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Re: fd leak with {fd}>


From: Pierre Gaston
Subject: Re: fd leak with {fd}>
Date: Fri, 23 Nov 2012 09:04:30 +0200

On Thu, Nov 22, 2012 at 9:15 PM, Chet Ramey <address@hidden> wrote:

> On 11/16/12 10:47 AM, Sam Liddicott wrote:
> > Repeated executions of: { echo $fd ; } {fd}> /dev/null
> > will emit different numbers, indicating that fd is not closed when the
> > block completes.
>
> This is intentional.  Having been given a handle to the file descriptor,
> the shell programmer is assumed to be able to manage it himself.
>
>
It seems rather counter intuitive that the fd is not closed after leaving
the block.
With the normal redirection the fd is only available inside the block

$ { : ;} 3>&1;echo bar >&3
-bash: 3: Bad file descriptor

if 3 is closed why should I expect {fd} to be still open?


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