#ifndef __CURL_MULTI_H #define __CURL_MULTI_H /*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2007, Daniel Stenberg, <[email protected]>, 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. * * $Id: multi.h,v 1.45 2008-05-20 10:21:50 patrickm Exp $ ***************************************************************************/ /* This is an "external" header file. Don't give away any internals here! GOALS o Enable a "pull" interface. The application that uses libcurl decides where and when to ask libcurl to get/send data. o Enable multiple simultaneous transfers in the same thread without making it complicated for the application. o Enable the application to select() on its own file descriptors and curl's file descriptors simultaneous easily. */ /* * This header file should not really need to include "curl.h" since curl.h * itself includes this file and we expect user applications to do #include * <curl/curl.h> without the need for especially including multi.h. * * For some reason we added this include here at one point, and rather than to * break existing (wrongly written) libcurl applications, we leave it as-is * but with this warning attached. */ #include "curl.h" #ifdef __cplusplus extern "C" { #endif CURLM; CURLMcode; /* just to make code nicer when using curl_multi_socket() you can now check for CURLM_CALL_MULTI_SOCKET too in the same style it works for curl_multi_perform() and CURLM_CALL_MULTI_PERFORM */ #define CURLM_CALL_MULTI_SOCKET … CURLMSG; struct CURLMsg { … }; CURLMsg; /* * Name: curl_multi_init() * * Desc: inititalize multi-style curl usage * * Returns: a new CURLM handle to use in all 'curl_multi' functions. */ CURL_EXTERN CURLM *curl_multi_init(void); /* * Name: curl_multi_add_handle() * * Desc: add a standard curl handle to the multi stack * * Returns: CURLMcode type, general multi error code. */ CURL_EXTERN CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *curl_handle); /* * Name: curl_multi_remove_handle() * * Desc: removes a curl handle from the multi stack again * * Returns: CURLMcode type, general multi error code. */ CURL_EXTERN CURLMcode curl_multi_remove_handle(CURLM *multi_handle, CURL *curl_handle); /* * Name: curl_multi_fdset() * * Desc: Ask curl for its fd_set sets. The app can use these to select() or * poll() on. We want curl_multi_perform() called as soon as one of * them are ready. * * Returns: CURLMcode type, general multi error code. */ CURL_EXTERN CURLMcode curl_multi_fdset(CURLM *multi_handle, fd_set *read_fd_set, fd_set *write_fd_set, fd_set *exc_fd_set, int *max_fd); /* * Name: curl_multi_perform() * * Desc: When the app thinks there's data available for curl it calls this * function to read/write whatever there is right now. This returns * as soon as the reads and writes are done. This function does not * require that there actually is data available for reading or that * data can be written, it can be called just in case. It returns * the number of handles that still transfer data in the second * argument's integer-pointer. * * Returns: CURLMcode type, general multi error code. *NOTE* that this only * returns errors etc regarding the whole multi stack. There might * still have occurred problems on invidual transfers even when this * returns OK. */ CURL_EXTERN CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles); /* * Name: curl_multi_cleanup() * * Desc: Cleans up and removes a whole multi stack. It does not free or * touch any individual easy handles in any way. We need to define * in what state those handles will be if this function is called * in the middle of a transfer. * * Returns: CURLMcode type, general multi error code. */ CURL_EXTERN CURLMcode curl_multi_cleanup(CURLM *multi_handle); /* * Name: curl_multi_info_read() * * Desc: Ask the multi handle if there's any messages/informationals from * the individual transfers. Messages include informationals such as * error code from the transfer or just the fact that a transfer is * completed. More details on these should be written down as well. * * Repeated calls to this function will return a new struct each * time, until a special "end of msgs" struct is returned as a signal * that there is no more to get at this point. * * The data the returned pointer points to will not survive calling * curl_multi_cleanup(). * * The 'CURLMsg' struct is meant to be very simple and only contain * very basic informations. If more involved information is wanted, * we will provide the particular "transfer handle" in that struct * and that should/could/would be used in subsequent * curl_easy_getinfo() calls (or similar). The point being that we * must never expose complex structs to applications, as then we'll * undoubtably get backwards compatibility problems in the future. * * Returns: A pointer to a filled-in struct, or NULL if it failed or ran out * of structs. It also writes the number of messages left in the * queue (after this read) in the integer the second argument points * to. */ CURL_EXTERN CURLMsg *curl_multi_info_read(CURLM *multi_handle, int *msgs_in_queue); /* * Name: curl_multi_strerror() * * Desc: The curl_multi_strerror function may be used to turn a CURLMcode * value into the equivalent human readable error string. This is * useful for printing meaningful error messages. * * Returns: A pointer to a zero-terminated error message. */ CURL_EXTERN const char *curl_multi_strerror(CURLMcode); /* * Name: curl_multi_socket() and * curl_multi_socket_all() * * Desc: An alternative version of curl_multi_perform() that allows the * application to pass in one of the file descriptors that have been * detected to have "action" on them and let libcurl perform. * See man page for details. */ #define CURL_POLL_NONE … #define CURL_POLL_IN … #define CURL_POLL_OUT … #define CURL_POLL_INOUT … #define CURL_POLL_REMOVE … #define CURL_SOCKET_TIMEOUT … #define CURL_CSELECT_IN … #define CURL_CSELECT_OUT … #define CURL_CSELECT_ERR … curl_socket_callback; /* private socket pointer */ /* * Name: curl_multi_timer_callback * * Desc: Called by libcurl whenever the library detects a change in the * maximum number of milliseconds the app is allowed to wait before * curl_multi_socket() or curl_multi_perform() must be called * (to allow libcurl's timed events to take place). * * Returns: The callback should return zero. */ curl_multi_timer_callback; /* private callback pointer */ CURL_EXTERN CURLMcode curl_multi_socket(CURLM *multi_handle, curl_socket_t s, int *running_handles); CURL_EXTERN CURLMcode curl_multi_socket_action(CURLM *multi_handle, curl_socket_t s, int ev_bitmask, int *running_handles); CURL_EXTERN CURLMcode curl_multi_socket_all(CURLM *multi_handle, int *running_handles); #ifndef CURL_ALLOW_OLD_MULTI_SOCKET /* This macro below was added in 7.16.3 to push users who recompile to use the new curl_multi_socket_action() instead of the old curl_multi_socket() */ #define curl_multi_socket(x,y,z) … #endif /* * Name: curl_multi_timeout() * * Desc: Returns the maximum number of milliseconds the app is allowed to * wait before curl_multi_socket() or curl_multi_perform() must be * called (to allow libcurl's timed events to take place). * * Returns: CURLM error code. */ CURL_EXTERN CURLMcode curl_multi_timeout(CURLM *multi_handle, long *milliseconds); #undef CINIT /* re-using the same name as in curl.h */ #ifdef CURL_ISOCPP #define CINIT(name,type,num) … #else /* The macro "##" is ISO C, we assume pre-ISO C doesn't support it. */ #define LONG … #define OBJECTPOINT … #define FUNCTIONPOINT … #define OFF_T … #define CINIT … #endif CURLMoption; /* * Name: curl_multi_setopt() * * Desc: Sets options for the multi handle. * * Returns: CURLM error code. */ CURL_EXTERN CURLMcode curl_multi_setopt(CURLM *multi_handle, CURLMoption option, ...); /* * Name: curl_multi_assign() * * Desc: This function sets an association in the multi handle between the * given socket and a private pointer of the application. This is * (only) useful for curl_multi_socket uses. * * Returns: CURLM error code. */ CURL_EXTERN CURLMcode curl_multi_assign(CURLM *multi_handle, curl_socket_t sockfd, void *sockp); #ifdef __cplusplus } /* end of extern "C" */ #endif #endif
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