curl/docs/libcurl/opts/CURLINFO_ACTIVESOCKET.md
Daniel Gustafsson 8d67c61c47 curldown: Fix email address in Copyright
The curldown conversion accidentally replaced daniel@haxx.se with
just daniel.se.  This reverts back to the proper email address in
the curldown docs as well as in a few other stray places where it
was incorrect (while unrelated to curldown).

Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Closes: #12997
2024-02-28 11:28:10 +01:00

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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLINFO_ACTIVESOCKET
Section: 3
Source: libcurl
See-also:
- CURLINFO_LASTSOCKET (3)
- CURLOPT_CONNECT_ONLY (3)
- curl_easy_getinfo (3)
- curl_easy_setopt (3)
---
# NAME
CURLINFO_ACTIVESOCKET - get the active socket
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_ACTIVESOCKET,
curl_socket_t *socket);
~~~
# DESCRIPTION
Pass a pointer to a curl_socket_t to receive the most recently active socket
used for the transfer connection by this curl session. If the socket is no
longer valid, *CURL_SOCKET_BAD* is returned. When you are finished working
with the socket, you must call curl_easy_cleanup(3) as usual on the easy
handle and let libcurl close the socket and cleanup other resources associated
with the handle. This option returns the active socket only after the transfer
is complete, and is typically used in combination with
CURLOPT_CONNECT_ONLY(3), which skips the transfer phase.
CURLINFO_ACTIVESOCKET(3) was added as a replacement for
CURLINFO_LASTSOCKET(3) since that one is not working on all platforms.
# PROTOCOLS
All
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_socket_t sockfd;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* Do not do the transfer - only connect to host */
curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
res = curl_easy_perform(curl);
/* Extract the socket from the curl handle */
res = curl_easy_getinfo(curl, CURLINFO_ACTIVESOCKET, &sockfd);
if(res != CURLE_OK) {
printf("Error: %s\n", curl_easy_strerror(res));
return 1;
}
}
}
~~~
# AVAILABILITY
Added in 7.45.0
# RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.