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curl_multi_setopt(3) Library Functions Manual curl_multi_setopt(3) NAME curl_multi_setopt - set options for a curl multi handle SYNOPSIS #include <curl/curl.h> CURLMcode curl_multi_setopt(CURLM *multi, CURLMoption option, parameter); DESCRIPTION curl_multi_setopt(3) is used to tell a libcurl multi handle how to behave. By using the appropriate options to curl_multi_setopt(3), you can change libcurl's behavior when using that multi handle. All options are set with the option followed by the parameter. That parameter can be a long, a func- tion pointer, an object pointer or a curl_off_t type, depending on what the specific option expects. Read this manual carefully as bad input values may cause libcurl to behave badly. You can only set one option in each function call. OPTIONS CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE deprecated See CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE(3) CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE deprecated See CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE(3) CURLMOPT_MAXCONNECTS Size of connection cache. See CURLMOPT_MAXCONNECTS(3) CURLMOPT_MAX_CONCURRENT_STREAMS Max concurrent streams for http2. See CURLMOPT_MAX_CONCUR- RENT_STREAMS(3) CURLMOPT_MAX_HOST_CONNECTIONS Max number of connections to a single host. See CURL- MOPT_MAX_HOST_CONNECTIONS(3) CURLMOPT_MAX_PIPELINE_LENGTH deprecated. See CURLMOPT_MAX_PIPELINE_LENGTH(3) CURLMOPT_MAX_TOTAL_CONNECTIONS Max simultaneously open connections. See CURLMOPT_MAX_TOTAL_CONNEC- TIONS(3) CURLMOPT_NETWORK_CHANGED Signal that the network has changed. See CURLMOPT_NETWORK_CHANGED(3) CURLMOPT_NOTIFYDATA Custom pointer passed to the notify callback. See CURLMOPT_NOTIFY- DATA(3) CURLMOPT_NOTIFYFUNCTION Callback that receives notifications. See CURLMOPT_NOTIFYFUNCTION(3) CURLMOPT_PIPELINING Enable HTTP multiplexing. See CURLMOPT_PIPELINING(3) CURLMOPT_PIPELINING_SERVER_BL deprecated. See CURLMOPT_PIPELINING_SERVER_BL(3) CURLMOPT_PIPELINING_SITE_BL deprecated. See CURLMOPT_PIPELINING_SITE_BL(3) CURLMOPT_PUSHDATA Pointer to pass to push callback. See CURLMOPT_PUSHDATA(3) CURLMOPT_PUSHFUNCTION Callback that approves or denies server pushes. See CURLMOPT_PUSH- FUNCTION(3) CURLMOPT_QUICK_EXIT Enable a quicker cleanup of the multi handle. See CURL- MOPT_QUICK_EXIT(3) CURLMOPT_RESOLVE_THREADS_MAX Max threads used for threaded DNS resolver. See CURLMOPT_RE- SOLVE_THREADS_MAX(3) CURLMOPT_SOCKETDATA Custom pointer passed to the socket callback. See CURLMOPT_SOCKET- DATA(3) CURLMOPT_SOCKETFUNCTION Callback informed about what to wait for. See CURLMOPT_SOCKETFUNC- TION(3) CURLMOPT_TIMERDATA Custom pointer to pass to timer callback. See CURLMOPT_TIMERDATA(3) CURLMOPT_TIMERFUNCTION Callback to receive timeout values. See CURLMOPT_TIMERFUNCTION(3) PROTOCOLS This functionality affects all supported protocols EXAMPLE #define MAX_PARALLEL 45 int main(void) { CURLM *multi = curl_multi_init(); /* Limit the amount of simultaneous connections curl should allow: */ curl_multi_setopt(multi, CURLMOPT_MAXCONNECTS, (long)MAX_PARALLEL); } AVAILABILITY Added in curl 7.15.4 RETURN VALUE This function returns a CURLMcode indicating success or error. CURLM_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). Note that it returns a CURLM_UNKNOWN_OPTION if you try setting an option that this version of libcurl does not know of. SEE ALSO curl_multi_cleanup(3), curl_multi_info_read(3), curl_multi_init(3), curl_multi_socket(3) libcurl 2026-06-11 curl_multi_setopt(3)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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