curl_multi_setopt - set options for a curl multi handle
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 is used to tell a libcurl multi handle how to behave. By using the appropriate options to curl_multi_setopt, 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 function 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
CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE
deprecated See CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE
Size of connection cache. See CURLMOPT_MAXCONNECTS
CURLMOPT_MAX_CONCURRENT_STREAMS
Max concurrent streams for http2. See CURLMOPT_MAX_CONCURRENT_STREAMS
Max number of connections to a single host. See CURLMOPT_MAX_HOST_CONNECTIONS
deprecated. See CURLMOPT_MAX_PIPELINE_LENGTH
CURLMOPT_MAX_TOTAL_CONNECTIONS
Max simultaneously open connections. See CURLMOPT_MAX_TOTAL_CONNECTIONS
Enable HTTP multiplexing. See CURLMOPT_PIPELINING
deprecated. See CURLMOPT_PIPELINING_SERVER_BL
deprecated. See CURLMOPT_PIPELINING_SITE_BL
Pointer to pass to push callback. See CURLMOPT_PUSHDATA
Callback that approves or denies server pushes. See CURLMOPT_PUSHFUNCTION
Custom pointer passed to the socket callback. See CURLMOPT_SOCKETDATA
Callback informed about what to wait for. See CURLMOPT_SOCKETFUNCTION
Custom pointer to pass to timer callback. See CURLMOPT_TIMERDATA
Callback to receive timeout values. See CURLMOPT_TIMERFUNCTION
Protocols
This functionality affects all supported protocols
Example
#define MAX_PARALLEL 45
int main(void)
{
CURLM *multi;
/* 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
The standard CURLMcode for multi interface error codes. 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)
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