copyin(9)
- NetBSD Manual Pages
COPY(9) NetBSD Kernel Manual COPY(9)
NAME
copy, copyin, copyout, copystr, copyinstr, copyoutstr - kernel space
to/from user space copy functions
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
int
copyin(const void *uaddr, void *kaddr, size_t len);
int
copyout(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);
int
copyoutstr(const void *kaddr, void *uaddr, 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 copy routines provide the following functionality:
copyin() Copies len bytes of data from the user-space address uaddr
to the kernel-space address kaddr.
copyout() Copies len bytes of data from the kernel-space address
kaddr to the user-space address uaddr.
copystr() Copies a NUL-terminated string, at most len bytes long,
from kernel-space address kfaddr to kernel-space address
kdaddr. If the done argument is non-NULL, the number of
bytes actually copied, including the terminating NUL, is
returned in *done.
copyinstr() Copies a NUL-terminated string, at most len bytes long,
from user-space address uaddr to kernel-space address
kaddr. If the done argument is non-NULL, the number of
bytes actually copied, including the terminating NUL, is
returned in *done.
copyoutstr() Copies a NUL-terminated string, at most len bytes long,
from kernel-space address kaddr to user-space address
uaddr. If the done argument is non-NULL, the number of
bytes actually copied, including the terminating NUL, is
returned in *done.
RETURN VALUES
The copy functions return 0 on success or EFAULT if a bad address is en-
countered. In addition, the copystr(), copyinstr(), and copyoutstr()
functions return ENAMETOOLONG if the string is longer than len bytes.
SEE ALSO
fetch(9), store(9)
NetBSD 1.6 February 22, 1998 1
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