Re: user space - kernel space howto

Hi Steven

Thanks for your feedback!

Steven wrote:
>>  have put a very early version of my proposed user
space -
>>  kernel space communication howto on my homepage
>> [ http://peop
le.ee.ethz.ch/~arkeller/linux/ ]
> 
> Hmmm.. Imho very readable and interesting technical
document.
> I like it :> It's pretty ambitious too. Good luck.
> 
> I hope i've understood you properly as i haven't gone
> through it fully. It's a fairly technical and abstract
> topic, and I'm not sure who/what it's meant for.
It is meant for a developer who has to write an application
which 
consists of a user space and a kernel space part. I had to
do this 
several times, and I always had to figure out how my kernel
module and 
the user space process could communicate.

> Would it be possible to post a single page version as
well ?
I've just put it online.

> 
> Have you checked for similar stuff around the web ?
Yes, but I could not find an overview over all the
possibilities. What I 
found are several documents which discuss one of the topics.
Therefore 
each topic has a section "Further Reading and
Resources" which points to 
some interesting articles.

> 
> Steven.
> 
> ----------------------------------------------------
> 
> Criticisms:
> 
> I found the introduction and titles too abstract, and
after
> reading the memory/copying section, was wondering what
the
> point was. Would a more concise intro ~like~ this
help:
> 
> "This document looks at the numerous and
interesting ways
> the Linux kernel interacts with the user and user space
programs.
> These include explanations of Sockets, Procfs and
simliar
> virtual filesystems, creating new Kernel System calls,
> as well as mundane file and memory handling."
Thanks for this intro! I like it 

> 
> I'd rename the
> "Read and Write Functions of RAM Based File
Systems"
> section to
> "Procfs, Sysfs, and similar kernel
interfaces"
ok

> and
> "System Call" to "Kernel System
Calls"
ok
> and
> "Signals" -> "Terminating Processes
and other Signals"
hm, there is not yet anything about terminating
processes---

> Perhaps rename the doco to "Linux Kernel
Interfaces" ???
> (if this is correct).
Maybe, but I'm not sure whether it is 100% accurate. It
should somehow 
reflect the fact, that it covers the interfaces exposed to
the user 
space and not the kernel internal interfaces. Maybe a better
name would 
be: "Linux Kernel Interfaces for User Space
Applications"

> 
> The signal section is way too abstract and short at
the
> moment. Some examples here (and elsewhere?) would
help.
Yes, I know. The sections at the end are too short.
The examples are mostly in the source files which are linked
to the 
document.

> 
> An overview of sequential io filesystems would be very
> interesting..  though this might be too hard to do well
in a
> short space and not fall within the scope of the doco.
In the section procfs there are some pointers to seqfile
documentation

Thanks again for your feedback!
Ariane

> 
>        
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