[PATCH] fhandler_tty doecho change

Corinna Vinschen cygwin-patches@cygwin.com
Tue Sep 24 00:21:00 GMT 2002

On Tue, Sep 24, 2002 at 01:50:54AM -0500, Steve O wrote:
> Hi,
> A week or so ago, I found that rxvt hangs could be fixed by making
> the tty pipe non-blocking.  As I look into this more, I discovered
> that fhandler_pty_master::doecho uses the slave's side of the
> pipe to accomplish echoing characters to the terminal.  A clever
> and simple solution, but it causes a deadlock when the slave's 
> write pipe is full.  
> The solution presented in this patch is to use a buffer to store the
> echo characters, similar to the readahead buffer.  I wanted to use
> the readahead buffer, but convinced myself that the data was 
> different enough that folding it in would create more complex code
> than necessary. 
> Fixing this deadlock revealed a deadlock in the 
> fhandler_pty_master::accept_input code which will be the subject of 
> my next patch.

This looks interesting but is actually missing a ChangeLog entry.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

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