Re: dumb question: How to create your own log files in a kernel module?

[Xin Zhao]

Thanks for kind help. 

I know printk can do this job. But what I really want is to print logs
to a file specified by me instead of /var/log/messages. And, the
messages irrelevant to my module should not be written into that file.
 Now my log mixed with other logs in /var/log/message, which bother me
much. :(

I guess the KERN_PRIVATE might work for this. Can you give me more details?

Thanks again!

Xin

On 4/28/05, Richard B. Johnson <linux-os@xxxxxxxxxxxx> wrote:
> On Thu, 28 Apr 2005, Xin Zhao wrote:
> 
> > Can anyone give me a hand? or point me to somewhere I can find related
> > information?
> >
> > Thanks in advance!
> >
> > Xin
> 
> printk(KERN_XXX"whatever") was designed for this.
> 
> #define KERN_EMERG      "<0>"   /* system is unusable                   */
> #define KERN_ALERT      "<1>"   /* action must be taken immediately     */
> #define KERN_CRIT       "<2>"   /* critical conditions                  */
> #define KERN_ERR        "<3>"   /* error conditions                     */
> #define KERN_WARNING    "<4>"   /* warning conditions                   */
> #define KERN_NOTICE     "<5>"   /* normal but significant condition     */
> #define KERN_INFO       "<6>"   /* informational                        */
> #define KERN_DEBUG      "<7>"   /* debug-level messages                 */
>         printk(KERN_DEBUG fmt,##arg)
>         printk(KERN_INFO fmt,##arg)
> 
> You could define your own, KERN_PRIVATE "<8>" and have the syslog
> facility filter on that.
> 
> Other ways are to write stuff to a buffer or linked-list and
> read it out using an ioctl() or read() in your module. If you
> do this, make sure that your module code doesn't wait forever
> if the buffer gets full.
> 
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.6.11 on an i686 machine (5537.79 BogoMips).
>   Notice : All mail here is now cached for review by Dictator Bush.
>                   98.36% of all statistics are fiction.
>
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