1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_RESUME_FROM 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_INFILESIZE (3) 9 - CURLOPT_RANGE (3) 10 - CURLOPT_RESUME_FROM_LARGE (3) 11Protocol: 12 - All 13--- 14 15# NAME 16 17CURLOPT_RESUME_FROM - offset to resume transfer from 18 19# SYNOPSIS 20 21~~~c 22#include <curl/curl.h> 23 24CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from); 25~~~ 26 27# DESCRIPTION 28 29Pass a long as parameter. It contains the offset in number of bytes that you 30want the transfer to start from. Set this option to 0 to make the transfer 31start from the beginning (effectively disabling resume). For FTP, set this 32option to -1 to make the transfer start from the end of the target file 33(useful to continue an interrupted upload). 34 35When doing uploads with FTP, the resume position is where in the local/source 36file libcurl should try to resume the upload from and it then appends the 37source file to the remote target file. 38 39If you need to resume a transfer beyond the 2GB limit, use 40CURLOPT_RESUME_FROM_LARGE(3) instead. 41 42# DEFAULT 43 440, not used 45 46# EXAMPLE 47 48~~~c 49int main(void) 50{ 51 CURL *curl = curl_easy_init(); 52 if(curl) { 53 long size_of_file; 54 55 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com"); 56 57 /* resume upload at byte index 200 */ 58 curl_easy_setopt(curl, CURLOPT_RESUME_FROM, 200L); 59 60 /* ask for upload */ 61 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L); 62 63 /* set total data amount to expect */ 64 curl_easy_setopt(curl, CURLOPT_INFILESIZE, size_of_file); 65 66 /* Perform the request */ 67 curl_easy_perform(curl); 68 } 69} 70~~~ 71 72# AVAILABILITY 73 74Always 75 76# RETURN VALUE 77 78Returns CURLE_OK 79