Re: My script makes a defunct subshell and sticks on read

[Chet Ramey]

On 1/31/18 6:09 AM, Øyvind Hvidsten wrote:

> 
> It will also lock up when run like this, without opening and closing the
> file descriptor repeatedly. A missed signal, perhaps?
> 
> exec {fd}<> <(:); for ((i=0; ; i++)); do ((i%100)) || echo $i; read -t
> 0.001 -u $fd; done

It might be a signal problem. I'll take a look.

> Note I also turned the pipe around so it's opened for read only instead of
> write :)

It still seems problematic that Linux allows the /dev/fd file to be
opened read-write when the underlying file descriptor is read-only. A
different (BSD) implementation rejects the open altogether.

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