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

[Sven Barth]

On 06.04.2011 21:26, dmex wrote:
> What's wrong with current method of using the memory mapped 'DBWIN_BUFFER'
> file for outputting kernel messages?
>

That I didn't know about it :P

> Two or three different kernel implementations for the same thing seems a bit
> retarded and breaks compatibility with existing applications like Dbgview.
>

I'm just looking at the source of ReactOS from time to time when I have 
the need to check out how a certain function behaves under the hood 
(especially while I ported the Free Pascal compiler to the Native NT 
API), but I weren't yet aware how those debug outputs work.
As Minas mentioned that he'd like to add a syscall/API function 
compareable to syslog I just thought that it would be wiser (from my 
restricted point of view) to write a driver for this that would allow to 
extend the system dynamically.

Regards,
Sven

> -----Original Message-----
> From: ros-dev-bounces at reactos.org [mailto:ros-dev-bounces at reactos.org] On
> Behalf Of Sven Barth
> Sent: Wednesday, 6 April 2011 8:54 PM
> To: ros-dev at reactos.org
> Subject: Re: [ros-dev] Advice required on User-mode to Kernel mode call for
> syslog(2) analog in ROS
>
> 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
>
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