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