[uml-user] Re: UML hangs if pipe'd to

[Matt P. <mp...@he...>]

On Wed, Jul 27, 2005 at 11:33:44AM +0200, Kyrre M Begnum wrote:
> I am using uml in a setting where i am only interested in the output of=
=20
> its console, and won't give it any console input.
> I have encountered a phenomenon that if i pipe something to the uml=20
> command the boot freezez at:
>=20
> echo something | ./linux ......
> .
> .
> .
> kjournald starting.  Commit interval 5 seconds
> EXT3-fs: mounted filesystem with ordered data mode.
> VFS: Mounted root (ext3 filesystem) readonly.
> *hang*

Aaah, yes.  I recently tangled with this (or a closely related) problem in
GUML.  I think you'll find that the UML isn't actually hanging, it's just
that no output is produced.  The way I solved the problem was to ensure that
the standard input of the UML process is closed.  A quick run through the
bash manpage suggests that

echo something | ./linux ...... <&-=20

should be a suitable invocation.

Give it a whirl, if it doesn't work you're only out a few keystrokes.=20
<grin>

- Matt