This fix works for me:

Attachment: curl-1310-fix.diff (475 Bytes; text/x-patch)

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** [bugs:#1310] TFTP connection takes CURLOPT_TIMEOUT seconds to time out, not CURLOPT_CONNECTTIMEOUT**
**Status:** open-confirmed
**Labels:** TFTP 
**Created:** Tue Dec 03, 2013 08:57 PM UTC by James Dury
**Last Updated:** Wed Dec 04, 2013 10:34 PM UTC
**Owner:** Daniel Stenberg
Problem occurs when using libcurl to attempt to connect to a non-existent TFTP server, with CURLOPT_CONNECTTIMEOUT < CURLOPT_TIMEOUT. 
libcurl version libcurl/7.33.0
CURLOPT_URL=tftp://192.168.0.3/somefile (server doesn't exist)
CURLOPT_CONNECTTIMEOUT=10
CURLOPT_TIMEOUT=20
When calling curl_easy_perform:
* About to connect() to 192.168.0.3 port 69 (#0)
*   Trying 192.168.0.3...
* Adding handle: conn: 0xa02d418
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0xa02d418) send_pipe: 1, recv_pipe: 0
* Connected to 192.168.0.3 (192.168.0.3) port 69 (#0)
* getpeername() failed with errno 107: Transport endpoint is not connected
* set timeouts for state 0; Total 10, retry 3 maxtry 3
< 10 seconds later... >
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* TFTP response timeout
* Operation timed out after 20002 milliseconds with 0 out of 0 bytes received
* Closing connection 0
**curl_easy_perform** returned CURLE_OPERATION_TIMEDOUT after 20 seconds.
What happens after the 10 second timeout is that **tftp_multi_statemach** returns CURLE_OPERATION_TIMEDOUT to **tftp_doing** each time it is called, but **tftp_doing** overwrites the result with the result from **Curl_speedcheck**, which returns OK.
Forcing **tftp_doing** to return the CURLE_OPERATION_TIMEDOUT produces the correct result, which is that **curl_easy_perform** returns CURLE_OPERATION_TIMEDOUT after 10 seconds. I don't know if this is the correct approach.
May be related to http://sourceforge.net/p/curl/bugs/856/ which is a similar bug with FTP.
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