CURLOPT_TFTP_BLKSIZE(3) Introduction to Library Functions

NAME

CURLOPT_TFTP_BLKSIZE - TFTP block size

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TFTP_BLKSIZE, long blocksize);

DESCRIPTION

Specify blocksize to use for TFTP data transmission. Valid range as
per RFC 2348 is 8-65464 bytes. The default of 512 bytes is used if
this option is not specified. The specified block size is only used
if supported by the remote server. If the server does not return an
option acknowledgment or returns an option acknowledgment with no
block size, the default of 512 bytes is used.

DEFAULT

512

PROTOCOLS

This functionality affects tftp only

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "tftp://example.com/bootimage");
/* try using larger blocks */
curl_easy_setopt(curl, CURLOPT_TFTP_BLKSIZE, 2048L);
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.19.4

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).

SEE ALSO

CURLOPT_MAXFILESIZE(3)

libcurl 2026-01-08 CURLOPT_TFTP_BLKSIZE(3)