sysdeps/mach/hurd/pread64.c

   1 /* Read block from given position in file without changing file pointer.
   2    Hurd version.
   3    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd/fd.h>
  23
  24 ssize_t
  25 __libc_pread64 (int fd, void *buf, size_t nbytes, off64_t offset)
  26 {
  27   error_t err;
  28   if (offset < 0)
  29     err = EINVAL;
  30   else
  31     err = HURD_FD_USE (fd, _hurd_fd_read (descriptor, buf, &nbytes, offset));
  32   return err ? __hurd_dfail (fd, err) : nbytes;
  33 }
  34
  35 #ifndef __libc_pread64
  36 weak_alias (__libc_pread64, __pread64)
  37 weak_alias (__libc_pread64, pread64)
  38 #endif