other versions
- jessie 3.16.56-1+deb8u1
__COPY_TO_USER_INATO(9) | Memory Management in Linux | __COPY_TO_USER_INATO(9) |
NAME¶
__copy_to_user_inatomic - Copy a block of data into user space, with less checking.SYNOPSIS¶
unsigned long
__copy_to_user_inatomic(void __user * to,
const void * from,
unsigned long n);
ARGUMENTS¶
toDestination address, in user space.
from
Source address, in kernel space.
n
Number of bytes to copy.
CONTEXT¶
User context only.DESCRIPTION¶
Copy data from kernel space to user space. Caller must check the specified block with access_ok before calling this function. The caller should also make sure he pins the user space address so that we don't result in page fault and sleep. Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a fault we return the initial request size (1, 2 or 4), as copy_*_user should do. If a store crosses a page boundary and gets a fault, the x86 will not write anything, so this is accurate.COPYRIGHT¶
May 2018 | Kernel Hackers Manual 3.16 |