blob: 87f916d714ddf70fa5e337adf9b6d8a5778e7b9e [file] [log] [blame]
/* Copyright (C) 1996, 1997, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#if !defined _SYS_UIO_H && !defined _FCNTL_H
# error "Never include <bits/uio.h> directly; use <sys/uio.h> instead."
#ifndef _BITS_UIO_H
#define _BITS_UIO_H 1
#include <sys/types.h>
/* We should normally use the Linux kernel header file to define this
type and macros but this calls for trouble because of the header
includes other kernel headers. */
/* Size of object which can be written atomically.
This macro has different values in different kernel versions. The
latest versions of the kernel use 1024 and this is good choice. Since
the C library implementation of readv/writev is able to emulate the
functionality even if the currently running kernel does not support
this large value the readv/writev call will not fail because of this. */
#define UIO_MAXIOV 1024
#define UIO_FASTIOV 8
/* Structure for scatter/gather I/O. */
struct iovec
void *iov_base; /* Pointer to data. */
size_t iov_len; /* Length of data. */