kfifo_len(9) centos man page | unix.com

KFIFO_LEN(9)							    FIFO Buffer 						      KFIFO_LEN(9)

NAME
       kfifo_len - returns the number of used elements in the fifo

SYNOPSIS
       kfifo_len(fifo);

ARGUMENTS
       fifo
	   address of the fifo to be used

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							      KFIFO_LEN(9)