adding system call in linux
 

Hi,
i am working on implementation of system call, where i tried to
implement a system call in which i made the following changes in
the code:

1. In file /usr/src/linux/fs

a) Makefile :
I added O_OBJS += myservice.o

b) myservice.c
wrote a function :
#include <linux/myservice.h>
asmlinkage int sys_myservice(unsigned int arg1)
{
printk("/n i m in my service");
return(1);
}

2. In file /usr/src/linux/include/asm
unistd.h
.long SYMBOL_NAME(sys_myservice) /*191*/

3. In file /usr/src/linux/arch/i386/kernel
entry.S
#define __NR_myservice 191

4. In file /usr/src/linux/include/linux
myservice.h
#ifndef __LINUX_MYSERVICE_H
#define __LINUX_MYSERVICE_H

#include <linux/unistd.h>
#include <linux/linkage.h>
#include<linux/kernel.h>
_syscall2(int, myservice, int, arg1);
#endif

after compiling and rebooting i got the following errors during
rebooting
1. system logger --- failed
2. NFS lockd ------ failed

also when i tried to run this system call, i got the following
error:

/tmp/ccMK9qPM.o :In function 'main':
/tmp/ccMK9qPM.o(text+0xc):undefined reference to 'secclose'
collect2 :Id returned 1 exit status.


I saw that you are also working on system calls . Might be we
can
be of help to each other. We can discuss the particular problem.
regards and thanx in advance
Udayan

Hi udayan,

I've just read the e-mail you've sent to me, but I don't have any solution to your problem ! In fact, I'm not a "kernel hacker" :-)

Regards

Gluon