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

13       fifo
14           the fifo to be used.
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16       from
17           pointer to the data to be added.
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19       len
20           the length of the data to be added.
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22       total
23           the actual returned data length.
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DESCRIPTION

26       This function copies at most len bytes from the from into the FIFO
27       depending and returns -EFAULT/0.
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29       Note that with only one concurrent reader and one concurrent writer,
30       you don't need extra locking to use these functions.
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33Kernel Hackers Manual 2.6.       November 2011              KFIFO_FROM_USER(9)
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