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

[dmex]

DebugPring/OutputDebugString would be a good place to start learning how
Windows outputs kernel messages ;)
http://sumeshvv.wordpress.com/2010/12/02/how-the-outputdebugstring-api-works
/

ReactOS OutputDebugString Source:
http://doxygen.reactos.org/da/def/dll_2win32_2kernel32_2debug_2output_8c_a94
90feb381d7062ca6e5a28bdeacd6d2.html

Minas's idea is terrible in my opinion, "Do we need special system call like
Linux, or even more, the whole family of them (sysctl('*')) as in BSD?" as
ReactOS is designed for binary compatibility with Windows, Not BSD or Linux
and it should stay that way.

-----Original Message-----
From: ros-dev-bounces(a)reactos.org [mailto:[e-mail]] On
Behalf Of Sven Barth
Sent: Thursday, 7 April 2011 4:05 AM
To: ros-dev(a)reactos.org
Subject: Re: [ros-dev] Advice required on User-mode to Kernel mode call for
syslog(2) analog in ROS

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(a)reactos.org [mailto:[e-mail]] 
> On Behalf Of Sven Barth
> Sent: Wednesday, 6 April 2011 8:54 PM
> To: ros-dev(a)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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