1KFIFO_FROM_USER(9)                FIFO Buffer               KFIFO_FROM_USER(9)
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NAME

6       kfifo_from_user - puts some data from user space into the fifo
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SYNOPSIS

9       kfifo_from_user(fifo, from, len, copied);
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ARGUMENTS

12       fifo
13           address of the fifo to be used
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15       from
16           pointer to the data to be added
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18       len
19           the length of the data to be added
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21       copied
22           pointer to output variable to store the number of copied bytes
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DESCRIPTION

25       This macro copies at most len bytes from the from into the fifo,
26       depending of the available space and returns -EFAULT/0.
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28       Note that with only one concurrent reader and one concurrent writer,
29       you don't need extra locking to use these macro.
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32Kernel Hackers Manual 3.10         June 2019                KFIFO_FROM_USER(9)
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