| #ifndef __CURL_MULTI_H |
| #define __CURL_MULTI_H |
| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2007, 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. |
| * |
| * $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 |
| |
| typedef void CURLM; |
| |
| typedef enum { |
| CURLM_CALL_MULTI_PERFORM = -1, /* please call curl_multi_perform() or |
| curl_multi_socket*() soon */ |
| CURLM_OK, |
| CURLM_BAD_HANDLE, /* the passed-in handle is not a valid CURLM handle */ |
| CURLM_BAD_EASY_HANDLE, /* an easy handle was not good/valid */ |
| CURLM_OUT_OF_MEMORY, /* if you ever get this, you're in deep sh*t */ |
| CURLM_INTERNAL_ERROR, /* this is a libcurl bug */ |
| CURLM_BAD_SOCKET, /* the passed in socket argument did not match */ |
| CURLM_UNKNOWN_OPTION, /* curl_multi_setopt() with unsupported option */ |
| CURLM_LAST |
| } 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 CURLM_CALL_MULTI_PERFORM |
| |
| typedef enum { |
| CURLMSG_NONE, /* first, not used */ |
| CURLMSG_DONE, /* This easy handle has completed. 'result' contains |
| the CURLcode of the transfer */ |
| CURLMSG_LAST /* last, not used */ |
| } CURLMSG; |
| |
| struct CURLMsg { |
| CURLMSG msg; /* what this message means */ |
| CURL *easy_handle; /* the handle it concerns */ |
| union { |
| void *whatever; /* message-specific data */ |
| CURLcode result; /* return code for transfer */ |
| } data; |
| }; |
| typedef 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 0 |
| #define CURL_POLL_IN 1 |
| #define CURL_POLL_OUT 2 |
| #define CURL_POLL_INOUT 3 |
| #define CURL_POLL_REMOVE 4 |
| |
| #define CURL_SOCKET_TIMEOUT CURL_SOCKET_BAD |
| |
| #define CURL_CSELECT_IN 0x01 |
| #define CURL_CSELECT_OUT 0x02 |
| #define CURL_CSELECT_ERR 0x04 |
| |
| typedef int (*curl_socket_callback)(CURL *easy, /* easy handle */ |
| curl_socket_t s, /* socket */ |
| int what, /* see above */ |
| void *userp, /* private callback |
| pointer */ |
| void *socketp); /* 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. |
| */ |
| typedef int (*curl_multi_timer_callback)(CURLM *multi, /* multi handle */ |
| long timeout_ms, /* see above */ |
| void *userp); /* 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) curl_multi_socket_action(x,y,0,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) CURLMOPT_ ## name = CURLOPTTYPE_ ## type + num |
| #else |
| /* The macro "##" is ISO C, we assume pre-ISO C doesn't support it. */ |
| #define LONG CURLOPTTYPE_LONG |
| #define OBJECTPOINT CURLOPTTYPE_OBJECTPOINT |
| #define FUNCTIONPOINT CURLOPTTYPE_FUNCTIONPOINT |
| #define OFF_T CURLOPTTYPE_OFF_T |
| #define CINIT(name,type,number) CURLMOPT_/**/name = type + number |
| #endif |
| |
| typedef enum { |
| /* This is the socket callback function pointer */ |
| CINIT(SOCKETFUNCTION, FUNCTIONPOINT, 1), |
| |
| /* This is the argument passed to the socket callback */ |
| CINIT(SOCKETDATA, OBJECTPOINT, 2), |
| |
| /* set to 1 to enable pipelining for this multi handle */ |
| CINIT(PIPELINING, LONG, 3), |
| |
| /* This is the timer callback function pointer */ |
| CINIT(TIMERFUNCTION, FUNCTIONPOINT, 4), |
| |
| /* This is the argument passed to the timer callback */ |
| CINIT(TIMERDATA, OBJECTPOINT, 5), |
| |
| /* maximum number of entries in the connection cache */ |
| CINIT(MAXCONNECTS, LONG, 6), |
| |
| CURLMOPT_LASTENTRY /* the last unused */ |
| } 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 |
