centos man page for kfifo_to_user

KFIFO_TO_USER(9)						    FIFO Buffer 						  KFIFO_TO_USER(9)

NAME
       kfifo_to_user - copies data from the fifo into user space

SYNOPSIS
       kfifo_to_user(fifo, to, len, copied);

ARGUMENTS
       fifo
	   address of the fifo to be used

       to
	   where the data must be copied

       len
	   the size of the destination buffer

       copied
	   pointer to output variable to store the number of copied bytes

DESCRIPTION
       This macro copies at most len bytes from the fifo into the to buffer and returns -EFAULT/0.

       Note that with only one concurrent reader and one concurrent writer, you don't need extra locking to use these macro.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  KFIFO_TO_USER(9)