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NetBSD 6.1.5 - man page for copyin (netbsd section 9)

COPY(9) 			  BSD 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 addi-
     tion, the copystr(), copyinstr(), and copyoutstr() functions return ENAMETOOLONG if the
     string is longer than len bytes.

SEE ALSO
     fetch(9), store(9)

BSD					 August 28, 2005				      BSD


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