docs/libcurl/opts/CURLOPT_RESUME_FROM.3

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.TH CURLOPT_RESUME_FROM 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_RESUME_FROM \- set a point to resume transfer from
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from);
.SH DESCRIPTION
Pass a long as parameter. It contains the offset in number of bytes that you
want the transfer to start from. Set this option to 0 to make the transfer
start from the beginning (effectively disabling resume). For FTP, set this
option to -1 to make the transfer start from the end of the target file
(useful to continue an interrupted upload).

When doing uploads with FTP, the resume position is where in the local/source
file libcurl should try to resume the upload from and it will then append the
source file to the remote target file.

If you need to resume a transfer beyond the 2GB limit, use
\fICURLOPT_RESUME_FROM_LARGE(3)\fP instead.
.SH DEFAULT
0, not used
.SH PROTOCOLS
HTTP, FTP, SFTP, FILE
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com");

  /* resume upload at byte index 200 */
  curl_easy_setopt(curl, CURLOPT_RESUME_FROM, 200L);

  /* ask for upload */
  curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

  /* set total data amount to expect */
  curl_easy_setopt(curl, CURLOPT_INFILESIZE, size_of_file);

  /* Perform the request */
  curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
Always
.SH RETURN VALUE
Returns CURLE_OK
.SH "SEE ALSO"
.BR CURLOPT_RESUME_FROM_LARGE "(3), " CURLOPT_RANGE "(3), "
.BR CURLOPT_INFILESIZE "(3), "