/
multihandle.h
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/
multihandle.h
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#ifndef HEADER_CURL_MULTIHANDLE_H
#define HEADER_CURL_MULTIHANDLE_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "llist.h"
#include "hash.h"
#include "conncache.h"
#include "psl.h"
#include "socketpair.h"
struct connectdata;
struct Curl_message {
struct Curl_llist_element list;
/* the 'CURLMsg' is the part that is visible to the external user */
struct CURLMsg extmsg;
};
/* NOTE: if you add a state here, add the name to the statename[] array as
well!
*/
typedef enum {
MSTATE_INIT, /* 0 - start in this state */
MSTATE_PENDING, /* 1 - no connections, waiting for one */
MSTATE_CONNECT, /* 2 - resolve/connect has been sent off */
MSTATE_RESOLVING, /* 3 - awaiting the resolve to finalize */
MSTATE_CONNECTING, /* 4 - awaiting the TCP connect to finalize */
MSTATE_TUNNELING, /* 5 - awaiting HTTPS proxy SSL initialization to
complete and/or proxy CONNECT to finalize */
MSTATE_PROTOCONNECT, /* 6 - initiate protocol connect procedure */
MSTATE_PROTOCONNECTING, /* 7 - completing the protocol-specific connect
phase */
MSTATE_DO, /* 8 - start send off the request (part 1) */
MSTATE_DOING, /* 9 - sending off the request (part 1) */
MSTATE_DOING_MORE, /* 10 - send off the request (part 2) */
MSTATE_DID, /* 11 - done sending off request */
MSTATE_PERFORMING, /* 12 - transfer data */
MSTATE_RATELIMITING, /* 13 - wait because limit-rate exceeded */
MSTATE_DONE, /* 14 - post data transfer operation */
MSTATE_COMPLETED, /* 15 - operation complete */
MSTATE_MSGSENT, /* 16 - the operation complete message is sent */
MSTATE_LAST /* 17 - not a true state, never use this */
} CURLMstate;
/* we support N sockets per easy handle. Set the corresponding bit to what
action we should wait for */
#define MAX_SOCKSPEREASYHANDLE 5
#define GETSOCK_READABLE (0x00ff)
#define GETSOCK_WRITABLE (0xff00)
#define CURLPIPE_ANY (CURLPIPE_MULTIPLEX)
#if !defined(CURL_DISABLE_SOCKETPAIR)
#define ENABLE_WAKEUP
#endif
/* value for MAXIMUM CONCURRENT STREAMS upper limit */
#define INITIAL_MAX_CONCURRENT_STREAMS ((1U << 31) - 1)
/* This is the struct known as CURLM on the outside */
struct Curl_multi {
/* First a simple identifier to easier detect if a user mix up
this multi handle with an easy handle. Set this to CURL_MULTI_HANDLE. */
unsigned int magic;
/* We have a doubly-linked list with easy handles */
struct Curl_easy *easyp;
struct Curl_easy *easylp; /* last node */
int num_easy; /* amount of entries in the linked list above. */
int num_alive; /* amount of easy handles that are added but have not yet
reached COMPLETE state */
struct Curl_llist msglist; /* a list of messages from completed transfers */
struct Curl_llist pending; /* Curl_easys that are in the
MSTATE_PENDING state */
/* callback function and user data pointer for the *socket() API */
curl_socket_callback socket_cb;
void *socket_userp;
/* callback function and user data pointer for server push */
curl_push_callback push_cb;
void *push_userp;
/* Hostname cache */
struct Curl_hash hostcache;
#ifdef USE_LIBPSL
/* PSL cache. */
struct PslCache psl;
#endif
/* timetree points to the splay-tree of time nodes to figure out expire
times of all currently set timers */
struct Curl_tree *timetree;
/* 'sockhash' is the lookup hash for socket descriptor => easy handles (note
the pluralis form, there can be more than one easy handle waiting on the
same actual socket) */
struct Curl_hash sockhash;
/* Shared connection cache (bundles)*/
struct conncache conn_cache;
long maxconnects; /* if >0, a fixed limit of the maximum number of entries
we're allowed to grow the connection cache to */
long max_host_connections; /* if >0, a fixed limit of the maximum number
of connections per host */
long max_total_connections; /* if >0, a fixed limit of the maximum number
of connections in total */
/* timer callback and user data pointer for the *socket() API */
curl_multi_timer_callback timer_cb;
void *timer_userp;
struct curltime timer_lastcall; /* the fixed time for the timeout for the
previous callback */
unsigned int max_concurrent_streams;
#ifdef USE_WINSOCK
WSAEVENT wsa_event; /* winsock event used for waits */
#else
#ifdef ENABLE_WAKEUP
curl_socket_t wakeup_pair[2]; /* socketpair() used for wakeup
0 is used for read, 1 is used for write */
#endif
#endif
/* multiplexing wanted */
bool multiplexing;
bool recheckstate; /* see Curl_multi_connchanged */
bool in_callback; /* true while executing a callback */
bool ipv6_works;
};
#endif /* HEADER_CURL_MULTIHANDLE_H */