Provided by: linux-doc-2.6.15_2.6.15-23.39_all
put_user - Write a simple value into user space.
put_user (x, ptr);
x Value to copy to user space.
ptr Destination address, in user space.
User context only. This function may sleep.
This macro copies a single simple value from kernel space to user
space. It supports simple types like char and int, but not larger data
types like structures or arrays.
ptr must have pointer-to-simple-variable type, and x must be
assignable to the result of dereferencing ptr.
Returns zero on success, or -EFAULT on error.