Hi Panthini,
You are trying to build executable instead of module, so you are
getting error about main function. Modules are object files they are
not executable.
Read module building from ->
1. writing Linux device drivers - rubini
(http://lwn.net/Kernel/LDD3/) 3rd edition is for 2.6 kernel
(http://www.xml.com/ldd/chapter/book/) 2nd edition is for 2.4 kernel
2. Linux kernel Module Programming Guide
(http://www.tldp.org/LDP/lkmpg/2.6/html/index.html) 2.6 kernel
(http://www.tldp.org/LDP/lkmpg/2.4/html/index.html) 2.4 Kernel
Regards,
Ameya.
On 9/23/05, Panthini <panthini.pandit@xxxxxxxxxxxxxx> wrote:
> Hi All,
> I am new to linux.
> I have written a small kernel module, which is having only 'printk' in
> init_module and cleanup_module.
> Configuration: RHEL 3- Linux kernel 2.4.21-27.EL
> snippet:
> /*************************************/
> #include <linux/kernel.h>
> #include <linux/module.h>
> int init_module()
> {
> printk("<1>Hello\n");
> return 0;
> }
> void cleanup_module()
> {
> printk("<1>bye\n");
> }
> /**************************************/
> Following is the screenshot of compilation process:
> [root@localhost root]# gcc -Wall -O2 -D__KERNEL__ -DMODULE
> -I/usr/src/linux-2.4.21-27.EL/include/ hello.c
>
> /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/../../../crt1.o(.text+0x18):
> In function `_start':
> : undefined reference to `main'
> collect2: ld returned 1 exit status
> [root@localhost root]#
> /***************************************/
> why this is referring to 'main' even though I have not written any
> main() function in hello.c.
> I could not figure out the problem.
>
> I will be thankful for your valuable suggestions.
>
> Thanks,
> Panthini
>
>
> --
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> Archive: http://mail.nl.linux.org/kernelnewbies/
> FAQ: http://kernelnewbies.org/faq/
>
>
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