[164] | 1 | #ifndef __CURL_MULTI_H
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| 2 | #define __CURL_MULTI_H
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| 3 | /***************************************************************************
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| 4 | * _ _ ____ _
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| 5 | * Project ___| | | | _ \| |
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| 6 | * / __| | | | |_) | |
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| 7 | * | (__| |_| | _ <| |___
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| 8 | * \___|\___/|_| \_\_____|
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| 9 | *
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| 10 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 11 | *
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| 12 | * This software is licensed as described in the file COPYING, which
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| 13 | * you should have received as part of this distribution. The terms
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| 14 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 15 | *
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| 16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 17 | * copies of the Software, and permit persons to whom the Software is
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| 18 | * furnished to do so, under the terms of the COPYING file.
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| 19 | *
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| 20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 21 | * KIND, either express or implied.
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 | /*
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| 25 | This is an "external" header file. Don't give away any internals here!
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| 26 |
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| 27 | GOALS
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| 28 |
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| 29 | o Enable a "pull" interface. The application that uses libcurl decides where
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| 30 | and when to ask libcurl to get/send data.
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| 31 |
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| 32 | o Enable multiple simultaneous transfers in the same thread without making it
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| 33 | complicated for the application.
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| 34 |
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| 35 | o Enable the application to select() on its own file descriptors and curl's
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| 36 | file descriptors simultaneous easily.
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| 37 |
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| 38 | */
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| 39 |
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| 40 | /*
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| 41 | * This header file should not really need to include "curl.h" since curl.h
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| 42 | * itself includes this file and we expect user applications to do #include
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| 43 | * <curl/curl.h> without the need for especially including multi.h.
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| 44 | *
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| 45 | * For some reason we added this include here at one point, and rather than to
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| 46 | * break existing (wrongly written) libcurl applications, we leave it as-is
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| 47 | * but with this warning attached.
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| 48 | */
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| 49 | #include "curl.h"
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| 50 |
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| 51 | #ifdef __cplusplus
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| 52 | extern "C" {
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| 53 | #endif
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| 54 |
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| 55 | typedef void CURLM;
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| 56 |
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| 57 | typedef enum {
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| 58 | CURLM_CALL_MULTI_PERFORM = -1, /* please call curl_multi_perform() or
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| 59 | curl_multi_socket*() soon */
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| 60 | CURLM_OK,
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| 61 | CURLM_BAD_HANDLE, /* the passed-in handle is not a valid CURLM handle */
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| 62 | CURLM_BAD_EASY_HANDLE, /* an easy handle was not good/valid */
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| 63 | CURLM_OUT_OF_MEMORY, /* if you ever get this, you're in deep sh*t */
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| 64 | CURLM_INTERNAL_ERROR, /* this is a libcurl bug */
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| 65 | CURLM_BAD_SOCKET, /* the passed in socket argument did not match */
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| 66 | CURLM_UNKNOWN_OPTION, /* curl_multi_setopt() with unsupported option */
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| 67 | CURLM_ADDED_ALREADY, /* an easy handle already added to a multi handle was
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| 68 | attempted to get added - again */
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| 69 | CURLM_LAST
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| 70 | } CURLMcode;
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| 71 |
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| 72 | /* just to make code nicer when using curl_multi_socket() you can now check
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| 73 | for CURLM_CALL_MULTI_SOCKET too in the same style it works for
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| 74 | curl_multi_perform() and CURLM_CALL_MULTI_PERFORM */
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| 75 | #define CURLM_CALL_MULTI_SOCKET CURLM_CALL_MULTI_PERFORM
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| 76 |
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| 77 | /* bitmask bits for CURLMOPT_PIPELINING */
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| 78 | #define CURLPIPE_NOTHING 0L
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| 79 | #define CURLPIPE_HTTP1 1L
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| 80 | #define CURLPIPE_MULTIPLEX 2L
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| 81 |
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| 82 | typedef enum {
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| 83 | CURLMSG_NONE, /* first, not used */
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| 84 | CURLMSG_DONE, /* This easy handle has completed. 'result' contains
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| 85 | the CURLcode of the transfer */
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| 86 | CURLMSG_LAST /* last, not used */
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| 87 | } CURLMSG;
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| 88 |
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| 89 | struct CURLMsg {
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| 90 | CURLMSG msg; /* what this message means */
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| 91 | CURL *easy_handle; /* the handle it concerns */
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| 92 | union {
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| 93 | void *whatever; /* message-specific data */
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| 94 | CURLcode result; /* return code for transfer */
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| 95 | } data;
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| 96 | };
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| 97 | typedef struct CURLMsg CURLMsg;
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| 98 |
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| 99 | /* Based on poll(2) structure and values.
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| 100 | * We don't use pollfd and POLL* constants explicitly
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| 101 | * to cover platforms without poll(). */
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| 102 | #define CURL_WAIT_POLLIN 0x0001
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| 103 | #define CURL_WAIT_POLLPRI 0x0002
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| 104 | #define CURL_WAIT_POLLOUT 0x0004
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| 105 |
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| 106 | struct curl_waitfd {
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| 107 | curl_socket_t fd;
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| 108 | short events;
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| 109 | short revents; /* not supported yet */
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| 110 | };
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| 111 |
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| 112 | /*
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| 113 | * Name: curl_multi_init()
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| 114 | *
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| 115 | * Desc: inititalize multi-style curl usage
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| 116 | *
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| 117 | * Returns: a new CURLM handle to use in all 'curl_multi' functions.
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| 118 | */
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| 119 | CURL_EXTERN CURLM *curl_multi_init(void);
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| 120 |
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| 121 | /*
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| 122 | * Name: curl_multi_add_handle()
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| 123 | *
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| 124 | * Desc: add a standard curl handle to the multi stack
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| 125 | *
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| 126 | * Returns: CURLMcode type, general multi error code.
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| 127 | */
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| 128 | CURL_EXTERN CURLMcode curl_multi_add_handle(CURLM *multi_handle,
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| 129 | CURL *curl_handle);
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| 130 |
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| 131 | /*
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| 132 | * Name: curl_multi_remove_handle()
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| 133 | *
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| 134 | * Desc: removes a curl handle from the multi stack again
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| 135 | *
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| 136 | * Returns: CURLMcode type, general multi error code.
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| 137 | */
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| 138 | CURL_EXTERN CURLMcode curl_multi_remove_handle(CURLM *multi_handle,
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| 139 | CURL *curl_handle);
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| 140 |
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| 141 | /*
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| 142 | * Name: curl_multi_fdset()
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| 143 | *
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| 144 | * Desc: Ask curl for its fd_set sets. The app can use these to select() or
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| 145 | * poll() on. We want curl_multi_perform() called as soon as one of
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| 146 | * them are ready.
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| 147 | *
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| 148 | * Returns: CURLMcode type, general multi error code.
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| 149 | */
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| 150 | CURL_EXTERN CURLMcode curl_multi_fdset(CURLM *multi_handle,
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| 151 | fd_set *read_fd_set,
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| 152 | fd_set *write_fd_set,
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| 153 | fd_set *exc_fd_set,
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| 154 | int *max_fd);
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| 155 |
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| 156 | /*
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| 157 | * Name: curl_multi_wait()
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| 158 | *
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| 159 | * Desc: Poll on all fds within a CURLM set as well as any
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| 160 | * additional fds passed to the function.
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| 161 | *
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| 162 | * Returns: CURLMcode type, general multi error code.
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| 163 | */
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| 164 | CURL_EXTERN CURLMcode curl_multi_wait(CURLM *multi_handle,
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| 165 | struct curl_waitfd extra_fds[],
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| 166 | unsigned int extra_nfds,
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| 167 | int timeout_ms,
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| 168 | int *ret);
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| 169 |
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| 170 | /*
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| 171 | * Name: curl_multi_perform()
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| 172 | *
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| 173 | * Desc: When the app thinks there's data available for curl it calls this
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| 174 | * function to read/write whatever there is right now. This returns
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| 175 | * as soon as the reads and writes are done. This function does not
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| 176 | * require that there actually is data available for reading or that
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| 177 | * data can be written, it can be called just in case. It returns
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| 178 | * the number of handles that still transfer data in the second
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| 179 | * argument's integer-pointer.
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| 180 | *
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| 181 | * Returns: CURLMcode type, general multi error code. *NOTE* that this only
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| 182 | * returns errors etc regarding the whole multi stack. There might
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| 183 | * still have occurred problems on invidual transfers even when this
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| 184 | * returns OK.
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| 185 | */
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| 186 | CURL_EXTERN CURLMcode curl_multi_perform(CURLM *multi_handle,
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| 187 | int *running_handles);
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| 188 |
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| 189 | /*
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| 190 | * Name: curl_multi_cleanup()
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| 191 | *
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| 192 | * Desc: Cleans up and removes a whole multi stack. It does not free or
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| 193 | * touch any individual easy handles in any way. We need to define
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| 194 | * in what state those handles will be if this function is called
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| 195 | * in the middle of a transfer.
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| 196 | *
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| 197 | * Returns: CURLMcode type, general multi error code.
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| 198 | */
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| 199 | CURL_EXTERN CURLMcode curl_multi_cleanup(CURLM *multi_handle);
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| 200 |
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| 201 | /*
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| 202 | * Name: curl_multi_info_read()
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| 203 | *
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| 204 | * Desc: Ask the multi handle if there's any messages/informationals from
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| 205 | * the individual transfers. Messages include informationals such as
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| 206 | * error code from the transfer or just the fact that a transfer is
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| 207 | * completed. More details on these should be written down as well.
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| 208 | *
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| 209 | * Repeated calls to this function will return a new struct each
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| 210 | * time, until a special "end of msgs" struct is returned as a signal
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| 211 | * that there is no more to get at this point.
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| 212 | *
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| 213 | * The data the returned pointer points to will not survive calling
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| 214 | * curl_multi_cleanup().
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| 215 | *
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| 216 | * The 'CURLMsg' struct is meant to be very simple and only contain
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| 217 | * very basic informations. If more involved information is wanted,
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| 218 | * we will provide the particular "transfer handle" in that struct
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| 219 | * and that should/could/would be used in subsequent
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| 220 | * curl_easy_getinfo() calls (or similar). The point being that we
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| 221 | * must never expose complex structs to applications, as then we'll
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| 222 | * undoubtably get backwards compatibility problems in the future.
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| 223 | *
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| 224 | * Returns: A pointer to a filled-in struct, or NULL if it failed or ran out
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| 225 | * of structs. It also writes the number of messages left in the
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| 226 | * queue (after this read) in the integer the second argument points
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| 227 | * to.
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| 228 | */
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| 229 | CURL_EXTERN CURLMsg *curl_multi_info_read(CURLM *multi_handle,
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| 230 | int *msgs_in_queue);
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| 231 |
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| 232 | /*
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| 233 | * Name: curl_multi_strerror()
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| 234 | *
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| 235 | * Desc: The curl_multi_strerror function may be used to turn a CURLMcode
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| 236 | * value into the equivalent human readable error string. This is
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| 237 | * useful for printing meaningful error messages.
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| 238 | *
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| 239 | * Returns: A pointer to a zero-terminated error message.
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| 240 | */
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| 241 | CURL_EXTERN const char *curl_multi_strerror(CURLMcode);
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| 242 |
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| 243 | /*
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| 244 | * Name: curl_multi_socket() and
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| 245 | * curl_multi_socket_all()
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| 246 | *
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| 247 | * Desc: An alternative version of curl_multi_perform() that allows the
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| 248 | * application to pass in one of the file descriptors that have been
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| 249 | * detected to have "action" on them and let libcurl perform.
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| 250 | * See man page for details.
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| 251 | */
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| 252 | #define CURL_POLL_NONE 0
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| 253 | #define CURL_POLL_IN 1
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| 254 | #define CURL_POLL_OUT 2
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| 255 | #define CURL_POLL_INOUT 3
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| 256 | #define CURL_POLL_REMOVE 4
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| 257 |
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| 258 | #define CURL_SOCKET_TIMEOUT CURL_SOCKET_BAD
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| 259 |
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| 260 | #define CURL_CSELECT_IN 0x01
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| 261 | #define CURL_CSELECT_OUT 0x02
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| 262 | #define CURL_CSELECT_ERR 0x04
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| 263 |
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| 264 | typedef int (*curl_socket_callback)(CURL *easy, /* easy handle */
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| 265 | curl_socket_t s, /* socket */
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| 266 | int what, /* see above */
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| 267 | void *userp, /* private callback
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| 268 | pointer */
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| 269 | void *socketp); /* private socket
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| 270 | pointer */
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| 271 | /*
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| 272 | * Name: curl_multi_timer_callback
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| 273 | *
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| 274 | * Desc: Called by libcurl whenever the library detects a change in the
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| 275 | * maximum number of milliseconds the app is allowed to wait before
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| 276 | * curl_multi_socket() or curl_multi_perform() must be called
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| 277 | * (to allow libcurl's timed events to take place).
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| 278 | *
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| 279 | * Returns: The callback should return zero.
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| 280 | */
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| 281 | typedef int (*curl_multi_timer_callback)(CURLM *multi, /* multi handle */
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| 282 | long timeout_ms, /* see above */
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| 283 | void *userp); /* private callback
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| 284 | pointer */
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| 285 |
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| 286 | CURL_EXTERN CURLMcode curl_multi_socket(CURLM *multi_handle, curl_socket_t s,
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| 287 | int *running_handles);
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| 288 |
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| 289 | CURL_EXTERN CURLMcode curl_multi_socket_action(CURLM *multi_handle,
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| 290 | curl_socket_t s,
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| 291 | int ev_bitmask,
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| 292 | int *running_handles);
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| 293 |
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| 294 | CURL_EXTERN CURLMcode curl_multi_socket_all(CURLM *multi_handle,
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| 295 | int *running_handles);
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| 296 |
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| 297 | #ifndef CURL_ALLOW_OLD_MULTI_SOCKET
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| 298 | /* This macro below was added in 7.16.3 to push users who recompile to use
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| 299 | the new curl_multi_socket_action() instead of the old curl_multi_socket()
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| 300 | */
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| 301 | #define curl_multi_socket(x,y,z) curl_multi_socket_action(x,y,0,z)
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| 302 | #endif
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| 303 |
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| 304 | /*
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| 305 | * Name: curl_multi_timeout()
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| 306 | *
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| 307 | * Desc: Returns the maximum number of milliseconds the app is allowed to
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| 308 | * wait before curl_multi_socket() or curl_multi_perform() must be
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| 309 | * called (to allow libcurl's timed events to take place).
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| 310 | *
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| 311 | * Returns: CURLM error code.
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| 312 | */
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| 313 | CURL_EXTERN CURLMcode curl_multi_timeout(CURLM *multi_handle,
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| 314 | long *milliseconds);
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| 315 |
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| 316 | #undef CINIT /* re-using the same name as in curl.h */
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| 317 |
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| 318 | #ifdef CURL_ISOCPP
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| 319 | #define CINIT(name,type,num) CURLMOPT_ ## name = CURLOPTTYPE_ ## type + num
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| 320 | #else
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| 321 | /* The macro "##" is ISO C, we assume pre-ISO C doesn't support it. */
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| 322 | #define LONG CURLOPTTYPE_LONG
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| 323 | #define OBJECTPOINT CURLOPTTYPE_OBJECTPOINT
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| 324 | #define FUNCTIONPOINT CURLOPTTYPE_FUNCTIONPOINT
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| 325 | #define OFF_T CURLOPTTYPE_OFF_T
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| 326 | #define CINIT(name,type,number) CURLMOPT_/**/name = type + number
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| 327 | #endif
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| 328 |
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| 329 | typedef enum {
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| 330 | /* This is the socket callback function pointer */
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| 331 | CINIT(SOCKETFUNCTION, FUNCTIONPOINT, 1),
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| 332 |
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| 333 | /* This is the argument passed to the socket callback */
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| 334 | CINIT(SOCKETDATA, OBJECTPOINT, 2),
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| 335 |
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| 336 | /* set to 1 to enable pipelining for this multi handle */
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| 337 | CINIT(PIPELINING, LONG, 3),
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| 338 |
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| 339 | /* This is the timer callback function pointer */
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| 340 | CINIT(TIMERFUNCTION, FUNCTIONPOINT, 4),
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| 341 |
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| 342 | /* This is the argument passed to the timer callback */
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| 343 | CINIT(TIMERDATA, OBJECTPOINT, 5),
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| 344 |
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| 345 | /* maximum number of entries in the connection cache */
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| 346 | CINIT(MAXCONNECTS, LONG, 6),
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| 347 |
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| 348 | /* maximum number of (pipelining) connections to one host */
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| 349 | CINIT(MAX_HOST_CONNECTIONS, LONG, 7),
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| 350 |
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| 351 | /* maximum number of requests in a pipeline */
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| 352 | CINIT(MAX_PIPELINE_LENGTH, LONG, 8),
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| 353 |
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| 354 | /* a connection with a content-length longer than this
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| 355 | will not be considered for pipelining */
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| 356 | CINIT(CONTENT_LENGTH_PENALTY_SIZE, OFF_T, 9),
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| 357 |
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| 358 | /* a connection with a chunk length longer than this
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| 359 | will not be considered for pipelining */
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| 360 | CINIT(CHUNK_LENGTH_PENALTY_SIZE, OFF_T, 10),
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| 361 |
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| 362 | /* a list of site names(+port) that are blacklisted from
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| 363 | pipelining */
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| 364 | CINIT(PIPELINING_SITE_BL, OBJECTPOINT, 11),
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| 365 |
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| 366 | /* a list of server types that are blacklisted from
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| 367 | pipelining */
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| 368 | CINIT(PIPELINING_SERVER_BL, OBJECTPOINT, 12),
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| 369 |
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| 370 | /* maximum number of open connections in total */
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| 371 | CINIT(MAX_TOTAL_CONNECTIONS, LONG, 13),
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| 372 |
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| 373 | /* This is the server push callback function pointer */
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| 374 | CINIT(PUSHFUNCTION, FUNCTIONPOINT, 14),
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| 375 |
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| 376 | /* This is the argument passed to the server push callback */
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| 377 | CINIT(PUSHDATA, OBJECTPOINT, 15),
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| 378 |
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| 379 | CURLMOPT_LASTENTRY /* the last unused */
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| 380 | } CURLMoption;
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| 381 |
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| 382 |
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| 383 | /*
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| 384 | * Name: curl_multi_setopt()
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| 385 | *
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| 386 | * Desc: Sets options for the multi handle.
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| 387 | *
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| 388 | * Returns: CURLM error code.
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| 389 | */
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| 390 | CURL_EXTERN CURLMcode curl_multi_setopt(CURLM *multi_handle,
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| 391 | CURLMoption option, ...);
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| 392 |
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| 393 |
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| 394 | /*
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| 395 | * Name: curl_multi_assign()
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| 396 | *
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| 397 | * Desc: This function sets an association in the multi handle between the
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| 398 | * given socket and a private pointer of the application. This is
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| 399 | * (only) useful for curl_multi_socket uses.
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| 400 | *
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| 401 | * Returns: CURLM error code.
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| 402 | */
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| 403 | CURL_EXTERN CURLMcode curl_multi_assign(CURLM *multi_handle,
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| 404 | curl_socket_t sockfd, void *sockp);
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| 405 |
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| 406 |
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| 407 | /*
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| 408 | * Name: curl_push_callback
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| 409 | *
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| 410 | * Desc: This callback gets called when a new stream is being pushed by the
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| 411 | * server. It approves or denies the new stream.
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| 412 | *
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| 413 | * Returns: CURL_PUSH_OK or CURL_PUSH_DENY.
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| 414 | */
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| 415 | #define CURL_PUSH_OK 0
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| 416 | #define CURL_PUSH_DENY 1
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| 417 |
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| 418 | struct curl_pushheaders; /* forward declaration only */
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| 419 |
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| 420 | CURL_EXTERN char *curl_pushheader_bynum(struct curl_pushheaders *h,
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| 421 | size_t num);
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| 422 | CURL_EXTERN char *curl_pushheader_byname(struct curl_pushheaders *h,
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| 423 | const char *name);
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| 424 |
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| 425 | typedef int (*curl_push_callback)(CURL *parent,
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| 426 | CURL *easy,
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| 427 | size_t num_headers,
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| 428 | struct curl_pushheaders *headers,
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| 429 | void *userp);
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| 430 |
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| 431 | #ifdef __cplusplus
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| 432 | } /* end of extern "C" */
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| 433 | #endif
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| 434 |
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| 435 | #endif
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