Re: [ros-dev] Advice required on User-mode to Kernel mode call for syslog(2) analog in ROS

[Sven Barth]

Am 06.04.2011 02:09, schrieb Minas Abrahamyan:
>   Hi all,
>
>  I'm going to implement dmesg.exe, a ROS application to read dmesg/kmsg
>  buffer (debug messages in kernel buffer),
>  which is filled in by appropriate patch 6018
>  (here: http://www.reactos.org/bugzilla/show_bug.cgi?id=6018 ) (BTW,
>  it's not yet reviewed and not applied!).
>
>  So I'm requesting advice on:
>  What would be the better way for user-mode code to get the contents of
>  kmsg buffer in kernel-space (kdbg)?
>
>  Shortly:
>  Linux has special system call "syslog" (man 2 syslog)
>  FreeBSD uses its special sysctl interface to kernel along with
>  'kern.msgbuf' parameter.
>
>  My questions:
>  Do we need special system call like Linux, or even more, the whole
>  family of them (sysctl('*')) as in BSD?
>  How to implement simple system call for it, now? 
I'm not one of the ReactOS devs and also I'm not writing much here, but 
what about implementing a (legacy type) device driver that provides a 
device object (e.g. \Device\kmsg) that can be read from (no writing 
though) and some code for DeviceIOControl to clear/config the buffer?

Regards,
Sven