On 06.04.2011 22:53, dmex wrote:
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
I'll put that on my todo list once I have a few minutes :D
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.
And that's why I suggested a device driver... so one can add once own
"extensions" without sacrificing compatibility :)
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Sven Barth
Sent: Thursday, 7 April 2011 4:05 AM
To: [email protected]
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: [email protected] [mailto:[email protected]]
On Behalf Of Sven Barth
Sent: Wednesday, 6 April 2011 8:54 PM
To: [email protected]
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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