COPY(9) | Kernel Developer's 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);

int
`copyin_proc`(struct proc *p, const void *uaddr, void *kaddr, size_t len);

int
`copyout_proc`(struct proc *p, const void *kaddr, void *uaddr, size_t len);

int
`ioctl_copyin`(int ioctlflags, const void *src, void *dst, size_t len);

int
`ioctl_copyout`(int ioctlflags, const void *src, void *dst, size_t len);

# 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 in the current process to the kernel-space address kaddr.
`copyout`()
  Copies len bytes of data from the kernel-space address kaddr to the user-space address uaddr in the current process.
`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 in the current process 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 in the current process. If the done argument is non-NULL, the number of bytes actually copied, including the terminating NUL, is returned in *done.
`copyin_proc`()
  Like `copyin`(), except it operates on the address space of the process p.
`copyout_proc`()
  Like `copyout`(), except it operates on the address space of the process p.
`ioctl_copyin`()
  Like `copyin`(), except it operates on kernel addresses when the `FKIOCTL` flag is passed in ioctlflags from the ioctl call.
`ioctl_copyout`()
  Like `copyout`(), except it operates on kernel addresses when the `FKIOCTL` flag is passed in ioctlflags from the ioctl call.

# RETURN VALUES

The `copy` 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.

# SEE ALSO

ufetch(9), ustore(9)

August 28, 2005 | NetBSD 9.3