CURLOPT_CLOSESOCKETFUNCTION(3)                        curl_easy_setopt options

NAME
       CURLOPT_CLOSESOCKETFUNCTION - callback to socket close replacement
       function

SYNOPSIS
       #include <curl/curl.h>

       int closesocket_callback(void *clientp, curl_socket_t item);

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETFUNCTION,
       closesocket_callback);

DESCRIPTION
       Pass a pointer to your callback function, which should match the
       prototype shown above.

       This callback function gets called by libcurl instead of the close(3)
       or closesocket(3) call when sockets are closed (not for any other file
       descriptors). This is pretty much the reverse to the
       _OPENSOCKETFUNCTION&section=3">CURLOPT_OPENSOCKETFUNCTION(3) option. Return 0 to signal success and 1
       if there was an error.

       The clientp pointer is set with _CLOSESOCKETDATA&section=3">CURLOPT_CLOSESOCKETDATA(3). item is the
       socket libcurl wants to be closed.

DEFAULT
       By default libcurl uses the standard socket close function.

PROTOCOLS
       All

EXAMPLE
       static int closesocket(void *clientp, curl_socket_t item)
       {
         printf("libcurl wants to close %d now\n", (int)item);
         return 0;
       }

       /* call this function to close sockets */
       curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket);
       curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &sockfd);

AVAILABILITY
       Added in 7.21.7

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

SEE ALSO
       CURLOPT_CLOSESOCKETDATA(3), CURLOPT_OPENSOCKETFUNCTION(3),

libcurl 7.77.0                 November 4, 2020 CURLOPT_CLOSESOCKETFUNCTION(3)