sysdeps/posix/preadv2.c

   1 /* Generic version of preadv2.
   2    Copyright (C) 2017-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <sys/uio.h>
  22
  23 #ifndef __OFF_T_MATCHES_OFF64_T
  24
  25 /* Since we define no flags for preadv2 just route to preadv.  */
  26 ssize_t
  27 preadv2 (int fd, const struct iovec *vector, int count, off_t offset,
  28          int flags)
  29 {
  30   if (flags != 0)
  31     {
  32       __set_errno (ENOTSUP);
  33       return -1;
  34     }
  35
  36   if (offset == -1)
  37     return __readv (fd, vector, count);
  38   else
  39     return preadv (fd, vector, count, offset);
  40 }
  41
  42 #endif