CURLOPT_TFTP_BLKSIZE(3)    Library Functions Manual    CURLOPT_TFTP_BLKSIZE(3)

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                           2026-05-13           CURLOPT_TFTP_BLKSIZE(3)