[wplug] Linux Programming Book

Weber, Larry A laweber at switch.com
Wed Apr 16 15:12:36 EDT 2003 

Thanks to John, Mike, Dave, Brian, and Eric.  I had fumbled with this
problem for several days.  With your help, it is up and running in a few
hours.  WPLUG is an impressive resource.

Only one question left.  /usr/include/linux contains all the kernel header
files, but they don't compile.  So what good are they?  Other than to
confuse me and waste my time do they have any value?

> -----Original Message-----
> From:	Dave Neuer [SMTP:mr_fred_smoothie at yahoo.com]
> Sent:	Wednesday, April 16, 2003 2:56 PM
> To:	wplug at wplug.org
> Subject:	RE: [wplug] Linux Programming Book
> 
> 
> --- "Weber, Larry A" <laweber at switch.com> wrote:
> > What is unclear is why are there so many kernel
> > header sets?  My Red Hat 8.0
> > has kernel .h sets at  /usr/include/linux, 
> > /usr/src/linux-2.4, and
> > /usr/src/linux-2.4.18-14.  The example program will
> > not compile with the
> > first set of .h files but will compile with the
> > other two.
> 
> Well, the first set of headers in this case
> (/usr/include/*) is probably just the default set that
> come w/ glibc when compiled for Linux. I.e., you only
> have headers there which are required to build
> Posix/Linux applications (NOT kernel modules).
> 
> The latter two (if one's not just a symlink to the
> other) are the full set of kernel header files,
> including the internal stuff that only in-kernel code
> needs to see.
> 
> > Of course the
> > resulting .o files will not work.  The modules
> > install (insmod), with plenty
> > of warnings, and uninstall (rmmod) but never
> > execute.
> 
> What warnings? Unresolved symbols? Are you sure they
> get inserted (or are you forcing them w/ insmod -f )?
> I assume you're doing 'lsmod' to make sure they're
> there, right?
> 
> How are you determining that they didn't execute? Make
> sure you're looking in the correct logfile for the
> loglevel you've chosen.
> 
> > 
> > Just ordered a bunch of books on the kernel,  hope
> > they help.
> 
> Jon Corbet's book (Linux Device Drivers?) is good,
> plus I like "Understanding the Linux Kernel" though it
> was written for 2.2. Using it w/ 2.4 is still helpful
> (since the kernel source is available ;-))
> 
> Good luck,
> Dave
> 
> > 
> > 
> > > -----Original Message-----
> > > From:	Dave Neuer [SMTP:mr_fred_smoothie at yahoo.com]
> > > Sent:	Wednesday, April 16, 2003 12:53 PM
> > > To:	wplug at wplug.org
> > > Subject:	RE: [wplug] Linux Programming Book
> > > 
> > > The problem is more likely that you don't have the
> > > distro-specific "kernel-headers" package
> > installed.
> > > 
> > > This is something that pisses me off about distros
> > > (even though since disk space may be limited, it's
> > > easy to see why -- and even reasonable that they
> > do
> > > it): they force you to install "*-dev" packages
> > > separately from the main software packages, as if
> > > everyone who installs software on a Linux box is
> > some
> > > "dumb user" who will never want to compile an app
> > > themselves.
> > > 
> > > In fact, the opposite is probably still true w/
> > Linux;
> > > most people running it will probably have occasion
> > to
> > > compile some application by hand from source, and
> > it's
> > > not that helpful then to have "libthis" and
> > "libthat"
> > > installed w/ out "libthis-dev" and "libthat-dev".
> > I
> > > have to admit that of all distros, Debian actually
> > > seems the worst as far as this goes.
> > > 
> > > Of course, kernel hackers and module authors are
> > > probably more rare than "people who have to
> > > occasionaly compile some userspace app to get the
> > > latest-and-greatest feature", but still. What
> > freakin'
> > > Linux system shouldn't have kernel headers
> > installed
> > > by default in some *default* include search path?
> > At
> > > the very least, if you've installed gcc and
> > binutils
> > > or other "devlopment" tools, they should install
> > the
> > > kernel headers by default.
> > > 
> > > Dave
> > > 
> > > --- "Weber, Larry A" <laweber at switch.com> wrote:
> > > > Probably not.  Linux kernels seem to change
> > pretty
> > > > fast.  Author claims the
> > > > application works when compiled on RH71. and
> > RH7.1. 
> > > > I am using RH8.0.  I
> > > > don't know which kernel came with the earlier
> > revs
> > > > of RH
> > > > 
> > > > > -----Original Message-----
> > > > > From:	Brian Sammon [SMTP:brians+ at cs.cmu.edu]
> > > > > Sent:	Wednesday, April 16, 2003 11:31 AM
> > > > > To:	wplug at wplug.org
> > > > > Subject:	Re: [wplug] Linux Programming Book
> > > > > 
> > > > > > I would like to hear from anyone in WPLUG
> > who
> > > > has read the book
> > > > > "Practical
> > > > > > Linux Programming: Device Drivers, Embedded
> > > > Systems, and the Internet"
> > > > > > Author Ashfaq A. Khan
> > > > > > 
> > > > > > I cannot get any of the example programs to
> > > > compile and would like to
> > > > > talk
> > > > > > to anyone who has been successful.
> > > > > 
> > > > > One question that springs to mind-- 
> > > > > Are you using the same kernel revision that
> > the
> > > > author based the book on?
> > > > > 
> > > > > 
> > > > >
> > _______________________________________________
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> > > > > wplug at wplug.org
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> > > 
> > > 
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