sysdeps/mach/hurd/pread64.c

   1 /* Read block from given position in file without changing file pointer.
   2    Hurd version.
   3    Copyright (C) 2001,02 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <hurd/fd.h>
  24
  25 ssize_t
  26 __libc_pread64 (int fd, void *buf, size_t nbytes, off64_t offset)
  27 {
  28   error_t err;
  29   if (offset < 0)
  30     err = EINVAL;
  31   else
  32     err = HURD_FD_USE (fd, _hurd_fd_read (descriptor, buf, &nbytes, offset));
  33   return err ? __hurd_dfail (fd, err) : nbytes;
  34 }
  35
  36 #ifndef __libc_pread64
  37 weak_alias (__libc_pread64, __pread64)
  38 weak_alias (__libc_pread64, pread64)
  39 #endif