---
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)
Protocol:
  - All
Added-in: 7.1
---

# 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

NULL

# %PROTOCOLS%

# EXAMPLE

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

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

  /* use the values */

  return 0; /* all is good */
}

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

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

    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
~~~

# %AVAILABILITY%

# RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
libcurl-errors(3).
