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

• CURLOPT_NOPROGRESS (3)
• CURLOPT_VERBOSE (3)
• CURLOPT_XFERINFOFUNCTION (3)

---

NAME

CURLOPT_XFERINFODATA - pointer passed to the progress callback

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);

DESCRIPTION

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

This is an alias for CURLOPT_PROGRESSDATA(3).

DEFAULT

The default value of this parameter is NULL.

PROTOCOLS

All

EXAMPLE

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

static size_t progress_cb(void *clientp,
                          curl_off_t dltotal,
                          curl_off_t dlnow,
                          curl_off_t ultotal,
                          curl_off_t ulnow)
{
  struct progress *memory = clientp;
  printf("private ptr: %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_XFERINFODATA, &data);
    curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, progress_cb);
  }
}

AVAILABILITY

Added in 7.32.0

RETURN VALUE

Returns CURLE_OK