CURLOPT_RESUME_FROM - offset to resume transfer from

Added in curl 7.1

0, not used

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. If you need to resume a transfer beyond the 2GB limit, use CURLOPT_RESUME_FROM_LARGE(3) instead.

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); } }

CURLOPT_RESUME_FROM - offset to resume transfer from

This functionality affects all supported protocols

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).

CURLOPT_INFILESIZE(3), CURLOPT_RANGE(3), CURLOPT_RESUME_FROM_LARGE(3) libcurl 2025-06-16 CURLOPT_RESUME_FROM(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from);