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__get_user
Langue: en
Version: June 2009 (debian - 07/07/09)
Section: 9 (Appels noyau Linux)
NAME
__get_user - Get a simple variable from user space, with less checking.SYNOPSIS
- __get_user(x, ptr);
ARGUMENTS
x
- Variable to store result.
ptr
- Source address, in user space.
CONTEXT
User context only. This function may sleep.
DESCRIPTION
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.
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