Man page - curlinfo_lastsocket(3)

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Manual

CURLINFO_LASTSOCKET(3)

Library Functions Manual

CURLINFO_LASTSOCKET(3)

NAME

CURLINFO_LASTSOCKET - get the last socket used

SYNOPSIS

#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);

DESCRIPTION

Deprecated since 7.45.0. Use CURLINFO_ACTIVESOCKET(3) instead.

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 If the socket is no longer valid, -1 is returned.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(3) 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

This functionality affects all supported protocols

EXAMPLE

int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode res;


    long sockfd; /* does not work on win64 */


    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);


    if(res != CURLE_OK) {


      printf("Error: %s\n", curl_easy_strerror(res));


      curl_easy_cleanup(curl);


      return 1;


    }


    /* Extract the socket from the curl handle */


    res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);


    if(!res && sockfd != -1) {


      /* operate on sockfd */


    }


    curl_easy_cleanup(curl);


  }
}

AVAILABILITY

Added in curl 7.15.2

RETURN VALUE

curl_easy_getinfo(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).