misc/sys/uio.h

   1 /* Copyright (C) 1991, 92, 96, 97, 98, 99, 2003 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_UIO_H
  20 #define _SYS_UIO_H      1
  21
  22 #include <features.h>
  23
  24 #include <sys/types.h>
  25
  26 __BEGIN_DECLS
  27
  28 /* This file defines `struct iovec'.  */
  29 #include <bits/uio.h>
  30
  31
  32 /* Read data from file descriptor FD, and put the result in the
  33    buffers described by IOVEC, 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 IOVEC instead of a contiguous buffer.
  37
  38    This function is a cancellation point and therefore not marked with
  39    __THROW.  */
  40 extern ssize_t readv (int __fd, __const struct iovec *__iovec, int __count);
  41
  42 /* Write data pointed by the buffers described by IOVEC, 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 IOVEC instead of a contiguous buffer.
  47
  48    This function is a cancellation point and therefore not marked with
  49    __THROW.  */
  50 extern ssize_t writev (int __fd, __const struct iovec *__iovec, int __count);
  51
  52 __END_DECLS
  53
  54 #endif /* sys/uio.h */