copyin man page on DigitalUNIX

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copyin(9r)							    copyin(9r)

NAME
       copyin  -  General:  Copies  data from a user address space to a kernel
       address space

SYNOPSIS
       int copyin(
	       caddr_t user_src,
	       caddr_t kernel_dest,
	       u_int bcount );

ARGUMENTS
       Specifies the address in user space of the data to be  copied.	Speci‐
       fies  the  address  in kernel space to copy the data to.	 Specifies the
       number of bytes to copy.

DESCRIPTION
       The copyin routine copies a specified amount of data  from  the	unpro‐
       tected user address space to the protected kernel address space.

RETURN VALUES
       Upon  successful completion, copyin returns a value of 0 (zero). Other‐
       wise, it can return the following error: The address in user space that
       you specified in the user_src argument cannot be accessed.

SEE ALSO
       Routines: copyinstr(9r), copyout(9r)

								    copyin(9r)
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