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Re: leaks fd for internal functions but not external command


From: Chet Ramey
Subject: Re: leaks fd for internal functions but not external command
Date: Tue, 23 Jul 2019 11:05:22 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 7/23/19 10:33 AM, Sam Liddicott wrote:

> Bash Version: 4.4
> Patch Level: 20
> Release Status: release
> 
> Description:
> Bash redirection sequence cases a file descriptor to be leaked
> if the main command is an internal function but not if it is
> an external command.

It's not `leaked': you have a handle on it and can manipulate it as you
wish.

> Based on prior conversation, I suspect it is supposed to leak
> in the internal case (though that is annoying) but it is
> inconsistent that it does not for the external case.

It's set to close-on-exec. If you want to use it in a child process,
you have a handle that you can use to dup to another fd.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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