TIP#287 IMPLEMENTATION

        * doc/chan.n:           New subcommand [chan pending].
        * generic/tclBasic.c:   Thanks to Michael Cleverly for proposal
        * generic/tclInt.h:     and implementation.
        * generic/tclIOCmd.c:
        * library/init.tcl:
        * tests/chan.test:
        * tests/ioCmd.test:

1 files changed, 11 insertions, 1 deletions

diff --git a/doc/chan.n b/doc/chan.n
index 6b912c1..9e51251 100644
--- a/doc/chan.n
+++ b/doc/chan.n
@@ -4,7 +4,7 @@
 '\" See the file "license.terms" for information on usage and redistribution
 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 '\"
-'\" RCS: @(#) $Id: chan.n,v 1.6 2006/11/16 09:34:17 dkf Exp $
+'\" RCS: @(#) $Id: chan.n,v 1.7 2006/12/01 15:55:44 dgp Exp $
 .so man.macros
 .TH chan n 8.5 Tcl "Tcl Built-In Commands"
 .BS
@@ -493,6 +493,16 @@ Produces a list of all channel names. If \fIpattern\fR is specified,
 only those channel names that match it (according to the rules of
 \fBstring match\fR) will be returned.
 .TP
+\fBchan pending \fImode channelId\fR
+.
+Depending on whether \fImode\fr is "input" or "output", returns the number of 
+bytes of input or output (respectively) currently buffered 
+internally for \fIchannelId\fr (especially useful in a readable event 
+callback to impose application-specific limits on input line lengths to avoid
+a potential denial-of-service attack where a hostile user crafts
+an extremely long line that exceeds the available memory to buffer it).
+Returns -1 if the channel was not opened for the mode in question.
+.TP
 \fBchan postevent \fIchannelId eventSpec\fR
 .
 This subcommand is used by command handlers specified with \fBchan