Ubuntu manuals

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NAME

       __copy_from_user_inatomic  - Copy a block of data from user space, with
       less checking.

SYNOPSIS

       unsigned long __copy_from_user_inatomic  (void * to,
                                                   const void __user * from,
                                                   unsigned long n);

ARGUMENTS

       to     Destination address, in kernel space.

       from   Source address, in user space.

       n      Number of bytes to copy.

CONTEXT

       User context only. This function may sleep.

DESCRIPTION

       Copy data from user space  to  kernel  space.  Caller  must  check  the
       specified block with access_ok before calling this function.

       Returns number of bytes that could not be copied. On success, this will
       be zero.

       If some data could not be copied, this function  will  pad  the  copied
       data to the requested size using zero bytes.