1KFIFO_FROM_USER_REC(9)            FIFO Buffer           KFIFO_FROM_USER_REC(9)
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NAME

6       kfifo_from_user_rec - puts some data from user space into the FIFO
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SYNOPSIS

9       __must_check unsigned int kfifo_from_user_rec(struct kfifo * fifo,
10                                                     const void __user * from,
11                                                     unsigned int n,
12                                                     unsigned int recsize);
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ARGUMENTS

15       fifo
16           the fifo to be used.
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18       from
19           pointer to the data to be added.
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21       n
22           the length of the data to be added.
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24       recsize
25           size of record field
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DESCRIPTION

28       This function copies n bytes from the from into the FIFO and returns
29       the number of bytes which cannot be copied.
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31       If the returned value is equal or less the n value, the copy_from_user
32       functions has failed. Otherwise the record doesn't fit into the buffer.
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34       Note that with only one concurrent reader and one concurrent writer,
35       you don't need extra locking to use these functions.
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38Kernel Hackers Manual 2.6.       November 2011          KFIFO_FROM_USER_REC(9)
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