init repo.
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189
third_party/curl/lib/multihandle.h
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third_party/curl/lib/multihandle.h
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#ifndef HEADER_CURL_MULTIHANDLE_H
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#define HEADER_CURL_MULTIHANDLE_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "llist.h"
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#include "hash.h"
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#include "conncache.h"
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#include "psl.h"
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#include "socketpair.h"
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struct connectdata;
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struct Curl_message {
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struct Curl_llist_element list;
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/* the 'CURLMsg' is the part that is visible to the external user */
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struct CURLMsg extmsg;
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};
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/* NOTE: if you add a state here, add the name to the statename[] array as
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well!
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*/
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typedef enum {
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MSTATE_INIT, /* 0 - start in this state */
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MSTATE_PENDING, /* 1 - no connections, waiting for one */
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MSTATE_SETUP, /* 2 - start a new transfer */
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MSTATE_CONNECT, /* 3 - resolve/connect has been sent off */
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MSTATE_RESOLVING, /* 4 - awaiting the resolve to finalize */
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MSTATE_CONNECTING, /* 5 - awaiting the TCP connect to finalize */
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MSTATE_TUNNELING, /* 6 - awaiting HTTPS proxy SSL initialization to
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complete and/or proxy CONNECT to finalize */
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MSTATE_PROTOCONNECT, /* 7 - initiate protocol connect procedure */
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MSTATE_PROTOCONNECTING, /* 8 - completing the protocol-specific connect
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phase */
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MSTATE_DO, /* 9 - start send off the request (part 1) */
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MSTATE_DOING, /* 10 - sending off the request (part 1) */
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MSTATE_DOING_MORE, /* 11 - send off the request (part 2) */
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MSTATE_DID, /* 12 - done sending off request */
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MSTATE_PERFORMING, /* 13 - transfer data */
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MSTATE_RATELIMITING, /* 14 - wait because limit-rate exceeded */
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MSTATE_DONE, /* 15 - post data transfer operation */
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MSTATE_COMPLETED, /* 16 - operation complete */
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MSTATE_MSGSENT, /* 17 - the operation complete message is sent */
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MSTATE_LAST /* 18 - not a true state, never use this */
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} CURLMstate;
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/* we support N sockets per easy handle. Set the corresponding bit to what
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action we should wait for */
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#define MAX_SOCKSPEREASYHANDLE 5
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#define GETSOCK_READABLE (0x00ff)
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#define GETSOCK_WRITABLE (0xff00)
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#define CURLPIPE_ANY (CURLPIPE_MULTIPLEX)
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#if !defined(CURL_DISABLE_SOCKETPAIR)
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#define ENABLE_WAKEUP
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#endif
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/* value for MAXIMUM CONCURRENT STREAMS upper limit */
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#define INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
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/* Curl_multi SSL backend-specific data; declared differently by each SSL
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backend */
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struct multi_ssl_backend_data;
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/* This is the struct known as CURLM on the outside */
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struct Curl_multi {
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/* First a simple identifier to easier detect if a user mix up
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this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
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unsigned int magic;
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/* We have a doubly-linked list with easy handles */
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struct Curl_easy *easyp;
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struct Curl_easy *easylp; /* last node */
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unsigned int num_easy; /* amount of entries in the linked list above. */
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unsigned int num_alive; /* amount of easy handles that are added but have
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not yet reached COMPLETE state */
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struct Curl_llist msglist; /* a list of messages from completed transfers */
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struct Curl_llist pending; /* Curl_easys that are in the
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MSTATE_PENDING state */
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struct Curl_llist msgsent; /* Curl_easys that are in the
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MSTATE_MSGSENT state */
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/* callback function and user data pointer for the *socket() API */
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curl_socket_callback socket_cb;
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void *socket_userp;
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/* callback function and user data pointer for server push */
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curl_push_callback push_cb;
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void *push_userp;
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/* Hostname cache */
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struct Curl_hash hostcache;
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#ifdef USE_LIBPSL
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/* PSL cache. */
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struct PslCache psl;
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#endif
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/* timetree points to the splay-tree of time nodes to figure out expire
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times of all currently set timers */
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struct Curl_tree *timetree;
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/* buffer used for transfer data, lazy initialized */
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char *xfer_buf; /* the actual buffer */
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size_t xfer_buf_len; /* the allocated length */
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/* buffer used for upload data, lazy initialized */
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char *xfer_ulbuf; /* the actual buffer */
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size_t xfer_ulbuf_len; /* the allocated length */
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#if defined(USE_SSL)
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struct multi_ssl_backend_data *ssl_backend_data;
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#endif
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/* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
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the pluralis form, there can be more than one easy handle waiting on the
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same actual socket) */
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struct Curl_hash sockhash;
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/* Shared connection cache (bundles)*/
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struct conncache conn_cache;
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long max_host_connections; /* if >0, a fixed limit of the maximum number
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of connections per host */
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long max_total_connections; /* if >0, a fixed limit of the maximum number
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of connections in total */
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/* timer callback and user data pointer for the *socket() API */
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curl_multi_timer_callback timer_cb;
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void *timer_userp;
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struct curltime timer_lastcall; /* the fixed time for the timeout for the
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previous callback */
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#ifdef USE_WINSOCK
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WSAEVENT wsa_event; /* winsock event used for waits */
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#else
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#ifdef ENABLE_WAKEUP
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curl_socket_t wakeup_pair[2]; /* pipe()/socketpair() used for wakeup
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0 is used for read, 1 is used for write */
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#endif
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#endif
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unsigned int max_concurrent_streams;
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unsigned int maxconnects; /* if >0, a fixed limit of the maximum number of
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entries we're allowed to grow the connection
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cache to */
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#define IPV6_UNKNOWN 0
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#define IPV6_DEAD 1
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#define IPV6_WORKS 2
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unsigned char ipv6_up; /* IPV6_* defined */
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BIT(multiplexing); /* multiplexing wanted */
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BIT(recheckstate); /* see Curl_multi_connchanged */
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BIT(in_callback); /* true while executing a callback */
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#ifdef USE_OPENSSL
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BIT(ssl_seeded);
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#endif
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BIT(dead); /* a callback returned error, everything needs to crash and
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burn */
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BIT(xfer_buf_borrowed); /* xfer_buf is currently being borrowed */
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BIT(xfer_ulbuf_borrowed); /* xfer_ulbuf is currently being borrowed */
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#ifdef DEBUGBUILD
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BIT(warned); /* true after user warned of DEBUGBUILD */
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#endif
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};
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#endif /* HEADER_CURL_MULTIHANDLE_H */
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