misc/sys/uio.h

   1 /* Copyright (C) 1991, 1992, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _SYS_UIO_H
  20
  21 #define _SYS_UIO_H      1
  22 #include <features.h>
  23
  24 #include <sys/types.h>
  25
  26 __BEGIN_DECLS
  27
  28 /* This file defines `struct iovec'.  */
  29 #include <iovec.h>
  30
  31
  32 /* Read data from file descriptor FD, and put the result in the
  33    buffers described by VECTOR, which is a vector of COUNT `struct iovec's.
  34    The buffers are filled in the order specified.
  35    Operates just like `read' (see <unistd.h>) except that data are
  36    put in VECTOR instead of a contiguous buffer.  */
  37 extern ssize_t __readv __P ((int __fd, __const struct iovec *__vector,
  38                              int __count));
  39 extern ssize_t readv __P ((int __fd, __const struct iovec *__vector,
  40                            int __count));
  41
  42 /* Write data pointed by the buffers described by VECTOR, which
  43    is a vector of COUNT `struct iovec's, to file descriptor FD.
  44    The data is written in the order specified.
  45    Operates just like `write' (see <unistd.h>) except that the data
  46    are taken from VECTOR instead of a contiguous buffer.  */
  47 extern ssize_t __writev __P ((int __fd, __const struct iovec *__vector,
  48                               int __count));
  49 extern ssize_t writev __P ((int __fd, __const struct iovec *__vector,
  50                             int __count));
  51
  52
  53 __END_DECLS
  54
  55 #endif /* sys/uio.h */