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 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 CURLOPT_OPENSOCKETFUNCTION(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.

Note that when using multi/share handles, your callback may get invoked even after the easy handle has been cleaned up. The callback and data is inherited by a new connection and that connection may live longer than the transfer itself in the multi/share handle's connection cache.

DEFAULT¶

Use the standard socket close function.

PROTOCOLS¶

This functionality affects all supported protocols

EXAMPLE¶

struct priv {


  void *custom;
};
static int closesocket(void *clientp, curl_socket_t item)
{


  struct priv *my = clientp;


  printf("our ptr: %p\n", my->custom);


  printf("libcurl wants to close %d now\n", (int)item);


  return 0;
}
int main(void)
{


  struct priv myown;


  CURL *curl = curl_easy_init();


  /* call this function to close sockets */


  curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket);


  curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &myown);


  curl_easy_perform(curl);


  curl_easy_cleanup(curl);
}

AVAILABILITY¶

Added in curl 7.21.7

RETURN VALUE¶

curl_easy_setopt(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).

SEE ALSO¶

CURLOPT_CLOSESOCKETDATA(3), CURLOPT_OPENSOCKETFUNCTION(3)