GNURLINFO_LASTSOCKET(3)

💅 GNURLINFO_LASTSOCKET(3) — curl_easy_getinfo options 💅

Okay bestie, gather round: this one is all about grabbing the last socket your curl session used. It’s giving legacy API energy, but we’re gonna get through it together, no cap.

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🌸 NAME 🌸

CURLINFO_LASTSOCKET — get the last socket used. Literally the “last socket standing” info request, and yes, it has lore.

✨ SYNOPSIS ✨

#include <gnurl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);

🦋 DESCRIPTION 🦋

Deprecated since 7.45.0. Use CURLINFO_ACTIVESOCKET(3) instead.

Bestie, this is the old way. Pass a pointer to a long to receive the last socket used by this curl session. If the socket is no longer valid, -1 is returned. When you finish working with the socket, you must call curl_easy_cleanup() as usual and let libcurl close the socket and cleanup other resources associated with the handle. This is typically used in combination with CURLOPT_CONNECT_ONLY(3).

NOTE: this API is deprecated since it is not working on win64 where the SOCKET type is 64 bits large while its 'long' is 32 bits. Use the CURLINFO_ACTIVESOCKET(3) instead, if possible. 🫶

💖 PROTOCOLS 💖

All. Every single one, bestie. Slay.

🎀 EXAMPLE 🎀

CURL *curl = curl_easy_init();
if(curl) {
  long sockfd; /* doesn't work on win64! */
  curl_easy_setopt(curl, CURLOPT_URL, "http://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_LASTSOCKET, &sockfd);

  if(res != CURLE_OK) {
    printf("Error: %s\n", curl_easy_strerror(res));
    return 1;
  }
}

🌈 AVAILABILITY 🌈

Added in 7.15.2. A lil’ vintage, but still in the docs, bestie.

🔥 RETURN VALUE 🔥

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

👑 SEE ALSO 👑

• curl_easy_getinfo(3)
• curl_easy_setopt(3)
• CURLINFO_ACTIVESOCKET(3)

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🫶 cute sign-off: this page is from libcurl 7.44.0, dated 12 Sep 2015. Bye bestie, go use CURLINFO_ACTIVESOCKET(3) 💖