Manpages - CURLMOPT_SOCKETDATA.3

CURLMOPT_SOCKETDATA - custom pointer passed to the socket callback

  #include <curl/curl.h>

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

A data pointer to pass to the socket callback set with the 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.

NULL

All

  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);
  }

Added in 7.15.4

Returns CURLM_OK.

*CURLMOPT_SOCKETFUNCTION*(3), *curl_multi_socket_action*(3), *CURLMOPT_TIMERFUNCTION*(3)