copyin(9) - NetBSD Manual Pages

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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