Hi, new here, and having trouble with hello.c compliling.
I am using Fedora Core 2, and I am trying to compile hello.c in chapter 18 of the book Beginning Linux Programming 3rd edition!

Thanks for the great book. Hope to be on this site to pick more brains!

Here is the output from the screen. I modified the directories to work with my setup, only where the h files are located.

Thanks for the help.

[root@PositekVoice hfc]# gcc -D__KERNEL__ -I/usr/src/linux-2.6.5-1.358/include/linux -DMODULE -Wall -O2 -c hello.c -o hello.o
In file included from /usr/src/linux-2.6.5-1.358/include/linux/module.h:9,
                 from hello.c:4:
/usr/include/linux/config.h:5:2: #error Incorrectly using glibc headers for a kernel module
In file included from /usr/include/linux/sched.h:14,
                 from /usr/src/linux-2.6.5-1.358/include/linux/module.h:10,
                 from hello.c:4:
/usr/include/linux/timex.h:148: error: field `time' has incomplete type
In file included from /usr/include/linux/signal.h:4,
                 from /usr/include/linux/sched.h:25,
                 from /usr/src/linux-2.6.5-1.358/include/linux/module.h:10,
                 from hello.c:4:
/usr/include/asm/signal.h:107: error: syntax error before "sigset_t"
/usr/include/asm/signal.h:110: error: syntax error before '}' token
In file included from hello.c:4:
/usr/src/linux-2.6.5-1.358/include/linux/module.h:15:25: linux/cache.h: No such file or directory
/usr/src/linux-2.6.5-1.358/include/linux/module.h:16:24: linux/kmod.h: No such file or directory
/usr/src/linux-2.6.5-1.358/include/linux/module.h:18:29: linux/stringify.h: No such file or directory
/usr/src/linux-2.6.5-1.358/include/linux/module.h:19:23: asm/local.h: No such file or directory
In file included from /usr/src/linux-2.6.5-1.358/include/linux/module.h:21,
                 from hello.c:4:
/usr/include/asm/module.h:4:2: warning: #warning Using kernel headers in userspace!
In file included from hello.c:4:
/usr/src/linux-2.6.5-1.358/include/linux/module.h:500: error: syntax error before "MOD_INC_USE_COUNT"
/usr/src/linux-2.6.5-1.358/include/linux/module.h:501: warning: return type defaults to `int'
/usr/src/linux-2.6.5-1.358/include/linux/module.h:512: error: syntax error before "MOD_DEC_USE_COUNT"
/usr/src/linux-2.6.5-1.358/include/linux/module.h:513: warning: return type defaults to `int'
hello.c: In function `init_module':
hello.c:19: warning: implicit declaration of function `printk'
hello.c:19: error: `KERN_DEBUG' undeclared (first use in this function)
hello.c:19: error: (Each undeclared identifier is reported only once
hello.c:19: error: for each function it appears in.)
hello.c:19: error: syntax error before string constant
hello.c: In function `cleanup_module':
hello.c:25: error: `KERN_DEBUG' undeclared (first use in this function)
hello.c:25: error: syntax error before string constant
[root@PositekVoice hfc]# cat hello.c

Hi,

Finaly got module to compile. Major changes to the way that Linux compiles modules came out around Linux 2.5.

Thanks.:D

Hi, I'm just starting Linux programming at school, and I'm having a very similar problem at home.

I have a hello.c program that is
--------------------------------------------------
#include <linux/module.h>
#include <linux/kernel.h>

int init_module(void){
  printk(KERN_INFO "Hello World!\n");
  return 0;
}

void cleanup_module(void){
  printk(KERN_INFO "Goodbye\n");
}
--------------------------------------------------
I have a Makefile that is:

CC=gcc

CFLAGS = -D__KERNEL__ -DMODULE -02

hello.o: hello.c
        ${CC} ${CFLAGS} -c hello.c

myzero_nrw.o: myzero_nrw.c
        ${CC} ${CFLAGS} -c myzero_nrw.c
        #insmod myzero_nrw.o to turn it on
        #rmmod myzero_nrw.o to turn it off

bufdev.o: bufdev.c
        ${CC} ${CFLAGS} -c bufdev.c
        #insmod bufdev.o to turn it on
        #rmmod bufdev to trun it off

seriali.o: seriali.c
        ${CC} ${CFLAGS} -c seriali.c
        #insmod seriali.o major=num to turn it on
        #rmmod seriali to trun it off

clean:
        rm -f *.o a.out core
-----------------------------------------------
and the error I'm getting is this:

[root@localhost ass1]# make hello.o
gcc -D__KERNEL__ -DMODULE -02 -c hello.c
gcc: unrecognized option '-02'
In file included from /usr/include/linux/module.h:10,
                 from hello.c:1:
/usr/include/linux/config.h:5:2: error: #error Incorrectly using glibc headers for a kernel module
hello.c: In function ‘init_module’:
hello.c:5: error: ‘KERN_INFO’ undeclared (first use in this function)
hello.c:5: error: (Each undeclared identifier is reported only once
hello.c:5: error: for each function it appears in.)
hello.c:5: error: syntax error before string constant
hello.c: In function ‘cleanup_module’:
hello.c:10: error: ‘KERN_INFO’ undeclared (first use in this function)
hello.c:10: error: syntax error before string constant
make: *** [hello.o] Error 1
[root@localhost ass1]#



any ideas on how to fix this would be greatly appreciated. Thanks

I'm running Linux 2.6.11-1.1369_FC4 #1 Thu Jun 2 22:55:56 EDT 2005 i686 i686 i386 GNU/Linux

Were you able to come to a resolution on this as I am now encountering the same error