---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_RESUME_FROM
Section: 3
Source: libcurl
See-also:
  - CURLOPT_INFILESIZE (3)
  - CURLOPT_RANGE (3)
  - CURLOPT_RESUME_FROM_LARGE (3)
Protocol:
  - All
Added-in: 7.1
---

# NAME

CURLOPT_RESUME_FROM - offset to resume transfer from

# SYNOPSIS

~~~c
#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%

# EXAMPLE

~~~c
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%

# 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).
