copy(9) - NetBSD Manual Pages

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COPY(9)                NetBSD 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 adresses when
                     the FKIOCTL flag is passed in ioctlflags from the ioctl
                     call.

     ioctl_copyout()
                     Like copyout(), except it operates on kernel adresses
                     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

     fetch(9), store(9)

NetBSD 7.1_STABLE               August 28, 2005              NetBSD 7.1_STABLE