hi,
I was trying to add a system call from a module. I was
trying out a sample program to do the same.
It gave me an error when i tried to insert the module
into the kernel. The error stmt was:
---snip-----
[root]# insmod testcall.o
testcall.o: init_module: Device or resource busy
Hint: insmod errors can be caused by incorrect module
parameters, including invalid IO or IRQ parameters
[root]#
---snip----
The program was :
-----snip-----
#include<linux/kernel.h>
#include<linux/module.h>
#include<linux/sys.h>
#include<sys/syscall.h>
static const char *version = "testcall.c: 7/11/2002
Karthik";
static int syscall_num = 225;
extern int sys_call_table[];
asmlinkage int sys_hello(void)
{
printk("The kernel says 'Hi'\n");
return 1;
}
int init_module(void)
{
printk(version);
if(sys_call_table[syscall_num])
{
printk("Error : %d",syscall_num);
return 1;
}
sys_call_table[syscall_num] = (int)sys_hello;
return 0;
}
void cleanup_module(void)
{
sys_call_table[syscall_num] = 0;
}
-----snip-----
The command used to compile was:
----snip----
[root]# gcc -D__KERNEL__ -DMODULE -Wall
-I/usr/src/linux/include -O2 -c te
stcall.c
----snip----
I am stuck and could'nt find a possible solution for
this problem.
TIA
karthik
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