Date: Tue, 25 Apr 2000 20:46:32 +0300 From: Valery Zamarayev <qd@hostel8.kiuca.kiev.ua> To: questions@freebsd.org Subject: Re: some questions about kernel Message-ID: <20000425204632.A27154@inetgate.avt> In-Reply-To: <Pine.GSO.4.10.10004251244190.2414-100000@sun33> References: <Pine.GSO.4.10.10004251244190.2414-100000@sun33>
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On Tue, Apr 25, 2000 at 01:03:32PM +0200, Ariel Burbaickij wrote: > > 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 ? it seems that __P is for the code to compile with different C compilers. I don't remember where it is defined. I don't know why this is necessary, FreeBSD uses one native compiler after all. > 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 there is a hypertext version of the FreeBSD kernel source, I don't remember the URL, but www.freebsd.org has a link -- Valery Zamarayev To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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