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iovec(9s) [sunos man page]

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

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 5.10 11 Apr 1991 iovec(9S)

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

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
The uiomove() function returns 0 upon success or EFAULT on failure. CONTEXT
User context only, if uio_segflg is set to UIO_USERSPACE. User, interrupt, or kernel 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 5.11 16 Jan 2006 uiomove(9F)
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