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CURLOPT_SOCKOPTDATA(3) Library Functions Manual CURLOPT_SOCKOPTDATA(3) NAME CURLOPT_SOCKOPTDATA - pointer to pass to sockopt callback SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer); DESCRIPTION Pass a pointer that is untouched by libcurl and passed as the first argu- ment in the sockopt callback set with CURLOPT_SOCKOPTFUNCTION(3). DEFAULT NULL PROTOCOLS This functionality affects all supported protocols EXAMPLE static int sockopt_callback(void *clientp, curl_socket_t curlfd, curlsocktype purpose) { int val = *(int *)clientp; setsockopt((int)curlfd, SOL_SOCKET, SO_RCVBUF, (const char *)&val, sizeof(val)); return CURL_SOCKOPT_OK; } int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; int recvbuffersize = 256 * 1024; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); /* call this function to set options for the socket */ curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback); curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &recvbuffersize); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.16.0 RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO CURLOPT_OPENSOCKETFUNCTION(3), CURLOPT_SOCKOPTFUNCTION(3) libcurl 2026-06-11 CURLOPT_SOCKOPTDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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