Linux - data transfer between kernel/user space

• put_user(x, ptr)
- Write a simple value into user space
• x - Value to copy to user space
• ptr - Destination address in user space
• get_user(x, ptr)
- Get a simple variable from user space
• x - Variable to store result
• ptr - Source address in user space
• copy_to_user(void __user *to, const void *from, unsigned long n);
- Copy a block of data into user space
• copy_from_user(void *to, const void __user *from, unsigned long n);
  - Copy a block of data from user space