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Subject: Re: Cygwin bash for loops : repeated errors : [main] bash 1972 fork: child -1 - CreateProcessW failed for <bash.exe> errno 9 bash: fork: Bad file descriptor
To: cygwin@cygwin.com
References: <56025A43.9000604@null.net>
From: Marco Atzeri <marco.atzeri@gmail.com>
Message-ID: <56026DAF.2050309@gmail.com>
Date: Wed, 23 Sep 2015 11:15:27 +0200
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On 23/09/2015 09:52, litter@null.net wrote:
> Hi all,
>
> On a Windows XP 32 bit machine with latest Cygwin installed
> (CYGWIN_NT-5.1 <machine> 2.2.1(0.289/5/3) 2015-08-20 11:40 i686 Cygwin)
> I frequently encounter errors which break bash while loops, making it practically unusable
>
> e.g.
> cat some-file | while read i;do grep text $i;done
>
> results in
> 2 [main] bash 1972 fork: child -1 - CreateProcessW failed for '<cygwin install path>\bin\bash.exe', errno 9
> bash: fork: Bad file descriptor
>
> The error is unpredictable, in a next run everything can run fine again.
>
> I already checked for some common errors, but could not find anything.
>
> Any help is appreciated.
>
> Thanks,
> Paul
>

It seems a race problem, due to the repetitive fork of grep
for every line of some-file

I suggest to rethink the command.

   awk '{if ($1 ~ /text/) print $1}' some-file

Regards
Marco

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