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CURLOPT_SOCKOPTDATA(3)     curl_easy_setopt options     CURLOPT_SOCKOPTDATA(3)

NAME

CURLOPT_SOCKOPTDATA - custom 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 will be untouched by libcurl and passed as the first argument in the sockopt callback set with CURLOPT_SOCKOPTFUNCTION(3).

DEFAULT

The default value of this parameter is NULL.

PROTOCOLS

All

EXAMPLE

static int sockopt_callback(void *clientp, curl_socket_t curlfd, curlsocktype purpose) { int val = *(int *)clientp; setsockopt(curldfd, SOL_SOCKET, SO_RCVBUF, (const char *)&val, sizeof(val)); return CURL_SOCKOPT_OK; } curl = curl_easy_init(); if(curl) { int recvbuffersize = 256 * 1024; curl_easy_setopt(curl, CURLOPT_URL, "http://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); res = curl_easy_perform(curl); curl_easy_cleanup(curl); }

AVAILABILITY

Added in 7.16.0

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_OPENSOCKETFUNCTION(3), libcurl 7.65.3 May 15, 2017 CURLOPT_SOCKOPTDATA(3)

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