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__strncpy_from_user - Copy a NUL terminated string from userspace, with
long __strncpy_from_user (char * dst, const char __user * src,
dst Destination address, in kernel space. This buffer must be at
least count bytes long.
src Source address, in user space.
count Maximum number of bytes to copy, including the trailing NUL.
Copies a NUL-terminated string from userspace to kernel space. Caller
must check the specified block with access_ok before calling this
On success, returns the length of the string (not including the
If access to userspace fails, returns -EFAULT (some data may have been
If count is smaller than the length of the string, copies count bytes
and returns count.