Re: [patch] printk from userspace

["H. Peter Anvin" <hpa@zytor.com>]

Benjamin LaHaise wrote:
> On Tue, Aug 13, 2002 at 09:26:45PM -0700, Linus Torvalds wrote:
> 
>>That said, I like the notion. I've always hated the fact that all the 
>>boot-time messages get lost, simply because syslogd hadn't started, and 
>>as a result things like fsck ran without any sign afterwards. The kernel 
>>log approach saves it all in one place.
>>
>>But /dev/console just sounds potentially _too_ noisy.
> 
> 
> /dev/kmsg was another suggestion for the name.  But please revert the 
> yet-another-syscall variant -- having a duplicate way for logging that 
> doesn't work with stdio just seems sick to me (sys_syslog should die).
> Something like the following untested code is much better.
> 

a) /dev/kmsg bettwe be S_IRUSR|S_IWUSR... reading /{proc,dev}/kmsg 
should drain the ring buffer.

b) Hook up the /proc/kmsg read to this thing.

It really needs to be a /dev node, not a /proc node; procfs is likely 
*not* to be mounted; however, manifesting a /dev node is easy enough.

	-hpa