---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_PROGRESSDATA
Section: 3
Source: libcurl
See-also:
  - CURLOPT_PROGRESSFUNCTION (3)
  - CURLOPT_XFERINFOFUNCTION (3)
---

# NAME

CURLOPT_PROGRESSDATA - pointer passed to the progress callback

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSDATA, void *pointer);
~~~

# DESCRIPTION

Pass a *pointer* that is untouched by libcurl and passed as the first
argument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3).

# DEFAULT

The default value of this parameter is NULL.

# PROTOCOLS

All

# EXAMPLE

~~~c
struct progress {
  char *private;
  size_t size;
};

static size_t progress_callback(void *clientp,
                                double dltotal,
                                double dlnow,
                                double ultotal,
                                double ulnow)
{
  struct progress *memory = clientp;
  printf("private: %p\n", memory->private);

  /* use the values */

  return 0; /* all is good */
}

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    struct progress data;

    /* pass struct to callback  */
    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &data);
    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);

    curl_easy_perform(curl);
  }
}
~~~

# AVAILABILITY

Always

# RETURN VALUE

Returns CURLE_OK