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NAME

     copy, copyin, copyout, 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
     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);

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.  The number of bytes actually copied, including the
                   terminating NUL, is returned in *done (if done is
                   non-NULL).

     copyinstr()   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 copystr(), and copyinstr() functions
     return ENAMETOOLONG if the string is longer than len bytes.

SEE ALSO

     fetch(9), store(9)