amd64/188699: Dev tree

[John Baldwin]

On Thursday, April 17, 2014 2:50:01 pm Konstantin Belousov wrote:
> The following reply was made to PR amd64/188699; it has been noted by GNATS.
> 
> From: Konstantin Belousov <kostikbel at gmail.com>
> To: John Allman <freebsd at hugme.org>
> Cc: freebsd-gnats-submit at FreeBSD.org
> Subject: Re: amd64/188699: Dev tree
> Date: Thu, 17 Apr 2014 21:44:52 +0300
> 
>  On Wed, Apr 16, 2014 at 05:32:45PM +0000, John Allman wrote:
>  > This is how to reproduce it:
>  > 
>  > Fresh install of 10 on AMD 64
>  > install bash `pkg install bash`
>  > Switch to bash `bash`
>  > push a here document into a loop: `while true ; do echo; done< <(echo "123")`
>  > receive an error: "-su: /dev/fd/62: No such file or directory"
>  > 
>  > I'm sorry I haven't been able to research this any further. I found how while working on some important matters. As I mentioned the above works fine in all 
previous versions of FreeBSD up until 10.
>  > >How-To-Repeat:
>  > Fresh install
>  > pkg install bash
>  > bash
>  > while true; do echo foo done< <(echo "123")
>  > 
>  > -su: /dev/fd/62: No such file or directory
>  
>  So do you have fdescfs mounted on /dev/fd on the machine where the
>  test fails ?  It works for me on head, and if unmounted, I get the
>  same failure message as yours.  I very much doubt that it has anything
>  to do with a system version.

Question I have is why is bash deciding to use /dev/fd/<n> and require
fdescfs?  On older releases bash uses named pipes for this instead.

-- 
John Baldwin