The Linux Kernel API
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__copy_from_user

Name

__copy_from_user --  Copy a block of data from user space, with less checking.

Synopsis

__copy_from_user ( to, from, n);

Arguments

to

Destination address, in kernel space.

from

Source address, in user space.

n

Number of bytes to copy.

Context

User context only. This function may sleep.

Description

Copy data from user space to kernel space. Caller must check the specified block with access_ok before calling this function.

Returns number of bytes that could not be copied. On success, this will be zero.

If some data could not be copied, this function will pad the copied data to the requested size using zero bytes.

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