curl / libcurl / API / curl_easy_setopt / CURLOPT_SEEKDATA

CURLOPT_SEEKDATA explained

Name

CURLOPT_SEEKDATA - pointer passed to the seek callback

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SEEKDATA, void *pointer);

Description

Data pointer to pass to the seek callback function. If you use the CURLOPT_SEEKFUNCTION option, this is the pointer you get as input.

Default

If you do not set this, NULL is passed to the callback.

Protocols

HTTP, FTP, SFTP

Example

#include <unistd.h> /* for lseek() */
 
struct data {
  int our_fd;
};
 
static int seek_cb(void *clientp, curl_off_t offset, int origin)
{
  struct data *d = (struct data *)clientp;
  lseek(d->our_fd, offset, origin);
  return CURL_SEEKFUNC_OK;
}
 
int main(void)
{
  struct data seek_data;
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION, seek_cb);
    curl_easy_setopt(curl, CURLOPT_SEEKDATA, &seek_data);
  }
}

Availability

Added in 7.18.0