anganthia wrote:

>hey guys i am newbie and am trying to compile the famous helloworld
>program and i am using the following hello.c file and the make file
>also i have given and i am getting the following errors i am trying
>from one week pls help
>
>hello.c
>**************************************
>
>#include
>#include
>
>static int hello_init(void) /* Loads a module in the kernel */
>{
>printk(KERN_ALERT"Hello kernel\n");
>return 0;
>
>}
>
>static void hello_exit(void) /* Removes module from kernel */
>{
>printk(KERN_ALERT"GoodBye Kernel\n");
>
>}
>
>module_init(hello_init);
>module_exit(hello_exit);
>
>makefile
>****************************
>
>ifneq ($KERNELRELEASE),)
>
>obj-m :=hello.o
>
>else
>
>KERNELDIR := /lib/modules/$(shell uname -r)/build
>
>PWD := $(shell pwd)
>
>default:
>$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
>
>endif
>
>%make hello
>********************************
>cc -c -o hello.o hello.c
>hello.c:2:24: error: linux/init.h: No such file or directory
>hello.c:3:26: error: linux/module.h: No such file or directory
>hello.c: In function 'hello_init':
>hello.c:7: error: 'KERN_ALERT' undeclared (first use in this function)
>hello.c:7: error: (Each undeclared identifier is reported only once
>hello.c:7: error: for each function it appears in.)
>hello.c:7: error: expected ')' before string constant
>hello.c: In function 'hello_exit':
>hello.c:13: error: 'KERN_ALERT' undeclared (first use in this
>function)
>hello.c:13: error: expected ')' before string constant
>hello.c: At top level:
>hello.c:16: warning: data definition has no type or storage class
>hello.c:16: warning: parameter names (without types) in function
>declaration
>hello.c:17: warning: data definition has no type or storage class
>hello.c:17: warning: parameter names (without types) in function
>declaration
>make: *** [hello.o] Error 1

I don't want to confuse the issue but here is one I've been tinkering
with with some reference URL's. Don't let the "main" function confuse
you. Its not what you think.

This one (only) works with a 2.6.x kernel.

hello.c
************************************************** **************************
/* 010831 - Linux Journal Sept 2001 Pg 24 - Loadable Module Hello.c
- compile with
gcc -c -DMODULE -D__KERNEL__ hello.c
- Use with
insmod ./hello.o
lsmod
rmmod hello.o
050417 - http://tldp.org/LDP/lkmpg/2.6/html/index.html
- make -C /usr/src/linux-`uname -r` SUBDIRS=$PWD modules
- Makefile: obj-m += src_file.o
050922 - Repaired and made modern from Linux Journal Oct 2005 Pg
22.
http://www.linuxjournal.com/article/8453
060406 - Tried adding a main function ... it doesn't work exactly
as you'd think.
- Follow the ftp kernel module example to add a sys_call.
*/

#include
#include
#include

#define MYKERN "<4> " /* 1=minimum, console only; 4=kernel warning,
/var/log/messages */

int main(void) {
printk(MYKERN "I'm in the main loop now!\n");
return 0;
}

int init_module() {
int x;
printk(MYKERN "Hello, kernel!\n");
x=main();
return 0;
}

void cleanup_module() {
printk(MYKERN "I'm not offended that you "
"unloaded me. Have a pleasant day!\n");
}

MODULE_AUTHOR("Linux Journal Sept 2001 & Oct 2005.");
MODULE_LICENSE("GPL");


Makefile
************************************************** **************************
# 050922 - Very basic kernel module make file.
obj-m := hello.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)

default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
rm -f *.o *.ko *.mod.c

Output
************************************************** **************************
make -C /lib/modules/2.6.20/build
SUBDIRS=/usr/src/MySource/modules/26/hello modules
make[1]: Entering directory `/usr/src/linux-2.6.20'
CC [M] /usr/src/MySource/modules/26/hello/hello.o
Building modules, stage 2.
MODPOST 1 modules
CC /usr/src/MySource/modules/26/hello/hello.mod.o
LD [M] /usr/src/MySource/modules/26/hello/hello.ko
make[1]: Leaving directory `/usr/src/linux-2.6.20'

Good luck!



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