Can anyone give me a hand? or point me to somewhere I can find related
information?
Thanks in advance!
Xin
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.
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 <[email protected]> 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.
>
Hi Xin,
>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. :(
>
You seem to make a confusion here...
Don't forget that files are only an abstraction for userspace. They are
only meant to be read and written from userspace. Kernel code can never
read or write files. In the case of /var/log/messages, this file is
created by the syslogd program from the kernel buffer, not by the kernel
itself.
You could just echo something specific to your driver in your printk
strings, and grep this specific thing in /var/log/messages. You have
your file!
Cheers,
Michael.
--
Michael Opdenacker
http://free-electrons.com
+33 621 604 642
On Thu, Apr 28, 2005 at 02:10:39PM -0400, Xin Zhao wrote:
> Can anyone give me a hand? or point me to somewhere I can find
> related information?
man syslogd
Xin Zhao <[email protected]> wrote:
> 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.
RTFM.
man 5 syslogd.conf
--
Funny quotes:
39. Ever wonder about those people who spend $2.00 apiece on those little
bottles of Evian water? Try spelling Evian backwards: NAIVE