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X-Received: by 10.107.59.17 with SMTP id i17mr32359840ioa.136.1507128116581;        Wed, 04 Oct 2017 07:41:56 -0700 (PDT)
Subject: Re: bash pipe race condition
To: cygwin AT cygwin DOT com
References: <B05F4669-BE32-4C5C-B366-555CE37A6761 AT mcgillis DOT org> <33e9d184-03b1-5fa5-4c1a-0cca19571a3a AT gmail DOT com> <3b4549f8494b5b4062e90eecc1dfc356 AT mail DOT kylheku DOT com>
Reply-To: cygwin AT cygwin DOT com
From: cyg Simple <cygsimple AT gmail DOT com>
Message-ID: <8913ebd6-2d4d-a438-911f-589c8ac05bef@gmail.com>
Date: Wed, 4 Oct 2017 10:41:57 -0400
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On 10/3/2017 11:39 PM, Kaz Kylheku wrote:
> On 03.10.2017 05:56, cyg Simple wrote:
>> On 10/2/2017 9:06 PM, Matthew McGIllis wrote:
>>> If I use the same code from bash I get:
>>>
>>> $ ./input.exe | ./simple.exe
>>> line1
>>> <—— Hangs indefinitely until you kill it or ctrl-c
>>>
>>> Some how if input has a delay between its line output then things
>>> will get hung, if you remove the sleep from the input things work,
>>> add the sleep in it fails.
>>>
>>>
>>> input.exe is generate from input.vb using: vbc input.vb
> [ ... ]
>>
>> It is a known issue of the PTY emulation between a Cygwin runtime and a
>> Windows runtime enabled app.  It just cannot be fixed.  You're even
>> lucky that it works in the Windows command shell.
> 
> Lucky? Are VB console apps known to have unreliable piping when
> used from the Windows command processor?
> 
>> Either convert
>> simple.vb to simple.c and use Cygwin's gcc to build it or create a
>> Windows runtime version of input.exe.
> 
> Isn't that what "input.exe is generate[d] from input.vb using: vbc
> input.vb"
> is referring to?

Oh, yes, sorry I missed that.  Still an issue with PTY and cannot be
fixed regardless without creating a C program of both.  Straight console
on the stdin and stdout channels might work with the C runtime with MS
runtime but should be Cygwin runtime when using Cygwin.

-- 
cyg Simple

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