Message-ID: <4AAFA025.3050401@codemonkey.ws>
Date: Tue, 15 Sep 2009 09:09:41 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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To: Gerd Hoffmann <kraxel@redhat.com>
CC: Amit Shah <amit.shah@redhat.com>, Alan Cox <alan@linux.intel.com>,
       rusty@rustcorp.com.au, virtualization@lists.linux-foundation.org,
       linux-kernel@vger.kernel.org, greg@kroah.com
Subject: Re: [PATCH] virtio_console: Add support for multiple ports for generic
 guest and host communication
References: <1252678386-17404-1-git-send-email-amit.shah@redhat.com> <1252678386-17404-2-git-send-email-amit.shah@redhat.com> <20090911170010.34c80f2d@linux.intel.com> <20090915123752.GB5247@amit-x200.redhat.com> <4AAF8F26.8030503@codemonkey.ws> <4AAF9FD8.1010008@redhat.com>
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Gerd Hoffmann wrote:
>> Userspace can detect when new virtio-consoles appear via udev events.
>> When it sees a new ttyVN, it can then look in sysfs to discover it's 
>> name.
>
> No.  udev can create symlinks for you, so apps don't have to dig into 
> sysfs.  You'll need a rule along the lines (untested):
>
>    SUBSYSTEM=="virtio", \
>    DRIVERS="virtio-console", \
>    SYMLINK+="vcon/$attr{name}"
>
> then udev will create a /dev/vcon/org.qemu.clipboard symlink pointing 
> to dev/ttyV0.  Apps can just open /dev/vcon/$name then.

That works equally well.  I don't necessarily think that naming is more 
useful.

Regards,

Anthony Liguori
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