Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

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.