halt the system without any broadcast message on the console

halt the system without any broadcast message on the console

[Bosi Daniele]

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Hi all,
on the embedded system I'm working (mpc5121e, linux kernel 2.6.24.6) when I type the command "halt" on the console I see a broadcast message sent to all the users like this:

" Broadcast message from root (console) (Thu May 27 09:04:41 2010):

The system is going down for system halt NOW!"

I'd like to avoid this message on the console I'm using because at production time this has to be a simple serial port for external peripheral connection. (to do this on the command line we'll leave empty the "console" field).

The only way I found to avoid the broadcast message is the command "telinit 0" . In this way no one calls the "shutdown" command that is the one which send the broadcast message.
I did also some tests with the shutdown parameters but none of them erase the broadcast message.

So my questions are:
Does the command  "telinit 0" is safe in order to halt the machine?
Does the command  "telinit 6" is safe in order to reboot the machine?
Are there others commands to do the same work without the broadcast message?


Thanks
Daniele Bosi

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halt the system without any broadcast message on the console

[Bosi Daniele]

Hi all,
on the embedded system I'm working (mpc5121e, linux kernel 2.6.24.6) when I=
 type the command "halt" on the console I see a broadcast message sent to a=
ll the users like this:

" Broadcast message from root (console) (Thu May 27 09:04:41 2010):

The system is going down for system halt NOW!"

I'd like to avoid this message on the console I'm using because at producti=
on time this has to be a simple serial port for external peripheral connect=
ion. (to do this on the command line we'll leave empty the "console" field)=
.

The only way I found to avoid the broadcast message is the command "telinit=
 0" . In this way no one calls the "shutdown" command that is the one which=
 send the broadcast message.
I did also some tests with the shutdown parameters but none of them erase t=
he broadcast message.

So my questions are:
Does the command  "telinit 0" is safe in order to halt the machine?
Does the command  "telinit 6" is safe in order to reboot the machine?
Are there others commands to do the same work without the broadcast message=
?


Thanks
Daniele Bosi

Re: halt the system without any broadcast message on the console

[Benjamin Herrenschmidt]

On Thu, 2010-05-27 at 17:39 +0200, Bosi Daniele wrote:
> 
> I'd like to avoid this message on the console I'm using because at
> production time this has to be a simple serial port for external
> peripheral connection. (to do this on the command line we'll leave
> empty the "console" field).

I'm not sure I understand.

If the serial port has to talk to an external periph, then you don't
want the console on it, in which case it will not have the broadcast
messages. If it's a console, then it will get them ... along with
everything else a console gets.

Cheers,
Ben.