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SubjectRe: Help offered/tasks wanted - mentor needed
On Thu, Feb 17, 2000 at 11:49:11PM -0600, Jeff Dike wrote:
> > would please point me in the direction of areas needing help, and
> > would be kind enough to give me an introduction to that area of the
> > kernel then I'd be greatfull.
>
> Well, I've got the world's simplest kernel port (the user-mode port - see
> http://user-mode-linux.sourceforge.net). So, if the lower levels of the
> kernel interest you, that's all pretty simple process-level code. Fiddling
> with that ought to be a relatively gentle introduction to the complexity that
> lies above it.
> Jeff
---end quoted text---

my $0.02

Break it into manageable blocks and understand them before moving into
other areas. I would suggest starting with main.c (That's what I am doing.)
To facilitate reading this, I preprocess it and then filter it with this perl
script which is pasted below. This makes it a whole lot easier to read. Of
course, you can run menuconfig to set up <linux/autoconf.h> which defines all
the preprocessor constants in main.c. This may seem weird, but it's how I am
approaching the same problems...

This is released under public domain... It's a quick hack. You may need to
modify it. One potential drawback is gcc removes the c comments prior
to preprosessing. Some might not like that, but I would rather read the
plain bare source... Hope it helps you.

Karen.


#!/usr/bin/perl -w
#
# This file removes the excess empty lines and some other junk from a
# preprocessed c source file. It does not remove the c comments. The
# compiler actually does that magic prior to running the preprocessor.


my $operandfile;
my $basefilename;
my $linetest;
my $linebuf;

die "\n\nYou must enter the file name as the only command line argument!\n\n"
if ($#ARGV != 0);
$operandfile = shift @ARGV;
die "\n\n$operandfile is not a valid file name.\n\n"
unless ( -f $operandfile && -r $operandfile && -w $operandfile );

open(INPUT, $operandfile) || die "Can\'t open $operandfile : $!\n";
# see man perlop->/STRING
chomp ($basefilename=qx<basename $operandfile>);
open(TEMPFILE, ">/tmp/$basefilename.buffer")
|| die "Can\'t open for write /tmp/$basefilename.buffer : $!\n";
select TEMPFILE;
$linetest=0;
while (<INPUT>) {
$linebuf = $_;
s/^[ \t\a\f\r\e]+//;
if (/^\n/ && $linetest == 0) {
print "$linebuf";
$linetest++;
}
elsif (! /^[\n#]/ ) {
$linetest = 0;
print "$linebuf";
}
}
close (INPUT);
close (TEMPFILE);
open (INPUT, ">$operandfile")
|| die "Can't open for write $operandfile : $!\n";
open (TEMPFILE, "/tmp/$operandfile.buffer")
|| die "Can\'t open /tmp/$operandfile.buffer : $!\n";
select INPUT;
while (<TEMPFILE>) {
print INPUT;
}
close (INPUT);
close (TEMPFILE);
# see man perlop->/STRING
qx<rm -f /tmp/$operandfile.buffer>;


--
----
Karen Shaeffer
Neuralscape; (831) 426-8547
Santa Cruz, Ca. 95060
shaeffer@neuralscape.com http://www.neuralscape.com
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