Tribblix: manual page: CURLOPT_RESUME_FROM

CURLOPT_RESUME_FROM_LARGE(3) Introduction to Library Functions

NAME

CURLOPT_RESUME_FROM_LARGE - offset to resume transfer from

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM_LARGE,
curl_off_t from);

DESCRIPTION

Pass a curl_off_t 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
appends the source file to the remote target file.

DEFAULT

0, not used

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_off_t resume_position; /* get it somehow */
curl_off_t file_size; /* get it somehow as well */

curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com");

/* resuming upload at this position, possibly beyond 2GB */
curl_easy_setopt(curl, CURLOPT_RESUME_FROM_LARGE, resume_position);

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

/* set total data amount to expect */
curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, file_size);

/* Perform the request */
curl_easy_perform(curl);
}
}

AVAILABILITY

Added in curl 7.11.0

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).