Re: [PATCH 1/3] New option --cygwin-tty.

[Yao Qi <yao@codesourcery.com>]

On 07/25/2013 04:18 PM, Corinna Vinschen wrote:
>> Yeah, I agree, but I am worried that stdio handlers (such as stdout)
>> >should be set before any writes to them, so we should set the flag
>> >(cygwin_tty) at the early stage of GDB start up (before command 'set
>> >windows-os-tty on' is processed).  If it is not a problem, I am
>> >fine.
> You can use the _setmode() call at any time to switch text/binary mode
> on the descriptors.
>

The doc on _setmode on MSDN says _setmode () should be called before any 
input or output operations.

http://msdn.microsoft.com/en-us/library/tw4k6df8.aspx

"_setmode is typically used to modify the default translation mode of 
stdin and stdout, but you can use it on any file. If you apply _setmode 
to the file descriptor for a stream, call _setmode before you perform 
any input or output operations on the stream."

Beside setmode, we also need setvbuf to disable buffering.  It should be 
called before any input or output on the stream.

>> >I am looking at Corinna's example to see how to detect GDB is
>> >running in Cygwin's TTY.  If it works, probably we can get rid of
>> >this new GDB option completely.
> It has been tested under Mingw-w64 and VC++.  If you're using Mingw.Org,
> it probably needs some tweaking.

Right, it needs some tweaks on headers files for Mingw.Org.

What is the minimum version of cygwin required for this example?  In 
cygwin 1.7.20, the file name is 
"\cygwin-8c26184c318518a4-pty0-from-master", while in 1.7.9, it is 
"\cygwin-c5e39b7a9d22bafb-tty0-from-master".

-- 
Yao (齐尧)