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Old 04-09-2006, 01:56 PM   #1
kesher
LQ Newbie
 
Registered: Apr 2006
Posts: 5

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Undefined errno reference while compiling loadable module


I think I'm gonna kill myself. This is so stupid... Of course I've looked for a solution all over the net and beyond. No luck, except for the fact that it could be somehow related to linux/unistd.h. I've modified such file and no luck again.

I make NO USE of errno in my code.


Here is my Makefile:


Quote:
o
Code:
bj-m += deiso.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

Here is the make output:



Quote:
Code:
make -C /lib/modules/2.6.12-9-386/build M=/home/kesher/proyectos/deiso modules
make[1]: Entering directory `/usr/src/linux-headers-2.6.12-9-386'
CC [M] /home/kesher/proyectos/deiso/deiso.o
Building modules, stage 2.
MODPOST
*** Warning: "errno" [/home/kesher/proyectos/deiso/deiso.ko] undefined!
CC /home/kesher/proyectos/deiso/deiso.mod.o
LD [M] /home/kesher/proyectos/deiso/deiso.ko
make[1]: Leaving directory `/usr/src/linux-headers-2.6.12-9-386'



And of course insmod refuses to load deiso.ko because of the undefined reference.

Any help appreciated

THANKS
 
Old 04-09-2006, 02:50 PM   #2
foo_bar_foo
Senior Member
 
Registered: Jun 2004
Posts: 2,553

Rep: Reputation: 51
try
#include <errno.h>
 
Old 04-09-2006, 02:53 PM   #3
kesher
LQ Newbie
 
Registered: Apr 2006
Posts: 5

Original Poster
Rep: Reputation: 0
Quote:
Originally Posted by foo_bar_foo
try
#include <errno.h>
I have included linux/errno.h (but I don't use it), and it doesn't work. I can't include userspace libraries in a module, anyway.
 
Old 04-10-2006, 01:22 AM   #4
foo_bar_foo
Senior Member
 
Registered: Jun 2004
Posts: 2,553

Rep: Reputation: 51
yea you are right it should be <linux/errno.h>
please forgive as i bat about more non helpfull things
but the real thing that bothers me is
Code:
Entering directory `/usr/src/linux-headers-2.6.12-9-386'
might be a distribution thing but
the only thing i know with the word headers in it is
userspace Linux-Libc-Headers
/lib/modules/`uname -r` needs to be the actual directory used to compile your currently running kernel
almost always just named linux-x.y.x unless you changed its name for some reason
 
  


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