curl_multi_socket - reads/writes available data
#include <curl/curl.h> CURLMcode curl_multi_socket(CURLM *multi_handle, curl_socket_t sockfd, int *running_handles); CURLMcode curl_multi_socket_all(CURLM *multi_handle, int *running_handles);
These functions are deprecated. Do not use. See curl_multi_socket_action instead.
At return, the integer running_handles points to will contain the number of still running easy handles within the multi handle. When this number reaches zero, all transfers are complete/done. Note that when you call curl_multi_socket_action on a specific socket and the counter decreases by one, it DOES NOT necessarily mean that this exact socket/transfer is the one that completed. Use curl_multi_info_read to figure out which easy handle that completed.
The curl_multi_socket_action functions inform the application about updates in the socket (file descriptor) status by doing none, one, or multiple calls to the socket callback function set with the CURLMOPT_SOCKETFUNCTION option to curl_multi_setopt. They update the status with changes since the previous time the callback was called.
Get the timeout time by setting the CURLMOPT_TIMERFUNCTION option with curl_multi_setopt. Your application will then get called with information on how long to wait for socket actions at most before doing the timeout action: call the curl_multi_socket_action function with the sockfd argument set to CURL_SOCKET_TIMEOUT. You can also use the curl_multi_timeout function to poll the value at any given time, but for an event-based system using the callback is far better than relying on polling the timeout value.
Force libcurl to (re-)check all its internal sockets and transfers instead of just a single one by calling curl_multi_socket_all. Note that there should not be any reason to use this function.
/* the event-library gets told when there activity on the socket 'fd', which we translate to a call to curl_multi_socket_action() */ int running; rc = curl_multi_socket(multi_handle, fd, &running);
This function was added in libcurl 7.15.4, and is deemed stable since 7.16.0.
CURLMcode type, general libcurl multi interface error code.
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