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54ded66618
- always assign the curl_easy_perform() return code (and declare the necessary 'result' variable for it) - always call curl_easy_cleanup() on the created easy handles Closes #21364
84 lines
1.9 KiB
Markdown
84 lines
1.9 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_RESUME_FROM
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_INFILESIZE (3)
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- CURLOPT_RANGE (3)
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- CURLOPT_RESUME_FROM_LARGE (3)
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Protocol:
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- All
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Added-in: 7.1
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---
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# NAME
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CURLOPT_RESUME_FROM - offset to resume transfer from
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from);
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~~~
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# DESCRIPTION
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Pass a long as parameter. It contains the offset in number of bytes that you
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want the transfer to start from. Set this option to 0 to make the transfer
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start from the beginning (effectively disabling resume). For FTP, set this
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option to -1 to make the transfer start from the end of the target file
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(useful to continue an interrupted upload).
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When doing uploads with FTP, the resume position is where in the local/source
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file libcurl should try to resume the upload from and it then appends the
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source file to the remote target file.
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If you need to resume a transfer beyond the 2GB limit, use
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CURLOPT_RESUME_FROM_LARGE(3) instead.
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# DEFAULT
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0, not used
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode result;
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long size_of_file = 6789;
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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com");
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/* resume upload at byte index 200 */
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curl_easy_setopt(curl, CURLOPT_RESUME_FROM, 200L);
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/* ask for upload */
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curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
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/* set total data amount to expect */
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curl_easy_setopt(curl, CURLOPT_INFILESIZE, size_of_file);
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/* Perform the request */
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result = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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