[nmglug] Unix symbolic links

[a]

le Nguyen:

Thanks your interest in responding,not working yet,will put it aside for
tonight,and try a more elemental program,one with fewer warnings and
error messages.

This program "Pasteco",sourceforge, is a stepper motor parallel port
driver.
                                            Tnx, Antonio K

On Fri, 2009-07-03 at 12:55 -0600, Le Nguyen wrote:
>         Hi Antonio K
> 
> 
> I haven't touched Unix for quite a while now, so I may be wrong. I
> hope the other experts will correct me on this.
> 
> 
> Basically you're trying to create a symbolic link for the compiler to
> find a specific include file. The compiler will (unless told otherwise
> via the -I... flag on the $CC command line) go to a specific location
> to find the include files which are mentioned at the top of your C
> programs ( the default pathname used by the compiler is /include  or
>  /usr/include, my memory is failing, please double-check).
> This way you can "upgrade" to newer source code or keep several
> version of the source code around, and whatever include subtree is
> linked to /usr/include is what the compiler will use.
> 
> 
> So I'd run the following command once (assuming your login has the
> permissions to create a symlink - note that the first 2 letters of the
> command are LN in lower-case):
> 
> 
> ln   -s    /usr/src/linux-headers-2.6.28-13-generic/include
>   /usr/include
> 
> 
> on the other hand, if the other include files under /usr/include are
> just fine, and you just want to use the kernel includes for this
> specific version, then the following command would be better:
> 
> 
> ln   -s    /usr/src/linux-headers-2.6.28-13-generic/include/linux
>   /usr/include/linux
> 
> 
> After this the compiler will see the whole subtree of include files
> (under /usr/include/linux) which go with your linux kernel version
> 2.6.28-13
> Your proposed command is a little bit too restrictive, and you may end
> up creating dozens of symlinks when a single one at the proper
> location of the include subtree will do.
> 
> 
> Let me know how it goes.
> Le Nguyen
> 
> 
>         
>         
>         ---------- Forwarded message ----------
>         From: a <akaluta at taosnet.com>
>         To: nmglug at nmglug.org
>         Date: Fri, 03 Jul 2009 07:41:35 -0600
>         Subject: [nmglug] Write loadable kernel module
>         Attempting to follow several basic tutorials, writing first
>         loadable
>         kernel module, each attempt has been foiled by something like
>         the
>         following:
>         
>         Example:
>         #include <linux/module.h>   error: linux/module.h  no such
>         file or
>         directory.
>         
>         linux/module.h does reside
>         in:
>           /usr/src/linux-headers-2.6.28-13-generic/include/linux/module.h
>         
>         Without creating further errors can I: ln
>         -s /usr/src/linux-headers-2.6.28-13-generic/include/linux/module.h /linux/module.h
>         
>         Is the suggetion workable,alternately can you suggest another?
>         
>         
>         Thanks,Antonio
>         
>         
>         
>         
>         
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