Index for Section 9s

Alphabetical listing for U

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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
  uio_iov
      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.

  uio_iovcnt
      Specifies the number of iovec structures for this transfer.

  uio_offset
      Specifies the offset within the file.

  uio_segflg
      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).

  uio_resid
      Specifies the number of bytes that still need to be transferred.

  uio_rw
      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 descriptor. 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
  <sys/uio.h>

SEE ALSO
  Routines: uiomove(9r)

Index for Section 9s

Alphabetical listing for U

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