Date: Tue, 25 Apr 2000 13:03:32 +0200 (MET DST) From: Ariel Burbaickij <Ariel.Burbaickij@mni.fh-giessen.de> To: questions@freebsd.org Subject: some questions about kernel Message-ID: <Pine.GSO.4.10.10004251244190.2414-100000@sun33>
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I try to read some kernel sources of FreeBSD equipped with
book of Lions ,Bach and McKusick.What i saw was rather excessive
use of macros of rather complex nature (as for me surely) and
whole lot of #ifdefs , iterative #defines and some simmilar stuff
I have not seen usage of these progamming methods so far neither
im Lions book nor in Minix(sources I have seen so far)
So my first and some futher questions are:
1) Why was such excessive usage of macros metohod of choice?
2) What is __P macro used in many places in kernel sources?
my tip is:It is macro with variable count of arguments(
thing I have not seen before,would someone expalin why it was
neccesary)Would you expalin this technik to me ?
3) How can i strip the sources from these #ifdefs,#defines and
get macros extended(I know i have to use cpp but it will
produce a whole lot empty lines bearing no information.
Besides,i do not know whether is it possible to use
cpp on whole hierarchies of source files)
My 4 question is about implelemtation of some well-known fuction
in FreeBSD
I tried to locate some well-known in some circles surely :))
functions(e.g. ialloc ,iput,ifree,iget)with some helpful
tools as gtags and flobal amd got a good dozen of files.
Same is true about buffer allocating functions.
So the questions is:
4) Maybe somecatalogue is maintained with information about
where(in what file)each function is definied?Some functions
were probably re-named so maybe some another catalogue exists with
mapping between old-style names to new-style names ?
With old-style I mean books of Bach , Lion and Tannenbaum
Kind regards,
Ariel
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