Manpages - CURLMOPT_PUSHDATA.3

CURLMOPT_PUSHDATA - pointer to pass to push callback

  #include <curl/curl.h>

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

Set pointer to pass as the last argument to the CURLMOPT_PUSHFUNCTION(3) callback. The pointer will not be touched or used by libcurl itself, only passed on to the callback function.

NULL

HTTP(S)

  /* only allow pushes for file names starting with "push-" */
  int push_callback(CURL *parent,
                    CURL *easy,
                    size_t num_headers,
                    struct curl_pushheaders *headers,
                    void *userp)
  {
    char *headp;
    int *transfers = (int *)userp;
    FILE *out;
    headp = curl_pushheader_byname(headers, ":path");
    if(headp && !strncmp(headp, "/push-", 6)) {
      fprintf(stderr, "The PATH is %s\n", headp);

      /* save the push here */
      out = fopen("pushed-stream", "wb");

      /* write to this file */
      curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);

      (*transfers)++; /* one more */

      return CURL_PUSH_OK;
    }
    return CURL_PUSH_DENY;
  }

  curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_callback);
  curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);

Added in 7.44.0

Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.

*CURLMOPT_PUSHFUNCTION*(3), *CURLMOPT_PIPELINING*(3), *CURLOPT_PIPEWAIT*(3), *RFC*7540