Re: [Qemu-devel] Re: VNC Password

[Anthony Liguori <anthony@codemonkey.ws>]

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Volkan YAZICI wrote:
> On Thu, 23 Oct 2008, Gerd Hoffmann <kraxel@redhat.com> writes:
>   
>> Volkan YAZICI wrote:
>>     
>>> On Thu, 23 Oct 2008, "Daniel P. Berrange" <berrange@redhat.com> writes:
>>>       
>>>> If you want daemonized instances, and wish to use the monitor, then
>>>> rather than using '-monitor stdio', it'd be better to have it connect
>>>> to something like a UNIX socket, eg
>>>>
>>>>    -monitor unix:/var/run/qemu/mysock,server
>>>>         
>>> Excuse my ignorance, but when I use above command, qemu types "QEMU
>>> waiting for connection on: /var/run/qemu/monitor.preprod" on the command
>>> line and hangs at that state. Is this something expected?
>>>       
>> Yes.  If you don't want that, add ",nowait".
>>     
>
> This time it complains with an interesting error message:
>
>   # rlwrap /usr/local/sbin/qemu-preprod
>   qemu: could not open monitor device 'unix:/var/run/qemu/preprod.monitor,nowait'
>   

You need unix:/var/run/qemu/preprod.monitor,server,nowait

I use the following program to send commands to the monitor.  You would 
use it like:

$ qemu-remote /var/run/qemu/preprod.monitor help

Regards,

Anthony Liguori

>   # ls -l /var/run/qemu/preprod.monitor
>   -rw-r--r-- 1 root root 0 2008-10-23 14:56 /var/run/qemu/preprod.monitor
>
> BTW, how can I connect to the monitor session -- if I can get it right
> at last -- that will be pointed by /var/run/qemu/preprod.monitor?
>   
>   
>> Try "nc localhost:5001" instead.  Qemu listens on the loopback interface
>> only if you specify display "localhost:1".  netstat should show that.
>>     
>
> Umm... Actually, no. I can see it listens on 5901.
>
>
> Regards.
>
>
>   


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#!/usr/bin/env python

import socket, sys

if len(sys.argv) < 2:
    print 'Usage: %s SOCKET' % sys.argv[1]
    sys.exit(1)

s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(sys.argv[1])
s.sendall('%s\n' % ' '.join(sys.argv[2:]))

buf = ''
while not buf.endswith('\n(qemu) '):
    buf += s.recv(1)

noend = False
buf = ''
while not buf.endswith('\n(qemu) '):
    t = s.recv(1)
    if len(t) == 0:
        noend = True
        break
    buf += t

if not noend:
    buf = buf[:-7]

_, buf = buf.split('\n', 1)

sys.stdout.write(buf)
sys.stdout.flush()

s.close()