iovec(9s) [opensolaris man page]

iovec(9S)						    Data Structures for Drivers 						 iovec(9S)

NAME

       iovec - data storage structure for I/O using uio

SYNOPSIS

       #include <sys/uio.h>

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

DESCRIPTION

       An   iovec  structure  describes  a  data  storage  area for transfer in a uio(9S) structure.  Conceptually, it can be thought of as a base
       address and length specification.

STRUCTURE MEMBERS

	 caddr_t    iov_base;  /* base address of the data storage area */
			       /* represented by the iovec structure */
	 int	    iov_len;   /* size of the data storage area in bytes */

SEE ALSO

       uio(9S)

       Writing Device Drivers

SunOS 5.11							    11 Apr 1991 							 iovec(9S)

uiomove(9F)						   Kernel Functions for Drivers 					       uiomove(9F)

NAME

       uiomove - copy kernel data using uio structure

SYNOPSIS

       #include <sys/types.h>
       #include <sys/uio.h>

       int uiomove(caddr_t address, size_t nbytes, enum uio_rw rwflag, uio_t *uio_p);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       address	       Source/destination kernel address of the copy.

       nbytes	       Number of bytes to copy.

       rwflag	       Flag indicating read or write operation. Possible values are UIO_READ and UIO_WRITE.

       uio_p	       Pointer to the uio structure for the copy.

DESCRIPTION

       The uiomove() function copies nbytes of data to or from the space defined by the uio structure (described in uio(9S)) and the driver.

       The  uio_segflg	member	of the uio(9S) structure determines the type of space to or from which the transfer is being made. If it is set to
       UIO_SYSSPACE, the data transfer is between addresses in the kernel. If it is set to UIO_USERSPACE, the transfer is between a  user  program
       and kernel space.

       rwflag indicates the direction of the transfer. If UIO_READ is set, the data will be transferred from address to the buffer(s) described by
       uio_p. If UIO_WRITE is set, the data will be transferred from the buffer(s) described by uio_p to address.

       In addition to moving the data, uiomove() adds the number of bytes moved to the iov_base member of the iovec(9S) structure,  decreases  the
       iov_len member, increases the uio_offset member of the
	uio(9S) structure, and decreases the uio_resid member.

       This function automatically handles page faults. nbytes does not have to be word-aligned.

RETURN VALUES

       uiomove() returns 0 upon success or EFAULT on failure.

CONTEXT

       User context only, if uio_segflg is set to UIO_USERSPACE. User or interrupt context, if uio_segflg is set to UIO_SYSSPACE.

SEE ALSO

       ureadc(9F), uwritec(9F), iovec(9S), uio(9S)

       Writing Device Drivers

WARNINGS

       If uio_segflg is set to UIO_SYSSPACE and address is selected from user space, the system may panic.

SunOS 5.10							    7 Feb 2003							       uiomove(9F)