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 lo-
cal/source file libcurl should try to resume the upload from and it then
appends the source file to the remote target file.
If you need to resume a transfer beyond the 2GB limit, use CURLOPT_RE-
SUME_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) {
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 */
curl_easy_perform(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 2026-07-12 CURLOPT_RESUME_FROM(3)
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