1COPY_FROM_USER(9)         Memory Management in Linux         COPY_FROM_USER(9)
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NAME

6       copy_from_user - Copy a block of data from user space.
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SYNOPSIS

9       unsigned long copy_from_user(void * to, const void __user * from,
10                                    unsigned long n);
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ARGUMENTS

13       to
14           Destination address, in kernel space.
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16       from
17           Source address, in user space.
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19       n
20           Number of bytes to copy.
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CONTEXT

23       User context only. This function may sleep.
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DESCRIPTION

26       Copy data from user space to kernel space.
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28       Returns number of bytes that could not be copied. On success, this will
29       be zero.
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31       If some data could not be copied, this function will pad the copied
32       data to the requested size using zero bytes.
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35Kernel Hackers Manual 2.6.         June 2019                 COPY_FROM_USER(9)
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