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kernel/linux-imx6_3.14.28/include/uapi/linux/uio.h 717 Bytes
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  /*
   *	Berkeley style UIO structures	-	Alan Cox 1994.
   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   */
  #ifndef _UAPI__LINUX_UIO_H
  #define _UAPI__LINUX_UIO_H
  
  #include <linux/compiler.h>
  #include <linux/types.h>
  
  
  struct iovec
  {
  	void __user *iov_base;	/* BSD uses caddr_t (1003.1g requires void *) */
  	__kernel_size_t iov_len; /* Must be size_t (1003.1g) */
  };
  
  /*
   *	UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
   */
   
  #define UIO_FASTIOV	8
  #define UIO_MAXIOV	1024
  
  
  #endif /* _UAPI__LINUX_UIO_H */