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COPYIN(9) Kernel Developer's Manual COPYIN(9)

NAME

copyin, copyout, copystr, copyinstr, copyoutstr, kcopykernel 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);
int
kcopy(const void *kfaddr, void *kdaddr, size_t len);

DESCRIPTION

The copyin functions are designed to copy contiguous data from one address to another. All but copystr() and kcopy() copy data from user-space to kernel-space or vice-versa.
The copyin 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 null-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 null, is returned in *done, if done is not NULL.
Unlike the other copyin functions, copystr() does not support returning EFAULT when a bad address is encountered.
 
 
copyinstr()
Copies a null-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 null, is returned in *done, if done is not NULL.
 
 
copyoutstr()
Copies a null-terminated string, at most len bytes long, from kernel-space address kaddr to user-space address uaddr. The number of bytes actually copied, including the terminating null, is returned in *done, if done is not NULL.
 
 
kcopy()
Copies len bytes of data from the kernel-space address kfaddr to the kernel-space address kdaddr.

RETURN VALUES

The copyin functions return 0 on success or EFAULT if a bad address is encountered. In addition, the copystr(), copyinstr(), and copyoutstr() functions return ENAMETOOLONG if the string is longer than len bytes.
November 23, 2015 OpenBSD-5.9