CURLOPT_RESUME_FROM_LARGE(3)

✨ CURLOPT_RESUME_FROM_LARGE 💅

okay so real talk, bestie — this one lives in the Library Functions Manual section of the curl docs, and it's the big-sibling version of the resume option. Let's get into it 🫶

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🌸 NAME 🌸

CURLOPT_RESUME_FROM_LARGE — the offset you wanna resume a transfer from, but make it large 💅

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✨ SYNOPSIS ✨

#include <curl/curl.h>

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

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🦋 DESCRIPTION 🦋

So you pass a curl_off_t as the parameter, and it holds the offset — in number of bytes — of where you want the transfer to start. That's it, that's the vibe ✨

Set this option to 0 and the transfer just starts from the beginning again (which effectively disables resume — like, it's so over). 🎀

For FTP though? Set this option to -1 and the transfer starts from the end of the target file. Super useful for continuing an interrupted upload, iykyk 🔥

And when you're 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. Main character energy, honestly 👑

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💖 DEFAULT 💖

0, not used

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🌈 PROTOCOLS 🌈

This functionality affects all supported protocols — no gatekeeping here, we love an inclusive icon ⭐

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🎀 EXAMPLE 🎀

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_off_t resume_position = 1234; /* get it somehow */
    curl_off_t file_size = 9876; /* 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);
  }
}

like yes, resuming an upload at a position possibly beyond 2GB — that's the whole point of the _LARGE girlies 💀✨

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⭐ AVAILABILITY ⭐

Added in curl 7.11.0 — a classic, honestly, she's been iconic for ages 👑

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🧚 RETURN VALUE 🧚

curl_easy_setopt(3) returns a CURLcode indicating success or error, bestie.

CURLE_OK (0) means everything was OK — green flags only 🟢. Non-zero means an error occurred, and you should go check libcurl-errors(3) to find out what went down 😭

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💜 SEE ALSO 💜

• CURLOPT_INFILESIZE_LARGE(3)
• CURLOPT_RANGE(3)
• CURLOPT_RESUME_FROM(3)

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that's the whole page, no notes 💅 this beauty ships from libcurl, dated 2026-10-12 — mwah, go resume something big 🍓