---
name: "CURLOPT_INFILESIZE"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_INFILESIZE"
---

# CURLOPT\_INFILESIZE(3)

size of the input file to send off

## NAME

CURLOPT\_INFILESIZE - size of the input file to send off

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INFILESIZE, long filesize);
```

## DESCRIPTION

When uploading a file to a remote site, *filesize* should be used to tell libcurl what the expected size of the input file is. This value must be passed as a long. See also *[CURLOPT\_INFILESIZE\_LARGE(3)](/CURLOPT_INFILESIZE_LARGE/3.md)* for sending files larger than 2GB.

For uploading using SCP, this option or *[CURLOPT\_INFILESIZE\_LARGE(3)](/CURLOPT_INFILESIZE_LARGE/3.md)* is mandatory.

To unset this value again, set it to -1.

Using *[CURLOPT\_UPLOAD(3)](/CURLOPT_UPLOAD/3.md)* to an HTTP/1.1 server and this value set to -1, makes libcurl do a chunked transfer-encoded upload.

When sending emails using SMTP, this command can be used to specify the optional SIZE parameter for the MAIL FROM command.

This option does not limit how much data libcurl actually sends, as that is controlled entirely by what the read callback returns, but telling one value and sending a different amount may lead to errors.

## DEFAULT

Unset

## PROTOCOLS

Many

## EXAMPLE

```
#define FILE_SIZE 12345L
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    long uploadsize = FILE_SIZE;
    curl_easy_setopt(curl, CURLOPT_URL,
                     "ftp://example.com/destination.tar.gz");
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
    curl_easy_setopt(curl, CURLOPT_INFILESIZE, uploadsize);
    curl_easy_perform(curl);
  }
}
```

## AVAILABILITY

SMTP support added in 7.23.0

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLINFO\_CONTENT\_LENGTH\_UPLOAD\_T**(3)](/CURLINFO_CONTENT_LENGTH_UPLOAD_T/3.md), [**CURLOPT\_INFILESIZE\_LARGE**(3)](/CURLOPT_INFILESIZE_LARGE/3.md), [**CURLOPT\_UPLOAD**(3)](/CURLOPT_UPLOAD/3.md)