NAME

       CURLMOPT_SOCKETFUNCTION - callback informed about what to wait for

SYNOPSIS

       #include <curl/curl.h>

       int socket_callback(CURL *easy,      /* easy handle */
                           curl_socket_t s, /* socket */
                           int what,        /* see above */
                           void *userp,     /* private callback pointer */
                           void *socketp);  /* private socket pointer */

       CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);

DESCRIPTION

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

       When  the  curl_multi_socket_action(3)  function  runs,  it  informs the application about
       updates in the socket (file descriptor) status by doing none, one, or  multiple  calls  to
       the socket_callback. The callback gets status updates with changes since the previous time
       the callback was called.  If the given callback pointer  is  NULL,  no  callback  will  be
       called.   Set   the   callback's   userp   argument   with   CURLMOPT_SOCKETDATA(3).   See
       curl_multi_socket_action(3) for more details on how the callback is used and should work.

DEFAULT

       NULL (no callback)

PROTOCOLS

       All

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.15.4

RETURN VALUE

       Returns CURLM_OK.

SEE ALSO

       CURLMOPT_SOCKETDATA(3), curl_multi_socket_action(3), CURLMOPT_TIMERFUNCTION(3)