KFIFO_TO_USER_REC(9) FIFO Buffer KFIFO_TO_USER_REC(9)
NAME
kfifo_to_user_rec - gets data from the FIFO and write it to user space
SYNOPSIS
__must_check unsigned int kfifo_to_user_rec(struct kfifo * fifo, void __user * to, unsigned int n, unsigned int recsize,
unsigned int * total);
ARGUMENTS
fifo
the fifo to be used.
to
where the data must be copied.
n
the size of the destination buffer.
recsize
size of record field
total
pointer where the total number of to copied bytes should stored
DESCRIPTION
This function copies at most n bytes from the FIFO to the to. In case of an error, the function returns the number of bytes which cannot be
copied. If the returned value is equal or less the n value, the copy_to_user functions has failed. Otherwise the record doesn't fit into
the to buffer.
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_TO_USER_REC(9)
