kfifo_peek(9) centos man page | unix.com

KFIFO_PEEK(9)							    FIFO Buffer 						     KFIFO_PEEK(9)

NAME
       kfifo_peek - get data from the fifo without removing

SYNOPSIS
       kfifo_peek(fifo, val);

ARGUMENTS
       fifo
	   address of the fifo to be used

       val
	   the var where to store the data to be added

DESCRIPTION
       This reads the data from the fifo without removing it from the fifo. It returns 0 if the fifo was empty. Otherwise it returns the number
       processed elements.

       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_PEEK(9)