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)
