>
> And the K&R book on C does successive trimming of an strcpy(),
> and finishes with
>
> void strcpy(char *a, *b) { while (*a++ = *b++); }
>
> The thing that's actually used a lot in the Linux kernel that gives
> a lot of C newcomers heartburn is the widespread use of
> structures of function pointers.. For example, this from include/linux/fs.h:
>
> struct lock_manager_operations {
> int (*lm_compare_owner)(struct file_lock *, struct file_lock *);
> unsigned long (*lm_owner_key)(struct file_lock *);
> fl_owner_t (*lm_get_owner)(fl_owner_t);
> void (*lm_put_owner)(fl_owner_t);
> void (*lm_notify)(struct file_lock *); /* unblock callback */
> int (*lm_grant)(struct file_lock *, int);
> bool (*lm_break)(struct file_lock *);
> int (*lm_change)(struct file_lock *, int, struct list_head *);
> void (*lm_setup)(struct file_lock *, void **);
> };
>
> That's the structure definition. Novice challenge: Find one or more places
> where this structure is initialized, and understand how and why that works.
That kind of stuff is not taught in C programming. An answer can be
very educating.
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