curl/lib/pingpong.h

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5.1 KiB
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#ifndef HEADER_CURL_PINGPONG_H
#define HEADER_CURL_PINGPONG_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, 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 http://curl.haxx.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.
*
***************************************************************************/
build: fix circular header inclusion with other packages This commit renames lib/setup.h to lib/curl_setup.h and renames lib/setup_once.h to lib/curl_setup_once.h. Removes the need and usage of a header inclusion guard foreign to libcurl. [1] Removes the need and presence of an alarming notice we carried in old setup_once.h [2] ---------------------------------------- 1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H, this single inclusion guard is enough to ensure that inclusion of lib/setup_once.h done from lib/setup.h is only done once. Additionally lib/setup.h has always used __SETUP_ONCE_H macro to protect inclusion of setup_once.h even after commit ec691ca3, this was to avoid a circular header inclusion triggered when building a c-ares enabled version with c-ares sources available which also has a setup_once.h header. Commit ec691ca3 exposes the real nature of __SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard foreign to libcurl belonging to c-ares's setup_once.h The renaming this commit does, fixes the circular header inclusion, and as such removes the need and usage of a header inclusion guard foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl. 2 - Due to the circular interdependency of old lib/setup_once.h and the c-ares setup_once.h header, old file lib/setup_once.h has carried back from 2006 up to now days an alarming and prominent notice about the need of keeping libcurl's and c-ares's setup_once.h in sync. Given that this commit fixes the circular interdependency, the need and presence of mentioned notice is removed. All mentioned interdependencies come back from now old days when the c-ares project lived inside a curl subdirectory. This commit removes last traces of such fact.
2013-01-06 22:06:49 +04:00
#include "curl_setup.h"
#if !defined(CURL_DISABLE_IMAP) || !defined(CURL_DISABLE_FTP) || \
!defined(CURL_DISABLE_POP3) || !defined(CURL_DISABLE_SMTP)
#define USE_PINGPONG
#endif
/* forward-declaration, this is defined in urldata.h */
struct connectdata;
/*
* 'pingpong' is the generic struct used for protocols doing server<->client
* conversations in a back-and-forth style such as FTP, IMAP, POP3, SMTP etc.
*
* It holds response cache and non-blocking sending data.
*/
struct pingpong {
char *cache; /* data cache between getresponse()-calls */
size_t cache_size; /* size of cache in bytes */
size_t nread_resp; /* number of bytes currently read of a server response */
char *linestart_resp; /* line start pointer for the server response
reader function */
bool pending_resp; /* set TRUE when a server response is pending or in
progress, and is cleared once the last response is
read */
char *sendthis; /* allocated pointer to a buffer that is to be sent to the
server */
size_t sendleft; /* number of bytes left to send from the sendthis buffer */
size_t sendsize; /* total size of the sendthis buffer */
struct timeval response; /* set to Curl_tvnow() when a command has been sent
off, used to time-out response reading */
long response_time; /* When no timeout is given, this is the amount of
milliseconds we await for a server response. */
struct connectdata *conn; /* points to the connectdata struct that this
belongs to */
/* Function pointers the protocols MUST implement and provide for the
pingpong layer to function */
CURLcode (*statemach_act)(struct connectdata *conn);
bool (*endofresp)(struct connectdata *conn, char *ptr, size_t len,
int *code);
};
/*
* Curl_pp_statemach()
*
* called repeatedly until done. Set 'wait' to make it wait a while on the
* socket if there's no traffic.
*/
CURLcode Curl_pp_statemach(struct pingpong *pp, bool block);
/* initialize stuff to prepare for reading a fresh new response */
void Curl_pp_init(struct pingpong *pp);
/* Returns timeout in ms. 0 or negative number means the timeout has already
triggered */
long Curl_pp_state_timeout(struct pingpong *pp);
/***********************************************************************
*
* Curl_pp_sendf()
*
* Send the formated string as a command to a pingpong server. Note that
* the string should not have any CRLF appended, as this function will
* append the necessary things itself.
*
* made to never block
*/
CURLcode Curl_pp_sendf(struct pingpong *pp,
const char *fmt, ...);
/***********************************************************************
*
* Curl_pp_vsendf()
*
* Send the formated string as a command to a pingpong server. Note that
* the string should not have any CRLF appended, as this function will
* append the necessary things itself.
*
* made to never block
*/
CURLcode Curl_pp_vsendf(struct pingpong *pp,
const char *fmt,
va_list args);
/*
* Curl_pp_readresp()
*
* Reads a piece of a server response.
*/
CURLcode Curl_pp_readresp(curl_socket_t sockfd,
struct pingpong *pp,
int *code, /* return the server code if done */
size_t *size); /* size of the response */
CURLcode Curl_pp_flushsend(struct pingpong *pp);
/* call this when a pingpong connection is disconnected */
CURLcode Curl_pp_disconnect(struct pingpong *pp);
int Curl_pp_getsock(struct pingpong *pp, curl_socket_t *socks,
int numsocks);
/***********************************************************************
*
* Curl_pp_moredata()
*
* Returns whether there are still more data in the cache and so a call
* to Curl_pp_readresp() will not block.
*/
bool Curl_pp_moredata(struct pingpong *pp);
#endif /* HEADER_CURL_PINGPONG_H */