CURLMOPT_SOCKETDATA explained

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 CURLMOPT_SOCKETFUNCTION option.

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