suse man page for kfifo_from_user

KFIFO_FROM_USER(9)						    FIFO Buffer 						KFIFO_FROM_USER(9)

NAME
       kfifo_from_user - puts some data from user space into the FIFO

SYNOPSIS
       int kfifo_from_user(struct kfifo * fifo, const void __user * from, unsigned int len, unsigned * total);

ARGUMENTS
       fifo
	   the fifo to be used.

       from
	   pointer to the data to be added.

       len
	   the length of the data to be added.

       total
	   the actual returned data length.

DESCRIPTION
       This function copies at most len bytes from the from into the FIFO depending and returns -EFAULT/0.

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

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							KFIFO_FROM_USER(9)