These are the functions that enable generic linked list implementation.
list_entry will return a pointer to the structure which encapsulates the list_head pointer passed as an arg. In short, it extracts the address of the structure which encapsulates a fied of it.
As an example, here is a simple code snippet
struct mylist {
int num;
struct list_head p;
};
};
You can use list_entry(ty,struct mylist,p);
where ty is actually pointer to list_head(address of the member p which is encapsulated in the structure). This functions allow for a generic list implementation since all list manipulation can be done via list_head pointers.
list_for_each allow you to iterate over the list taking a pointer(list_head) to the head of the list and
the pointer of list_head which hold each member as you iterate through the list. As an example(continuing with prev snippets),
the pointer of list_head which hold each member as you iterate through the list. As an example(continuing with prev snippets),
/* Iterates through the list and the prints the data in it. */
struct mylist *myl;
struct list_head *entry;
list_for_each(entry,&headnode){
myl = list_head(entry,struct mylist,p);
printk("\n %d",myl->num);
}
Thayumanavar
On 9/2/05, raja <vnagaraju@xxxxxxxxxxxx> wrote:
Hi,
Will you please help me.What are the functions
list_entry(),list_for_each() refers to?And wht are the arguments that
are to be passed to?
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
