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uio(9s)								       uio(9s)

NAME
       uio - General: Describes I/O, either single vector or multiple vectors

SYNOPSIS
       ─────────────────────────────
       Member Name   Data Type
       ─────────────────────────────
       uio_iov	     struct iovec *
       uio_iovcnt    int
       uio_offset    off_t
       uio_segflg    enum uio_seg
       uio_resid     int
       uio_rw	     enum uio_rw
       ─────────────────────────────

MEMBERS
       Specifies  a  pointer to the first iovec structure. The iovec structure
       has two members: one that specifies the	address	 of  the  segment  and
       another	that  specifies	 the size of the segment. The system allocates
       contiguous iovec structures for a given transfer.  Specifies the number
       of iovec structures for this transfer.  Specifies the offset within the
       file.  Specifies the segment type. This member can be set to one of the
       following  values:  UIO_USERSPACE  (the	segment	 is from the user data
       space), UIO_SYSSPACE  (the  segment  is	from  the  system  space),  or
       UIO_USERISPACE  (the  segment is from the user I space).	 Specifies the
       number of bytes that still need to be transferred.   Specifies  whether
       the transfer is a read or a write. This member is set by read and write
       system calls according to the corresponding field in the file  descrip‐
       tor.  This  member  can be set to one of the following values: UIO_READ
       (read transfer), UIO_WRITE (write transfer), or	UIO_AIORW  (Alpha  I/O
       read/write transfer).

DESCRIPTION
       The  uio	 data  structure describes, either singler-vector or multiple-
       vector I/O. Typically, kernel modules do not manipulate the members  of
       this  data structure. However, the data structure is presented here for
       the purpose of understanding the uiomove routine, which operates on the
       members of the uio structure.

FILES
SEE ALSO
       Routines: uiomove(9r)

								       uio(9s)

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