__get_user9
Get a simple variable from user space, with less checking.
Usage
__get_user(x, ptr);
Arguments
x
Variable to store result.
ptr
Source address, in user space.
Context
User context only. This function may sleep.
Overview
This macro copies a single simple variable from user space to kernel 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 the result of dereferencing ptr must be assignable to x without a cast.
Caller must check the pointer with access_ok before calling this function.
Returns zero on success, or -EFAULT on error. On error, the variable x is set to zero.
Releases
2 releases since Debian 4.0 (Etch); the text changed 1 time.