include/linux/uio.h

   1 #ifndef __LINUX_UIO_H
   2 #define __LINUX_UIO_H
   3
   4 #include <linux/types.h>
   5
   6 /*
   7  *      Berkeley style UIO structures   -       Alan Cox 1994.
   8  *
   9  *              This program is free software; you can redistribute it and/or
  10  *              modify it under the terms of the GNU General Public License
  11  *              as published by the Free Software Foundation; either version
  12  *              2 of the License, or (at your option) any later version.
  13  */
  14
  15
  16 /* A word of warning: Our uio structure will clash with the C library one (which is now obsolete). Remove the C
  17    library one from sys/uio.h if you have a very old library set */
  18
  19 struct iovec
  20 {
  21         void *iov_base;         /* BSD uses caddr_t (1003.1g requires void *) */
  22         __kernel_size_t iov_len; /* Must be size_t (1003.1g) */
  23 };
  24
  25 /*
  26  *      UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
  27  */
  28
  29 #define UIO_FASTIOV     8
  30 #define UIO_MAXIOV      1024
  31 #if 0
  32 #define UIO_MAXIOV      16      /* Maximum iovec's in one operation
  33                                    16 matches BSD */
  34                                 /* Beg pardon: BSD has 1024 --ANK */
  35 #endif
  36
  37 #endif