.\" generated by cd2nroff 0.1 from CURLOPT_XFERINFODATA.md
.TH CURLOPT_XFERINFODATA 3 "2024-11-07" libcurl
.SH NAME
CURLOPT_XFERINFODATA \- pointer passed to the progress callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);
.fi
.SH DESCRIPTION
Pass a \fIpointer\fP that is untouched by libcurl and passed as the first
argument in the progress callback set with \fICURLOPT_XFERINFOFUNCTION(3)\fP.

This is an alias for \fICURLOPT_PROGRESSDATA(3)\fP.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.32.0
.SH RETURN VALUE
Returns CURLE_OK
.SH SEE ALSO
.BR CURLOPT_NOPROGRESS (3),
.BR CURLOPT_VERBOSE (3),
.BR CURLOPT_XFERINFOFUNCTION (3)