Home Linux Community Forums Programming and Development Kernel Development Will Printk() output to the standard terminal?

Will Printk() output to the standard terminal?

Link to this post 07 Sep 09

I've put some printk()'s in some of the filesystem files of the linux source tree to try and trace what's going on.
When I run dmesg, I can see a few of my traces, however they aren't showing as I would have expected when I then call the functions again via the terminal.

How can I call some of the system calls and see a modified output?

Link to this post 12 Sep 09

Just gonna answer my own question in-case anyone else is looking for it.

printk() at the default level, outputs to the /var/log/messages file

printk("I am at default level");

The printk level can be defined however to the following levels.

printk(KERN_CRIT "I am a critical level printk");

If it's critical or above, it will print in the terminal as well as /var/log/messages

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