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Old 04-17-2006, 06:34 AM   #1
bhushanv
LQ Newbie
 
Registered: Mar 2006
Posts: 2

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unable to add own system call to red hat 9


Hi all,
i m trying to add a new system call in linux(red hat 9) kernel-2.4
following are the files for this

1.myroutine.c :this is saved in /usr/src/linux2.4/fs
code written in this file is:
#include <linux/myroutine.h>

asmlinkage int sys_myroutine(int arg1,int arg2){

return arg1+arg2;

}

i have changed in makefile
obj-y +=myroutine.o

2.myroutine.h :this is saved in /usr/src/linux2.4/include/linux/
code written in this file is:

#ifndef __LINUX_MYROUTINE_H

#define __LINUX_MYROUTINE_H


#include <linux/linkage.h>

#endif




3.myroutine.h :this is saved in /usr/include/sys/
code written in this file is:

#include <linux/unistd.h>

_syscall2(int, myroutine, int, arg1, int , arg2);



now i add one line in /usr/src/linux2.4/arch/i386/kernel/entry.S

.long SYMBOL_NAME(sys_myroutine)


add one lin in /usr/src/linux2.4/include/asm/unistd.h
#define __NR_myroutine 260



now i recompile the kernel,i got success in compiling kernel,then i reboot the system and run new kernel
nnow i write a program (myappl.c) to use this system call

myappl.c:this is saved in /usr/src/linux2.4/fs

code written in this file is:

include<linux/myroutine.h>

int main()

{

int sum;
sum = myroutine(10,10);
printf("%d",sum);
}


this runs in user mode to get the sum of two number using system call myroutine

but i got an error while compling this program.the error is

/tmp/ccOqqTMU.o(.text+0x18): In function `main':
: undefined reference to `myroutine'
collect2: ld returned 1 exit status

cold anybody please tell me what is the actual problem and where is this
Thanks & Regards
 
  


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