LXR linux/include/uapi/linux/uio.h

   1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2/*
   3 *      Berkeley style UIO structures   -       Alan Cox 1994.
   4 *
   5 *              This program is free software; you can redistribute it and/or
   6 *              modify it under the terms of the GNU General Public License
   7 *              as published by the Free Software Foundation; either version
   8 *              2 of the License, or (at your option) any later version.
   9 */
  10#ifndef _UAPI__LINUX_UIO_H
  11#define _UAPI__LINUX_UIO_H
  12
  13#include <linux/compiler.h>
  14#include <linux/types.h>
  15
  16
  17struct iovec
  18{
  19        void __user *iov_base;  /* BSD uses caddr_t (1003.1g requires void *) */
  20        __kernel_size_t iov_len; /* Must be size_t (1003.1g) */
  21};
  22
  23/*
  24 *      UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
  25 */
  26 
  27#define UIO_FASTIOV     8
  28#define UIO_MAXIOV      1024
  29
  30
  31#endif /* _UAPI__LINUX_UIO_H */
  32