Hi Ulka,
You need to add edit two more files.
Add the following in file "arch/x86/include/generated/uapi/asm/unistd_32.h":
#define __NR_helloworld 349
Add the following in "include/linux/syscalls.h" :
asmlinkage long sys_helloworld(void);
Regards,
Binoy Jayan
Mob: +91-9742870916, +91-9745783048
________________________________________
From: kernelnewbies-bounces@xxxxxxxxxxxxxxxxx [kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] on behalf of Ulka Vaze [ulka.vaze@xxxxxxxx]
Sent: Thursday, October 10, 2013 4:47 PM
To: Kernelnewbies@xxxxxxxxxxxxxxxxx
Subject: system call does not work
Hi All,
I have Implemented sample system call on tree 3.4.6
Following are the steps i did -
- >I created directory hello in kernel sources base directory i.e
/usr/src/kernels/linux3.4.6/hello
-> I have created hello.c file in which i added system call definition
#include <linux/kernel.h>
asmlinkage long sys_helloworld()
{
printk(KERN_NOTICE "\n hello system call ");
return 0;
}
In makefile
obj-y:= hello.c
In main makefile added directory in core-y
-> In syscall tabel arch/x86/syscalls/syscall_32.tbl
added -
349 i386 helloworld sys_helloworld
Then compiled the kernel and installed it.
However when i run application strace ouput shows enosys(function not
implemneted)
application as below
int main()
{
syscall(349)
return 0;
}
strace shows
SYS_349(0x1000,0x804843b,..,..,0)=-1 ENOSYS(function not implemneted)
I checked /proc/kallsyms it shows the sys_helloworld symbol
I also tried adding entry in syscall_64.tbl as common though i am
running 32 bit kernel.
gdb syscall 349 doesnot give anything
Can anyone tell what is wrong here ?
Thanks,
-Ulka
--
Director
L2IT -Learn & Leverage Information Technology
Leading Professional Training Institute in Pune
www.l2it.com
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