get_user

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Langue: en

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

Sommaire

NAME

get_user - Get a simple variable from user space.

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.

Returns zero on success, or -EFAULT on error. On error, the variable x is set to zero.