.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at https://curl.haxx.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" ************************************************************************** .\" .TH CURLOPT_SOCKOPTDATA 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options" .SH NAME CURLOPT_SOCKOPTDATA \- custom pointer to pass to sockopt callback .SH SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer); .SH DESCRIPTION Pass a \fIpointer\fP that will be untouched by libcurl and passed as the first argument in the sockopt callback set with \fICURLOPT_SOCKOPTFUNCTION(3)\fP. .SH DEFAULT The default value of this parameter is NULL. .SH PROTOCOLS All .SH EXAMPLE .nf 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); } .fi .SH AVAILABILITY Added in 7.16.0 .SH RETURN VALUE Returns \fICURLE_OK\fP if the option is supported, and \fICURLE_UNKNOWN_OPTION\fP if not. .SH "SEE ALSO" .BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "