CURLMOPT_SOCKETDATA(3)     curl_multi_setopt options    CURLMOPT_SOCKETDATA(3)

NAME
       CURLMOPT_SOCKETDATA - custom pointer passed to the socket callback

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETDATA, void *pointer);

DESCRIPTION
       A data pointer to pass to the socket callback set with the
       _SOCKETFUNCTION&section=3">CURLMOPT_SOCKETFUNCTION(3) option.

       This pointer will not be touched by libcurl but will only be passed in
       to the socket callbacks's userp argument.

DEFAULT
       NULL

PROTOCOLS
       All

EXAMPLE
       static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
       {
         GlobalInfo *g = (GlobalInfo*) cbp;
         SockInfo *fdp = (SockInfo*) sockp;

         if(what == CURL_POLL_REMOVE) {
           remsock(fdp);
         }
         else {
           if(!fdp) {
             addsock(s, e, what, g);
           }
           else {
             setsock(fdp, s, e, what, g);
           }
         }
         return 0;
       }

       main()
       {
         GlobalInfo setup;
         /* ... use socket callback and custom pointer */
         curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
         curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
       }

AVAILABILITY
       Added in 7.15.4

RETURN VALUE
       Returns CURLM_OK.

SEE ALSO
       CURLMOPT_SOCKETFUNCTION(3), curl_multi_socket_action(3),
       CURLMOPT_TIMERFUNCTION(3)

libcurl 7.77.0                 November 4, 2020         CURLMOPT_SOCKETDATA(3)