TIP: 344 Title: Bring TCP_NODELAY and SO_KEEPALIVE to socket options Version: $Revision: 1.2 $ Author: Alexandre Ferrieux State: Draft Type: Project Vote: Pending Created: 31-Dec-2008 Post-History: Tcl-Version: 8.7 ~ Abstract Just expose to script level, via '''fconfigure''', the two most important setsockopt() use cases: TCP_NODELAY (disabling the Nagle agorithm) and SO_KEEPALIVE (sending automatic keepalives). ~ Background & Rationale Currently, there is no way to set nodefault values to a Tcl socket's underlying socket options TCP_NODELAY and SO_KEEPALIVE. That is frustrating because all TCP stacks support setsockopt(). Of these two options, the most important I guess is TCP_NODELAY. Indeed, the Nagle algorithm being on by default may introduce unwanted latencies in some specific cases. This TIP does not try to argument about the prevalence of these cases; the ubiquity of setsockopt(TCP_NODELAY) suffices to justify exposing it to script level. ~ Proposed Change This TIP proposes to add two boolean [fconfigure] options to sockets: '''-nodelay''' (or '''-nonagle''', or '''-nagle''', take your pick) and '''-keepalive'''. ~ Reference Implementation Pretty trivial; will be provided shortly after validation. The code has even been in place for a long time, though only in the Windows-specific part, and commented/ifdef'ed out... ~ Copyright This document has been placed in the public domain.