CURLOPT_READDATA - Man Page

#include <curl/curl.h>

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

Data pointer to pass to the file read function. If you use the CURLOPT_READFUNCTION(3) option, this is the pointer you will get as input in the fourth argument to the callback.

If you do not specify a read callback but instead rely on the default internal read function, this data must be a valid readable FILE * (cast to 'void *').

If you are using libcurl as a win32 DLL, you MUST use a CURLOPT_READFUNCTION(3) if you set this option or you will experience crashes.

By default, this is a FILE * to stdin.

This is used for all protocols when sending data.

CURL *curl = curl_easy_init();
struct MyData this;
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

  /* pass pointer that gets passed in to the
     CURLOPT_READFUNCTION callback */
  curl_easy_setopt(curl, CURLOPT_READDATA, &this);

  curl_easy_perform(curl);
}

This option was once known by the older name CURLOPT_INFILE, the name CURLOPT_READDATA(3) was introduced in 7.9.7.

This will return CURLE_OK.

CURLOPT_READFUNCTION(3), CURLOPT_WRITEDATA(3),

curl_easy_setopt(3), CURLOPT_POST(3), CURLOPT_PUT(3), CURLOPT_READFUNCTION(3), CURLOPT_RTSP_REQUEST(3), CURLOPT_UPLOAD(3), CURLOPT_WRITEDATA(3).