GNURLMOPT_PUSHDATA(3)

💅 NAME 💅

CURLMOPT_PUSHDATA — the pointer you pass along to the push callback, bestie. This whole thing is the GNURLMOPT_PUSHDATA(3) manual page, and it's lowkey just about handing a pointer to your callback. ✨

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🦋 SYNOPSIS 🦋

#include <gnurl/curl.h>

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

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🌸 DESCRIPTION 🌸

Okay so you set that pointer to be passed as the last argument to the CURLMOPT_PUSHFUNCTION(3) callback. That's it, that's the vibe.

The pointer will not be touched or used by libcurl itself — it only gets passed on to the callback function. No cap. 💖

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🎀 DEFAULT 🎀

NULL — that's the default, periodt. 💅

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🌈 PROTOCOLS 🌈

HTTP(S) only, bestie. 🦋

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✨ EXAMPLE ✨

This one only allows pushes for file names starting with "push-":

/* 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);

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🫶 AVAILABILITY 🫶

Added in 7.44.0 — iconic behavior since day one of that release. ⭐

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💜 RETURN VALUE 💜

Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not. Simple as that. 🍓

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👑 SEE ALSO 👑

CURLMOPT_PUSHFUNCTION(3), CURLMOPT_PIPELINING(3), CURLOPT_PIPEWAIT(3), RFC7540

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mwah 💖 this little page is from libcurl 7.44.0, dated 1 Jun 2015 — GNURLMOPT_PUSHDATA(3) out! 🫶✨