93 lines
2.1 KiB
Markdown
93 lines
2.1 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_OPENSOCKETDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_CLOSESOCKETFUNCTION (3)
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- CURLOPT_OPENSOCKETFUNCTION (3)
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- CURLOPT_SOCKOPTFUNCTION (3)
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---
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# NAME
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CURLOPT_OPENSOCKETDATA - pointer passed to open socket callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_OPENSOCKETDATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* that is untouched by libcurl and passed as the first
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argument in the open socket callback set with
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CURLOPT_OPENSOCKETFUNCTION(3).
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# DEFAULT
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The default value of this parameter is NULL.
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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/* make libcurl use the already established socket 'sockfd' */
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static curl_socket_t opensocket(void *clientp,
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curlsocktype purpose,
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struct curl_sockaddr *address)
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{
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curl_socket_t sockfd;
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sockfd = *(curl_socket_t *)clientp;
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/* the actual externally set socket is passed in via the OPENSOCKETDATA
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option */
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return sockfd;
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}
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static int sockopt_callback(void *clientp, curl_socket_t curlfd,
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curlsocktype purpose)
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{
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/* This return code was added in libcurl 7.21.5 */
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return CURL_SOCKOPT_ALREADY_CONNECTED;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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extern int sockfd; /* the already connected one */
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/* libcurl thinks that you connect to the host
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* and port that you specify in the URL option. */
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curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
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/* call this function to get a socket */
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curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
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curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
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/* call this function to set options for the socket */
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curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.17.1
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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