curl_multi_select Wait for activity on any curl_multi connection &reftitle.description; intcurl_multi_select resourcemh floattimeout1.0 Blocks until there is activity on any of the curl_multi connections. &reftitle.parameters; &curl.mh.description; timeout Time, in seconds, to wait for a response. &reftitle.returnvalues; On success, returns the number of descriptors contained in the descriptor sets. On failure, this function will return -1 on a select failure or timeout (from the underlying select system call). &reftitle.seealso; curl_multi_init