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Path: /proc/self/root/opt/alt/curlssl30/usr/share/man/man3/

Viewing File: CURLOPT_SEEKDATA.3

.\" generated by cd2nroff 0.1 from CURLOPT_SEEKDATA.md
.TH CURLOPT_SEEKDATA 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_SEEKDATA \- pointer passed to the seek callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SEEKDATA, void *pointer);
.fi
.SH DESCRIPTION
Data \fIpointer\fP to pass to the seek callback function. If you use the
\fICURLOPT_SEEKFUNCTION(3)\fP option, this is the pointer you get as input.
.SH DEFAULT
If you do not set this, NULL is passed to the callback.
.SH PROTOCOLS
This functionality affects ftp, http and sftp
.SH EXAMPLE
.nf
#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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.18.0
.SH RETURN VALUE
.SH SEE ALSO
.BR CURLOPT_DEBUGFUNCTION (3),
.BR CURLOPT_IOCTLFUNCTION (3),
.BR CURLOPT_SEEKFUNCTION (3),
.BR CURLOPT_STDERR (3)
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