KFIFO_FROM_USER(9)                         FIFO Buffer                         KFIFO_FROM_USER(9)



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

SYNOPSIS
       kfifo_from_user(fifo, from, len, copied);

ARGUMENTS
       fifo
           address of the fifo to be used

       from
           pointer to the data to be added

       len
           the length of the data to be added

       copied
           pointer to output variable to store the number of copied bytes

DESCRIPTION
       This macro copies at most len bytes from the from into the fifo, depending of the
       available space and returns -EFAULT/0.

       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 4.8.                 January 2017                        KFIFO_FROM_USER(9)