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Name

Synopsis

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

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

Interface Level

Architecture independent level 1 (DDI/DKI).

Arguments

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 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

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

Warnings

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

Table of Contents

• Name
• Synopsis
• Interface Level
• Arguments
• Description
• Return Values
• Context
• See Also
• Warnings