pty issue causes 'screen' to hang when run from mintty as detached

Fri Jun 14 03:08:00 GMT 2013

On 6/13/2013 7:39 PM, gmt@malth.us wrote:
> On 2013年6月13日, at 14:07, Larry Hall (Cygwin) thusly quipped:
>>> On 6/13/2013 3:34 PM, Greg Turner wrote:
>>> On Wed, Jun 12, 2013 at 3:19 PM, Matt D. <matt@codespunk.com> wrote:
>>>> "the Windows console window you get through cygstart is not [a pty]"
>>>>>> Ah, so /that's/ what I recently read uncomprehendingly! Thanks for
>>> tracking down this concise explanation. Assuming that's right, then,
>>> I wonder: what is it?
>>>> What is what? This Windows console? It's... well, it's a... um, it's a
> Windows
>> console! ;-)
>>>> But seriously, it's just something different that doesn't conform to the
>> definition of a PTY. Windows doesn't have PTYs. It uses the console
> instead.
>> So, no win32-console-specific fhandler exists, and clones of the win32 stdio
> handles are simply passed through cygwin core to newlib and vice-versa
> without any funny-business?

I don't really grok what you mean by "funny-business" But let me say
this. Cygwin knows how to communicate with Windows consoles. The code
is in fhandler_console.cc if you want to look at it. But there is a
mismatch in capabilities and expectations between ptys and the Windows
console API. That's why there is also fhandler_tty.cc. The former does
its best to match the Linux/Unix world's expectations to what the Windows
console can provide (which is pretty limited). The latter simply sidesteps
the console and provides better pty support.
-- 
Larry
_____________________________________________________________________
A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?
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