[Qemu-devel] Problem with the -serial option of qemu

[Qemu-devel] Problem with the -serial option of qemu

[The MoonSeeker]

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Hi everyone,

I'm on gentoo 2.6.20-gentoo-r8 and I'm trying to send the serial port  
of my linux guest to a tcp server. To do that, i use this command :

qemu -hda linux.img -serial tcp::4000,server,nowait

And I get this error :

qemu: could not open serial device 'tcp::4000,server,nowait'

I was using the same command on Ubuntu 6.06 and that was working. I  
don't understand what's happen and how can I debug this?

Thx for help!

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Re: [Qemu-devel] Problem with the -serial option of qemu

[Jason Wessel]

The MoonSeeker wrote:
> Hi everyone,
>
> I'm on gentoo 2.6.20-gentoo-r8 and I'm trying to send the serial port 
> of my linux guest to a tcp server. To do that, i use this command :
>
> qemu -hda linux.img -serial tcp::4000,server,nowait
>
> And I get this error :
>
> qemu: could not open serial device 'tcp::4000,server,nowait'
>
> I was using the same command on Ubuntu 6.06 and that was working. I 
> don't understand what's happen and how can I debug this?
>
> Thx for help!
Make sure you are running the same version of QEMU in both places.  
Generally speaking if it says it could not open the device, it is 
because something else is using the port.

% netstat -an |grep 4000
tcp        0      0 0.0.0.0:4000                
0.0.0.0:*                   LISTEN     

% lsof -nP |grep 4000
redirector  15998   jwessel    3u     IPv4    1661621              TCP 
*:4000 (LISTEN)

In this example I started up an application called redirector on the 
port.  I do not believe this issue is a qemu defect of any kind.

Cheers,
Jason.

Re: [Qemu-devel] Problem with the -serial option of qemu

[The MoonSeeker]

On my ubuntu I have qemu 0.9.0 And on my Gentoo I have 0.8.1. Now I  
don't know howto install qemu 0.9.0 on my gentoo with GCC4 and a  
2.6.20 kernel. If I install GCC3, I have to change my kernel. Any  
idea to avoid this? And use GCC4 with qemu 9.0.x?
Finally, I don't have anything on the port 4000 :

TinyGentoo ~ # netstat -an | grep 4000
TinyGentoo ~ #

THX
Francis



On Jul 5, 2007, at 5:44 PM, Jason Wessel wrote:

> The MoonSeeker wrote:
>> Hi everyone,
>>
>> I'm on gentoo 2.6.20-gentoo-r8 and I'm trying to send the serial  
>> port of my linux guest to a tcp server. To do that, i use this  
>> command :
>>
>> qemu -hda linux.img -serial tcp::4000,server,nowait
>>
>> And I get this error :
>>
>> qemu: could not open serial device 'tcp::4000,server,nowait'
>>
>> I was using the same command on Ubuntu 6.06 and that was working.  
>> I don't understand what's happen and how can I debug this?
>>
>> Thx for help!
> Make sure you are running the same version of QEMU in both places.   
> Generally speaking if it says it could not open the device, it is  
> because something else is using the port.
>
> % netstat -an |grep 4000
> tcp        0      0 0.0.0.0:4000                 
> 0.0.0.0:*                   LISTEN
> % lsof -nP |grep 4000
> redirector  15998   jwessel    3u     IPv4    1661621               
> TCP *:4000 (LISTEN)
>
> In this example I started up an application called redirector on  
> the port.  I do not believe this issue is a qemu defect of any kind.
>
> Cheers,
> Jason.

Re: [Qemu-devel] Problem with the -serial option of qemu

[Jan Marten Simons]

The MoonSeeker schrieb:
> On my ubuntu I have qemu 0.9.0 And on my Gentoo I have 0.8.1. Now I 
> don't know howto install qemu 0.9.0 on my gentoo with GCC4 and a 2.6.20 
> kernel. If I install GCC3, I have to change my kernel. Any idea to avoid 
> this? And use GCC4 with qemu 9.0.x?
> Finally, I don't have anything on the port 4000 :
> 

You have to select a gcc3-profile without pie or ssp via gcc-config 
before quilding qemu-softmmu or qemu-user. for kqemu you have to use the 
same compiler used to compile your kernel.

regs,
Jan