CURLOPT_RESUME_FROM(3) Library Functions Manual CURLOPT_RESUME_FROM(3)
NAME
CURLOPT_RESUME_FROM - offset to resume transfer from
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from);
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
then appends the source file to the remote target file.
HTTP uploads using POST or PUT cannot be resumed. curl_easy_perform(3)
returns CURLE_BAD_FUNCTION_ARGUMENT when this option is set to a non-zero
value for such an upload.
If you need to resume a transfer beyond the 2GB limit, use
CURLOPT_RESUME_FROM_LARGE(3) instead.
DEFAULT
0, not used
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
long size_of_file = 6789;
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 */
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.1
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_INFILESIZE(3), CURLOPT_RANGE(3), CURLOPT_RESUME_FROM_LARGE(3)
libcurl 2026-10-18 CURLOPT_RESUME_FROM(3)
curl 8.23.0 - Generated Sun Oct 18 18:17:52 CDT 2026