* pipe broken by WSL?
@ 2019-05-01 9:21 Thomas Wolff
2019-05-02 15:37 ` Stephen Carrier
0 siblings, 1 reply; 6+ messages in thread
From: Thomas Wolff @ 2019-05-01 9:21 UTC (permalink / raw)
To: The Cygwin Mailing List
Calling WSL seems to break pipe processing:
(echo 1; echo 2) |
while read line
do
 echo $line
 wsl uname
done
The loop is not repeated. Commenting out the wsl command, it works as
expected. Prefixing wsl with winpty also makes it work.
Thomas
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* Re: pipe broken by WSL?
2019-05-01 9:21 pipe broken by WSL? Thomas Wolff
@ 2019-05-02 15:37 ` Stephen Carrier
2019-05-02 16:26 ` Eliot Moss
0 siblings, 1 reply; 6+ messages in thread
From: Stephen Carrier @ 2019-05-02 15:37 UTC (permalink / raw)
To: cygwin
On Wed, May 01, 2019 at 11:20:59AM +0200, Thomas Wolff wrote:
> Calling WSL seems to break pipe processing:
>
> (echo 1; echo 2) |
> while read line
> do
> Â echo $line
> Â wsl uname
> done
I don't know about wsl, but could it be absorbing the standard input?
What if "wsl uname" is replaced with "wsl uname < /dev/null" ?
Stephen Carrier
BEAR Center
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* Re: pipe broken by WSL?
2019-05-02 15:37 ` Stephen Carrier
@ 2019-05-02 16:26 ` Eliot Moss
2019-05-03 2:32 ` Thomas Wolff
2019-05-03 19:05 ` Andrey Repin
0 siblings, 2 replies; 6+ messages in thread
From: Eliot Moss @ 2019-05-02 16:26 UTC (permalink / raw)
To: cygwin
On 5/2/2019 11:37 AM, Stephen Carrier wrote:
> On Wed, May 01, 2019 at 11:20:59AM +0200, Thomas Wolff wrote:
>> Calling WSL seems to break pipe processing:
>>
>> (echo 1; echo 2) |
>> while read line
>> do
>> Â echo $line
>> Â wsl uname
>> done
>
> I don't know about wsl, but could it be absorbing the standard input?
> What if "wsl uname" is replaced with "wsl uname < /dev/null" ?
You seem to be right; when I add < /dev/null as described, I get
the expected output.
Regards - Eliot
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* Re: pipe broken by WSL?
2019-05-02 16:26 ` Eliot Moss
@ 2019-05-03 2:32 ` Thomas Wolff
2019-05-03 19:05 ` Andrey Repin
1 sibling, 0 replies; 6+ messages in thread
From: Thomas Wolff @ 2019-05-03 2:32 UTC (permalink / raw)
To: cygwin
Am 02.05.2019 um 18:26 schrieb Eliot Moss:
> On 5/2/2019 11:37 AM, Stephen Carrier wrote:
>> On Wed, May 01, 2019 at 11:20:59AM +0200, Thomas Wolff wrote:
>>> Calling WSL seems to break pipe processing:
>>>
>>> (echo 1; echo 2) |
>>> while read line
>>> do
>>> Â Â echo $line
>>> Â Â wsl uname
>>> done
>>
>> I don't know about wsl, but could it be absorbing the standard input?
>> What if "wsl uname" is replaced with "wsl uname < /dev/null" ?
>
> You seem to be right; when I add < /dev/null as described, I get the
> expected output.
Yes, indeed. Thanks.
Thomas
>
> Regards - Eliot
>
> --
> Problem reports:Â Â Â Â Â Â http://cygwin.com/problems.html
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>
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* Re: pipe broken by WSL?
2019-05-02 16:26 ` Eliot Moss
2019-05-03 2:32 ` Thomas Wolff
@ 2019-05-03 19:05 ` Andrey Repin
2019-05-04 6:49 ` Thomas Wolff
1 sibling, 1 reply; 6+ messages in thread
From: Andrey Repin @ 2019-05-03 19:05 UTC (permalink / raw)
To: Eliot Moss, cygwin
Greetings, Eliot Moss!
> On 5/2/2019 11:37 AM, Stephen Carrier wrote:
>> On Wed, May 01, 2019 at 11:20:59AM +0200, Thomas Wolff wrote:
>>> Calling WSL seems to break pipe processing:
>>>
>>> (echo 1; echo 2) |
>>> while read line
>>> do
>>> echo $line
>>> wsl uname
>>> done
>>
>> I don't know about wsl, but could it be absorbing the standard input?
>> What if "wsl uname" is replaced with "wsl uname < /dev/null" ?
> You seem to be right; when I add < /dev/null as described, I get
> the expected output.
Why not just
wsl uname <&-
I wonder?
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With best regards,
Andrey Repin
Friday, May 3, 2019 21:51:38
Sorry for my terrible english...
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* Re: pipe broken by WSL?
2019-05-03 19:05 ` Andrey Repin
@ 2019-05-04 6:49 ` Thomas Wolff
0 siblings, 0 replies; 6+ messages in thread
From: Thomas Wolff @ 2019-05-04 6:49 UTC (permalink / raw)
To: cygwin
Hello Andrey,
Am 03.05.2019 um 20:52 schrieb Andrey Repin:
> Greetings, Eliot Moss!
>
>> On 5/2/2019 11:37 AM, Stephen Carrier wrote:
>>> On Wed, May 01, 2019 at 11:20:59AM +0200, Thomas Wolff wrote:
>>>> Calling WSL seems to break pipe processing:
>>>>
>>>> (echo 1; echo 2) |
>>>> while read line
>>>> do
>>>> Â echo $line
>>>> Â wsl uname
>>>> done
>>> I don't know about wsl, but could it be absorbing the standard input?
>>> What if "wsl uname" is replaced with "wsl uname < /dev/null" ?
>> You seem to be right; when I add < /dev/null as described, I get the expected output.
> Why not just
>
> wsl uname <&-
>
> I wonder?
That gives me an error "Invalid handle", or, using `head` instead of
`wsl`: head: failed to reopen 'stdin' with mode 'rb': Bad file descriptor.
By the way, a funny variant of the test case is
(echo 1; echo 2) |
while read line
do
 echo $line
 head -1
done
(Add an 'x' marker to the echo to watch the intricacies...)
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end of thread, other threads:[~2019-05-04 6:49 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2019-05-01 9:21 pipe broken by WSL? Thomas Wolff
2019-05-02 15:37 ` Stephen Carrier
2019-05-02 16:26 ` Eliot Moss
2019-05-03 2:32 ` Thomas Wolff
2019-05-03 19:05 ` Andrey Repin
2019-05-04 6:49 ` Thomas Wolff
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