Problems in Adding new syscalls to Kernel

[redlar]

hello all,
these days I'm doing my homework which is the same to :

http://www.justlinux.com/forum/showthread.php?s=&postid=734635#post734635

I use RedHat 8 (Kernel 2.4.18-14)

that is adding 4 new kernel func() and syscalls to the kernel, I found the page above and that really helpful, but there still are some problems:

firstly In/usr/src/linux-2.4/include/linux/wait.h, I added

struct evnt_queue
{
struct evnt_queue *next_event;
wait_queue_head_t waitq;
int eid;
};

then added SYMBOL_NAME and the syscall Numbers to
/usr/src/linux-2.4.18-14/arch/i386/kernel/entry.S
&
/usr/src/linux-2.4.18-14/include/asm-i386/unistd.h

that's simple.
and in /usr/src/linux-2.4/init/main.c,added:

struct evnt_queue *eq;

static void __init event_init(void)
{
eq=(struct evnt_queue *)kmalloc(
sizeof(struct evnt_queue), GFP_KERNEL);
eq->next_event=NULL;
eq->eid=0;
init_waitqueue_head(&(eq->waitq));
}
asmlinkage void __init start_kernel(void)
{
......
event_init(); /* added as the last statement */
}

In /usr/src/linux/kernel/sys.c , added kernel func():

asmlinkage int sys_eventopen(int eid)
{
int newid=-1;
struct event_queue *temp;

printk("sys_eventopen");
if (eq==NULL)
{
eq=(struct event_queue *)kmalloc(
sizeof(struct event_queue), GFP_KERNEL);
eq->next_event=NULL;
eq->eid=0;
init_waitqueue_head(&(eq->waitq));
}

temp=eq->next_event;
if (eid>0)
{
while ((temp!=NULL)&&(temp->eid!=eid))
{
temp=temp->next_event;
}
if ((temp!=NULL)&&(temp->eid==eid)) newid=eid;
}
else if (eid==0)
{
while (temp!=NULL)
{
if (newid<temp->eid) newid=temp->eid;
temp=temp->next_event;
}
newid++;
if (newid<1) newid=1;
temp=(struct event_queue *)kmalloc(
sizeof(struct event_queue), GFP_KERNEL);
if (temp==NULL) newid=-1;
else
{
temp->eid=newid;
temp->next_event=eq->next_event;
eq->next_event=temp;
init_waitqueue_head(&(temp->waitq));
}
}

return(newid);
}

......
......
......

When "make bzImage", It stops at : 'eq' undeclared (when generating sys.o)
How should I do ...?

I'm sorry for being so verbose, and I'm really a rookie to the kernel programming

Thank you for any HELP !

[bwkaz]

Maybe you should ask whoever assigned you this homework? That way you can get help, while still learning what you need to for the course you're in.

(Sigh. Yet ANOTHER person asking us to do their homework for them! We really need to add this to the AUP or the posting guidelines.)