
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* \param destroy_description: string clue what any failure is related to
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*
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* This is an optional debugging helper that walks the sul scheduler lists
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* confirming that there are no suls scheduled that live inside the object
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* footprint described by po and len. When internal objects are about to be
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* destroyed, like wsi / user_data or secure stream handles, if
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* LWS_WITH_SUL_DEBUGGING is enabled the scheduler is checked for anything
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* in the object being destroyed. If something found, an error is printed and
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* an assert fired.
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*
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* Internal sul like timeouts should always be cleaned up correctly, but user
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* suls in, eg, wsi user_data area, or in secure stream user allocation, may be
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* the cause of difficult to find bugs if valgrind not available and the user
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* code left a sul in the scheduler after destroying the object the sul was
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* living in.
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_sul_debug_zombies(struct lws_context *ctx, void *po, size_t len,
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const char *destroy_description);
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#else
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#define lws_sul_debug_zombies(_a, _b, _c, _d)
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#endif
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/*
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* lws_validity_confirmed() - reset the validity timer for a network connection
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*
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* \param wsi: the connection that saw traffic proving the connection valid
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*
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* Network connections are subject to intervals defined by the context, the
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* vhost if server connections, or the client connect info if a client
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* connection. If the connection goes longer than the specified time since
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* last observing traffic that can only happen if traffic is passing in both
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* directions, then lws will try to create a PING transaction on the network
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* connection.
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*
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* If the connection reaches the specified `.secs_since_valid_hangup` time
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* still without any proof of validity, the connection will be closed.
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*
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* If the PONG comes, or user code observes traffic that satisfies the proof
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* that both directions are passing traffic to the peer and calls this api,
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* the connection validity timer is reset and the scheme repeats.
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*/
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LWS_VISIBLE LWS_EXTERN void
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lws_validity_confirmed(struct lws *wsi);
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/*
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* These are not normally needed, they're exported for the case there's code
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* using lws_sul for which lws is an optional link dependency.
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*/
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LWS_VISIBLE LWS_EXTERN int
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__lws_sul_insert(lws_dll2_owner_t *own, lws_sorted_usec_list_t *sul);
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LWS_VISIBLE LWS_EXTERN lws_usec_t
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__lws_sul_service_ripe(lws_dll2_owner_t *own, int own_len, lws_usec_t usnow);
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#if defined(STANDALONE)
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#undef lws_context
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#endif
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///@}
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