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Re: Bad file descriptor with coproc and pipe

From: Michal Sojka
Subject: Re: Bad file descriptor with coproc and pipe
Date: Wed, 05 Feb 2014 22:37:43 +0100
User-agent: Notmuch/0.17 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu)

On Wed, Feb 05 2014, Chet Ramey wrote:
> On 2/4/14, 2:34 AM, Michal Sojka wrote:
>> Bash Version: 4.2
>> Patch Level: 45
>> Release Status: release
>> Description:
>>      The following commands fail:
>>          coproc while true; do echo $RANDOM; done
>>          cat <&${COPROC[0]} | cat
>>      The resulting error message is:
>>          bash: ${COPROC[0]}: Bad file descriptor
> Bash closes file descriptors associated with coprocs in child processes,
> since they are pipes.  It's even more careful when those child processes
> are part of pipelines.  It's really a bad idea to have pipe file
> descriptors open in multiple processes; that prevents SIGPIPE generation
> and EOF on read when one writer exits.

Thanks for the explanation. Then the bug is that it is not documented:

Btw. zsh allows using file descriptors this way.

Best regards,

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