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

[Sven Barth]

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: [e-mail] [mailto:[e-mail]] On
> Behalf Of Sven Barth
> Sent: Thursday, 7 April 2011 4:05 AM
> To: [e-mail]
> 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: [e-mail] [mailto:[e-mail]]
> > On Behalf Of Sven Barth
> > Sent: Wednesday, 6 April 2011 8:54 PM
> > To: [e-mail]
> > 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
> >
> > Ros-dev mailing list
> > [e-mail]
> > http://www.reactos.org/mailman/listinfo/ros-dev
> >
> > Ros-dev mailing list
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