other versions
- jessie 3.16.56-1+deb8u1
_COPY_FROM_USER(9) | Memory Management in Linux | _COPY_FROM_USER(9) |
NAME¶
_copy_from_user - Copy a block of data from user space.SYNOPSIS¶
unsigned long
_copy_from_user(void * to,
const void __user * from,
unsigned n);
ARGUMENTS¶
toDestination 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. 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.COPYRIGHT¶
May 2018 | Kernel Hackers Manual 3.16 |