curlopt_resume_from(3)

CURLOPT_RESUME_FROM – set a point 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 will then append 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.

Default

0, not used

Protocols

HTTP, FTP, SFTP, FILE

Example

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);
}

Availability

Always

Return Value

Returns CURLE_OK