__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
to
Destination 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 Kernel Hackers Manual 3.10 June 2014 __COPY_TO_USER_INATO(9)
Check Out this Related Man Page
COPY(9) BSD Kernel Developer's Manual COPY(9)NAME
copy, copyin, copyin_nofault, copyout, copyout_nofault, copystr, copyinstr -- kernel copy functions
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
int
copyin(const void *uaddr, void *kaddr, size_t len);
int
copyin_nofault(const void *uaddr, void *kaddr, size_t len);
int
copyout(const void *kaddr, void *uaddr, size_t len);
int
copyout_nofault(const void *kaddr, void *uaddr, size_t len);
int
copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done);
int
copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done);
DESCRIPTION
The copy functions are designed to copy contiguous data from one address to another. All but copystr() copy data from user-space to kernel-
space or vice-versa.
The copyin() and copyin_nofault() functions copy len bytes of data from the user-space address uaddr to the kernel-space address kaddr.
The copyout() and copyout_nofault() functions copy len bytes of data from the kernel-space address kaddr to the user-space address uaddr.
The copyin_nofault() and copyout_nofault() functions require that the kernel-space and user-space data be accessible without incurring a page
fault. The source and destination addresses must be physically mapped for read and write access, respectively, and neither the source nor
destination addresses may be pageable.
The copystr() function copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address
kdaddr. The number of bytes actually copied, including the terminating NUL, is returned in *done (if done is non-NULL).
The copyinstr() function copies a NUL-terminated string, at most len bytes long, from user-space address uaddr to kernel-space address kaddr.
The number of bytes actually copied, including the terminating NUL, is returned in *done (if done is non-NULL).
RETURN VALUES
The copy functions return 0 on success or EFAULT if a bad address is encountered. In addition, the copyin_nofault() and copyout_nofault()
functions return EFAULT if a page fault occurs, and the copystr() and copyinstr() functions return ENAMETOOLONG if the string is longer than
len bytes.
SEE ALSO fetch(9), store(9)BSD July 9, 2011 BSD
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