Hello all,
Follwing is procedure i follow to add new system call
to 2.4.24 kernel and want to call from it another
exported function from kernel module.
under /usr/src/linux-2.4/kernel/myservice.c
#include <linux/myservice.h>
#include <linux/errno.h>
asmlinkage int sys_myservice (char* arg1) {
return call_fun ? call_fun(arg1) : -ENOSYS;
}
where my myservice.h is
ifndef __LINUX_MYSERVICE_H
#define __LINUX_MYSERVICE_H
#include <linux/linkage.h>
#endif
extern int call_fun(char *);
call_fun(char *) is written in kernel module that i
want to include any time to kernel and get it executed
from user program
I already add syscall entry in asm/unistd.h as
#define __NR_myservice 259
Also same in user space in /usr/include/asm/unistd.h
then add entry in syscall table in
arch/i386/kernel/entry.S
also added exported function call_fun as extern in
/usr/include/sys/myservice-user.h
My new system call myservice has successfully
implemented from
http://fossil.wpi.edu/docs/howto_add_systemcall.html
now i change myservice.c given above to call exported
function which i can see from /proc/ksyms as
call_fun_R__ver_call_fun
After this when i compile kernel i got undefined
reference to call_fun.
What i forgotten to add?
I got error at /usr/src/linux-2.4/kernel/myservice.c
Thanks in advance.
regards,
linux_lover.
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