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Re: Coprocess FD not available when duplicated to FD other than 1 or 2
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From: |
Chet Ramey |
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Subject: |
Re: Coprocess FD not available when duplicated to FD other than 1 or 2 |
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Date: |
Wed, 19 Oct 2016 09:41:23 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
On 10/19/16 8:24 AM, lolilolicon wrote:
> The following correctly prints "fd=2":
>
> coproc p { head -1; }
> 2>&${p[1]} bash -c 'echo fd=2 >&2'
> cat <&${p[0]}
>
> Change 2 to 3, throws error: "bash: 3: Bad file descriptor":
>
> coproc p { head -1; }
> 3>&${p[1]} bash -c 'echo fd=3 >&3'
> cat <&${p[0]}
>
> I'm not very familiar with redirection, so I may have overlooked
> something obvious...
>
> What am I missing?
File descriptors greater than 2 are set to close-on-exec in child
processes.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/