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CURLOPT_CLOSESOCKETFUNCTION(3)

CURLOPT_C...ETFUNCTION(3)  curl_easy_setopt options  CURLOPT_C...ETFUNCTION(3)

NAME
       CURLOPT_CLOSESOCKETFUNCTION - callback to socket close replacement

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 proto‐
       type 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 CURLOPT_OPENSOCK‐
       ETFUNCTION(3) option. Return 0 to signal success and 1 if there was  an
       error.

       The clientp pointer is set with 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 7.86.0                   May 17, 2022        CURLOPT_C...ETFUNCTION(3)
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